Trane Variable Frequency Drives Troubleshooting

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! D A N G E R Touching the electrical parts may be fatal — even after the equipment has been disconnected from the AC line. To be sure that the capacitors have fully discharged, wait 14 minutes after power has been removed before touching any internal component!

BASIC INFORMATION AND REQUIRED EQUIPMENT

• • • • • •

REQUIRED REFERENCE MATERIAL REQUIRED TOOLS POSSIBLE USEFUL EQUIPMENT WHAT IS TROUBLESHOOTING DIVIDE AND CONQUER PHYSICAL INSPECTION

Required Reference Material YOU MUST HAVE THIS!

• INSTALLATION, OPERATION AND MAINTENANCE MANUAL (GENERAL INFORMATION) • CUSTOMER CONNECTION DIAGRAM (SPECIFIC FOR THE ORDER) • SCHEMATIC DIAGRAM (SPECIFIC FOR THE ORDER)

Hand tools Tool’s required  Screwdrivers, Standard & Phillips  Torx drivers T10-T50  Metric socket set, 7-17 mm  Lon extension (20”)  Torque wrench, 4-170 in./lb  Magnet  Nut starter

Meters • PWM compatible voltmeter • Clamp-on ammeter

Additional tools • • • •

1000 v Insulation tester Laptop with system software Cell phone Oscilloscope (with Isolated case)

First thing

• Do not apply power until you complete the static tests

The Troubleshooting approach • Take the logical approach – Take it all in     

Use all you senses Perform physical inspection Do a process of elimination Make alignment with sequence of operation Align with what is to what should be

– What does the display tell you – check the programing – How does the drive look on the inside

Check it out • • • • •

Installation Connection Environment Fuses Burnt marks or smell

VFD sections • Regulator—Controls the rectifier and inverter to produce the desired ac frequency and voltage. • Rectifier—Converts the fixed 60 Hz ac voltage input to dc. • Inverter—Switches the rectified dc voltage to ac, creating variable ac frequency (and controlling current flow, if desired).

VFD Introduction • VFDs convert AC to DC…then DC to AC (at varying frequency and voltage) AC

DC

Rectifier

460 V, 60 Hz

AC

Inverter

640 V, DC

307 V, 40 Hz

VFDs allow the motor to operate and consume electricity as if it were the right sized horsepower for the job.

TROUBLESHOOTING THE DRIVE THAT WORKS IN HAND MODE. • Before moving on try taking a voltage and current reading on the input and output of the drive. Both should be balanced. The output voltage must be balanced within a volt phase to phase with the motor connected.

DOES THE DRIVE RUN THE MOTOR IN HAND? Questions to Ask About the Problem. • • • • •

Did the motor ever run? Did it have problems when it was running? What changed since it did run? Is the problem repeatable? Does the problem always happen at the same time or with consistent repeatability?

DOES THE DRIVE RUN THE MOTOR IN HAND? • At this point try to run the motor using the hand start function of the drive. • Press the hand start key and slowly begin to increase the speed of the motor by pressing the plus key.

TROUBLESHOOTING THE DRIVE THAT WORKS IN HAND MODE.

• If the drive works the motor up and down in speed when in the hand mode, the drive is probably good.

DOES THE DRIVE RUN THE MOTOR IN HAND?

Questions to Ask About the Problem. • • • • •

Did the motor ever run? Did it have problems when it was running? What changed since it did run? Is the problem repeatable? Does the problem always happen at the same time or with consistent repeatability?

The Motor Won’t Run in Bypass Is there power to the bypass? – – – – –

Are the main or bypass fuses OK? Is the safety interlock closed? (TB1: 1 & 2) Is the motor overload tripped? Is the motor connected? For some drives: Is the building automation system giving a run command? (TB1: 2 & 3) (Use the customer connection diagram and bypass schematic for the drive to determine this.)

DIVIDE AND CONQUER Where Is the Problem?

NOTE!

• If the motor will not run in the drive mode or the drive is dead, before trying the bypass mode, MEGGER the motor and the wiring from the output of the drive or bypass first before continuing the process of troubleshooting!!!!

HOW TO MEGGER A MOTOR

Motor wiring

Know your motor wiring

Position T0 T1 T2 T3 T4 T5 T6

A ++ + - + ++

B + ++ + - -

C - + ++ + -

DIVIDE AND CONQUER Where Is the Problem?

• NOTE! • If the motor will not run in the drive mode or the drive is dead, before trying the bypass mode, MEGGER the motor and the wiring from the output of the drive or bypass first before continuing the process of troubleshooting!!!!

HOW TO MEGGER A MOTOR

MOTOR PROBLEMS TWO MODES OF FAILURE:

WINDING FAILURE

BEARING FAILURE

MOTOR PROBLEMS COIL FAILURES Coil Breakdown at the point of exit from the core

Coil Breakdown at the crown point due to high voltage spiking.

MOTOR PROBLEMS Ground Fault failure at the core.

MOTOR PROBLEMS Complete coil failure due to all or partial loss of phase.

MOTOR PROBLEMS BEARING FAILURES DUE TO POSSIBLE DRIVE RELATE PROBLEMS

BEARING FLUTING CAUSED BY ELECTROSTATIC DISCHARGE

Electric Motor Design

460 VAC 60Hz

=

Most electric induction motors were designed for operation on 3 phase sign wave power – either 50 or 60 Hz. The input power was balanced in frequency, phase (120 degrees apart) and in amplitude. Common mode voltage – the sum of the 3 phases would always equal zero volts. 42

Electric Motor Operation by VFD

+

=

When operated by VFD, the power to the motor is a series of pulses instead of a smooth sign wave. The input power is never balanced because the voltage is either 0 volts, positive, or negative with rapid switching between pulses. The Three phases of voltage pulses ensures that the common mode voltage is never equal to zero and instead is a “square wave” or “6 step” voltage. 43

Shaft Voltage Readings

44

PWM Drives Cause 1. High frequency transients (dv/dt) can break down the insulation between windings and cause corona discharge arcing which can short out the windings. 2. Because of the inherent voltage imbalance and dv/dt, the voltage pulses are capacitively induced on the motor shaft and can overcome the dielectric of the oil film in the motor bearings. Electrical discharges result in pitting and fluting damage in the bearing, breakdown of lubrication, and fluting failure of the bearing.

Motor Reliability for Inverter Driven Motors

Motor Winding Problems The motor winding insulation was changed to withstand the transient voltages and to prevent the corona discharges. NEMA MG1 specified motor design to meet what was known as “class F, G or H” insulation, and “corona resistant wire” was developed. The problem of electrical bearing damage was identified in the NEMA MG1 with for motors above and below NEMA frames NEMA recommended to use either ceramic bearings or shaft grounding. Shaft grounding also protects attached equipment.

46

VFD Induced Shaft Voltages and Bearing Currents in AC Motors  VFD induced capacitive voltages from the high switching speed of the pulse width modulation (PWM) drives discharge through motor bearings and cause electrical discharge machining (EDM) effect in the bearing race.  Rotor ground currents generated by PWM Drive will partly flow as rotor ground current through the bearings of the motor. These currents are caused by the rotor being connected to common ground with a significantly lower impedance path then the ground of the stator housing.

Shaft

VFD Drive

Stator

VFD Induced Voltages Rotor

Groun d

Groun d

Groun d

NEMA MG1 section 31.4.4.3 Motors below 500 Frame (NEMA 56 to 449T): More recently…potentially destructive bearing currents have occasionally occurred in much smaller motors… These drives can be generators of a common mode voltage which…oscillates at high frequency and is capacitively coupled to the rotor. This results in peak pulses as high as 10-40 volts from shaft to ground… Interruption of this current therefore requires insulating both bearings. Alternately, shaft grounding brushes may be used to divert the current around the bearing. It should be noted that insulating the motor bearings will not prevent the damage of other shaft connected equipment.

High Frequency Circulating Currents in Large AC, DC Motors & Generators  Induced by the magnetic flux imbalance around the motor shaft from the stator windings, these currents circulate through the motor bearings. Circulating currents are a problem in large AC and DC motors of over 100 hp.  Because these currents circulate through the motor via the shaft and bearings, the current flow must be either broken or an alternate path established to prevent bearing failures.

Stator

Shaft Currents Shaft Rotor

Groun d

Groun d

Groun d

High Frequency Flux encircling the rotor causing shaft bearing currents

NEMA MG1 section 31.4.4.3 Large Frame Motors (500 frame or larger): …voltages may be present under sinusoidal operation and are caused by magnetic dissymmetry's in the construction of these motors…current path…is from the motor frame through a bearing to the motor shaft, down the shaft, and through the other bearing back to the motor frame. This type of current can be interrupted by insulating one of the bearings. When VFD is used, the circulating currents described above increase from 60 Hz to KHz or MHz frequencies and may effect motors rated at 150 kW (200 HP). This is referred to as “High Frequency Circulating Current” Reference: A. Muetze, A. Binder, H. Vogel, J. Hering, “What can bearings bear? – How much current is too much? How much current reduction enough?” IEEE Magazine on Industry Applications, vol. 12, no. 6, pp. 57-64, November/December 2006.

Bearing Failure March 2005 Journal of Electrostatics “Statistical model of electrostatic discharge hazard in bearings of induction motor fed by inverter” by Adam Kempski et. al. “Electrical Discharge Machining (EDM) bearing currents have been found as the main cause of premature bearing damages in Pulse Width Modulation (PWM) inverter fed drives.” February 2007: Pump and Systems Magazine “How to Prevent Electrical Erosion in Bearings” by Daniel R. Snyder, P.E., SKF USA Inc. “An estimated 50 percent of all electric motor failures are attributed to bearings, but the bearings themselves are not usually the root cause. Other forces are at work, such as the increasingly common problem of stray currents.”

Motor Bearing Damage from Electrical Currents Electrical Discharge Machining (EDM) Bearing Pitting Damage

Electron Microscope (SEM) Image

1000x Magnified

Bearing Fluting Damage

EDM Pit EDM Pitting

52

Mitigation Strategies Isolate the shaft from the frame of the motor - Use insulated sleeve on the bearing journal - Replace steel bearings with ceramic bearings

Ground the shaft with spring loaded brush – Copper phosphor or bronze metal brush – Carbon block brush

53

New Conductive Microfiber Shaft GroundingTechnology

Uses several methods to transfer electrical currents*

Direct Contact Conduction Electrical Contact without mechanical contact by field emission

*IEEE paper, September 2007: Design Aspects of Conductive Microfiber Rings for Shaft Grounding Purposes, by Dr. Annette Muetze et. Al.

54

New Approach to Electrical Current Transfer ● Installation Difficulty ● Vibration due to “stickslip” ● Material Wear (not suitable at high surface rate)

●“Shaft run-out” is compensated by spring load ●Not effective above 2MHz signal

Within the elastic limit

●No Spring load ●Negligible wear of microfibers even high surface rate

●Continuous contact despite “shaft run-out”

●Easy Installation ●Low cost ●Maintenance Free 55

Shaft Grounding Ring Construction

Conductive Micro Fibers

Unique Characteristics 

Encircles complete 360 degree shaft area



Unaffected by dirt and grease providing continuous grounding



No maintenance required after installation 56

Shaft Grounding Ring Bearing Current Mitigation motors to 100 HP

Stator

Shaft

Rotor

Ground

V F D

Large Low and Medium Voltage Motors over 100 HP AEGIS Shaft Grounding Ring on DE

SKF Insocoat bearing bearing NDE

Stator

Rotor

Shaft

V F D

Ground

EST-ITW 58 Copyright

MOTOR PROBLEMS

One possible fix.

MOTOR PROBLEMS TRY GOOD HIGH FREQUENCY GROUNDING TECHNIQUES

MOTOR PROBLEMS OTHER WAYS TO CORRECT THE PROBLEM FARADAY SHIELDED MOTOR

INSULATED BEARINGS

MOTOR PROBLEMS SHAFT GROUNDING SYSTEM

OUTPUT FILTERS

The number one killer of electric motors is heat. Motors that run on variable frequency drives run hotter than motors that run across the line.

Voltage spikes can cause problems. Some drive manufactures are better at suppressing the spikes than others.

Premium efficient motors run cooler than standard general purpose motors

The Motor Won’t Run in Bypass •IS THERE POWER TO THE BYPASS?

•SAFETY INTERLOCK? •OVERLOAD?

START/STOP

If the Drive Blows Power Fuses

• Before plugging in another fuse ... • With power off, use the ohmmeter to check for input AND output shorts – Line-to-bus and motor-to-bus, is desirable. – Line-to-line if the bus connections aren’t readily available

Check programing Example: Trane TR-200 Series Start-Up 1. Parameter 1-03, TORQUE CHARACTERISTICS (For single motor applications factory default is ok - AUTO ENERGY OPTIMUM. VT. For multiple motors change to VARIABLE TORQUE.)

2. Parameter 1-20 kW or 1-21 HP, MOTOR POWER parameter 0-03 will determine if parameter 1-20 –OR- parameter 1-21 is accessible, other parameter is hidden

3. Parameter 1-22, MOTOR VOLTAGE

4. Parameter 1-23, MOTOR FREQUENCY 5. Parameter 1-24, MOTOR CURRENT 6. Parameter 1-25, MOTOR SPEED 7. Parameter 1-29, run AUTOMATIC MOTOR ADAPTATION

Start-Up Continued 1. Parameter 4-12, MIN. FREQUENCY (6Hz for fans, 18Hz for pumps) 2. Parameter 4-14, MAX. FREQUENCY (typically set to 60Hz)

3. Parameter 3-41, RAMP 1 UP TIME (60 sec for fans, 10 sec for pumps 4. Parameter 3-42, RAMP 1 DOWN TIME (60 sec for fans, 10 sec for pumps)

5. Parameter 5-12, COAST INVERSE (sets function of Terminal 27 – set to NO OPERATION if external signal not required)

Drive Layout Input

PWR Quality

Output

Period, range of q

Diode Pair in conduction

30o to 90o

D1 and D6

90o to 150o

D1 and D2

150o to 210o

D2 and D3

210o to 270o

D3 and D4

270o to 330o

D4 and D5

330o to 360o and 0o to 30o

D5 and D6

Magic Component's • Regulator – Electronic controls – Filters – Lots of Magic in the boxes which in realty is just electronics switching between 0 and 1.

‹#› Trane TR200 Variable Frequency Drive

• Silicon diode = 0.7v Schottky diode = 0.3v Germanium diode = 0.2v

Typical Schottky metals: Ti, Ni, Au, Pt, Pd

PWM Drive: Diode Bridge Rectifier AC

Rectifier

DC

PWM Drive Output Waveform

high speed

low speed

Time frame and Pulse width controlled by Microprocess or

Types of PWM Drives • Drives using bipolar transistors use a low carrier frequency (1 to 4 kHz). • Drives Using IGBTs: – Can use carrier frequencies greater than 10 kHz. – Some can be switched to use lower carrier frequencies.

TR200 Layout

Input/output Testing

DC buss +

DC buss -

DC Buss Voltage Test • DC Buss + to DC Buss – – Input Voltage X1.3 = Minimum at Full load – Input Voltage X 1.4 = Maximum Full load voltage

VFD Voltage • A-B, B-C, C-A = Line Imbalance: ± 3% • U-V, V-W, W-U= Balanced

BASIC ELECTRONIC TROUBLESHOOTING • • • •

Ohm checking the power semiconductors. Ohm checking the gate driver circuits. Checking the gate driver circuits with a scope. Running the motor in hand mode.

Ohm checking the power semiconductors. Set the ohm meter on either the diode check scale or the 2K scale if you are using a standard LCD style meter with a 9 volt battery. Start the process by placing the positive lead of the ohm meter on the positive bus and then check each input connection with the negative lead of the ohm meter noting the value of the reading on each input line connection.

Ohm checking the power semiconductors. NOTE: When ohm checking the power semiconductors bus cap charging may be noticed. Do not be alarmed. This is normal.

Now the ohm meter leads and repeat the process. Again note the readings. What should be observed if the power semiconductors are good, is that you will notice that in one direction the meter readings will be with in the range of 0.3 to 0.7 K ohms and out of scale in the opposite direction.

Ohm checking the power semiconductors. Repeat the same process to check the output semiconductors. Similar reading should be obtained with these devices. With these reading available, determine if the drive has sustained semiconductor damage and take the appropriate steps to repair the drive.

Input Testing Meter set to diode test • Meter + Lead to DC Buss + – Meter – to L1 ,L2, L3 ≈ ∞ (infinity) (After Charge Cap.)

• Meter - Lead to DC Buss + – Meter + to L1, L2, L3 ≈ .48

• Meter + Lead to DC Buss – – Meter – lead to L1, L2, L3 ≈.48

• Meter – lead to DC – – Meter + lead to L1, L2 L3 ≈ ∞ (infinity) (After Charge Cap.)

Checking the gate driver circuits with a scope. For those people who have access to an oscilloscope, below is the scope pattern you will see. This measurement is only available to you with drives sized 15 through 75 HP 460 Volt and 5 though 25 HP 208 Volt. Drives smaller and larger do not have access to the IGBT gate leads.

Drive Layout Input

PWR Quality

Output

• An inductor stores energy in the magnetic field created by the current. • When the current through a coil changes and an induced voltage is created as a result of the changing magnetic field, the direction of the induced voltage is such that it always opposes the change in current.

• What reactions do you see in AC or DC . • DC current • Back EMF present during DC turn-on until stabilized, Back EMF present with polarity reversed during DC turn-off until decay is complete. • AC current • Back EMF present alternating in each direction due to on off action of AC

Inductor Applications • Coils resist rapid changes in the current flowing through them. • Inductors freely pass steady dc current.

Reducing Harmonic Distortion • DC link reactor • AC line reactors

DC Link Reactors

AC Line Reactors

Input Reactor’s Effect Distorted Ideal

With reactor

Comparison

DC Link Reactors • Reduces harmonic distortion • Built into the drive as standard

• Requires one or two coils, can reduce the size of the bus capacitor

AC Line Reactors • Reduces harmonic distortion • Extra cost option — increases the drive’s size • Requires three coils

Comparison, continued

DC Link Reactors • Does not affect the drive’s AC line operating range • Protects against current surges • Voltage snubbers in the drive protect against voltage surges

AC Line Reactors • Reduces the AC voltage supplied to the drive

• Protects against current surges • Protects against voltage surges

AC Line Reactors • Drives with no DC link reactors generally require AC line reactors – To reduce harmonic distortion – More importantly, to keep the drive from being damaged by power line disturbances

Combining DC and AC Reactors

• Why not combine both? • Typical example: (from drivesmag.com) – no reactors 62% current distortion – 3% AC reactor 37% current distortion – 3% DC reactor 31% current distortion – 3% DC reactor + 3% AC reactor 28% current distortion

This isn’t cost effective!

Reducing Harmonic Distortion • • • • •

DC link reactor AC line reactors Harmonic traps 12-pulse input Active filters

Harmonic Traps

• Designed to “trap” specific harmonic • Specially designed for the individual building • Often applied once, at the point of common coupling of all building power

12-Pulse Input to the rest of the drive

• Eliminates the 5th and 7th harmonics • Needs a D-Y transformer and two rectifiers • The transformer – is expensive – probably isn’t supplied by the drive manufacturer

D-Y transformer

Active Filter

• How it works – Electronically monitors the AC power line – Switches power from or to the line based on the line’s condition

• Concerns – Expensive – Complex – Adds high frequency noise (EMI and RFI) to the building

Capacitors Pass A.C.

Capacitors Block D.C.

CAPACITOR A capacitor is an electronic device which consists of two plates separated by some type of insulator. A capacitor's value is commonly referred to in microfarads, one millionth of a farad. It is expressed in micro farads because the farad is such a large value of capacitance. When a DC voltage source is applied to the capacitor there is an initial surge of current, then the current stops. When the current stops flowing, the capacitor is in a charged state. If the DC source is removed from the capacitor, the capacitor will retain a voltage across its terminals. This charge can be discharged by connecting the plates together. Generally, if an AC voltage source is connected across the capacitor, the current will flow through the capacitor until the source is removed. The exceptions to the situation, where an AC voltage is applied to a capacitor, are going to be explained later.

Capacitors How much is it??? • • • • • •

Parallel Circuit Ct=C1+C2 Series Circuits For 2 Capacitors Ct=(C1xC2)/(C1+C2) For more than 2 capacitors in series Ct=(1)/((1/C1)+(1/C2)+(1/C3))etc.

Capacitor Applications • • • •

Power supply filters Spike Remover AC-DC Selective filter A Capacitor will pass the Fluctuation signal and completely block the steady DC level.

• DC BUSS CAPACITORS: THE GOOD,

THE BAD, AND THE UGLY!

Drive Layout Input

PWR Quality

Output

The bipolar junction transistor consists of three layers of highly purified silicon (or germanium) to which small amounts of boron (p-type) or phosphorus (n-type) have been added. The boundary between each layer forms a junction, which only allows current to flow from p to n. Connections to each layer are made by evaporating aluminum on the surface; the silicon dioxide coating protects the nonmetalized areas. A small current through the base-emitter junction causes a current 10 to 1000 times larger to flow between the collector and emitter. (The arrows show a positive current; the names of layers should not be taken literally.) The many uses of the junction transistor, from sensitive electronic detectors to powerful hi-fi amplifiers, all depend on this current amplification. © Microsoft Corporation. All Rights Reserved. "Bipolar Junction Transistors," Microsoft® Encarta® Encyclopedia 99. © 1993-1998 Microsoft

IGBT • There are 2 Count them 2 IGBT’S In Each module used in our VFD’s

Input/output test • Setup – – – –

Test for no input/output or DC bus voltage. Input and output drive wiring disconnected Set meter to Diode function Find Test Points (DC+, DC-, L1,L2,L3, U,V,W)

Input Testing • Meter + Lead to DC Buss + – Meter – to U, V, W ≈ ∞ (infinity) (After Charge Cap.)

• Meter - Lead to DC Buss + – Meter – to U,V, W ≈ .39

• Meter + lead to DC Buss – – Meter – Lead to U, V, W ≈ .39

• Meter – Lead to DC Buss – – Meter + lead U, V, W ≈ ∞ (infinity) (After Charge Cap.)

Input Testing • Meter + Lead to DC Buss – Meter – to L1 – L3 ≈.48 – Meter – to U – V ≈ .39

• Meter - Lead to DC Buss – – Meter – to L1, L2, L3 ≈ ∞ (infinity) (After Charge Cap.) – Meter – to U,V, W ≈ ∞ (infinity) (After Charge Cap.)

VFD Voltage • A-B, B-C, C-A = Line Imbalance: ± 3% • U-V, V-W, W-U= Balanced

Drive Control

Control • Communication protocols • Inputs and outputs – Binary or digital AC or DC example: (0-24VDC, open or closed) – Analog example: (4-20 ma 0-10 VDC, 0-5 VDC)

OPTO-COUPLER

EEPROM Electrically erasable programmable ROM With normal ROMs you have to replace the chip (or chips) when new BIOS instructions are introduced. With EEPROMs, a program tells the chip's controller to give it electronic amnesia and then downloads the new BIOS code into it. This means a manufacturer can easily distribute BIOS updates on floppy, for instance. This feature is also called flash BIOS, and you might also come across it in devices like modems and graphics/video cards.

Checking the gate driver circuits with a scope. For those people who have access to an oscilloscope, below is the scope pattern you will see. This measurement is only available to you with drives sized 15 through 75 HP 460 Volt and 5 though 25 HP 208 Volt. Drives smaller and larger do not have access to the IGBT gate leads.

Safety Stop

TR-200

Wiring the Drive

• Control Wiring • Terminal blocks

RS-485

can be unplugged Digital Inputs 12 & 18: Run Command 12 & 27: Interlock (MUST be Connected to 24 V supply) Analog Inputs and Outputs Run Relay 30 V AC, 1 A

Fault Relay 240 V AC, 2 A

Wiring the Drive

• Control Wiring • Terminal blocks can be unplugged Safety Contact Fire / Freeze / Etc. Plus 24 VDC

Digital Inputs: 12 & 27: Interlock (MUST be Connected to 24 V supply)

Parameter 304 ( Coast Inverse)

Display reads “UN READY” in lower right corner.

Wiring the Drive

• Control Wiring • Terminal blocks can be unplugged Start Command From Automation

Digital Inputs: 12 & 18 (Start / Stop) (MUST be Connected to 24 V supply)

Plus 24 VDC Parameter 302 ( Start ) Note: When Contact Opens Unit Ramps to a Stop

Wiring the Drive

• Control Wiring • Terminal blocks can be unplugged

Drive Fault Indication

Use Terminals 01 and 03 Registers a Drive Fault if not Powered up Terminal Block Located under Power Terminals

Parameter 326

(No Alarm)

Drive Run Indication Contacts are Low Voltage ( 30 VAC) Signals Automation Drive is Running

Parameter 323 (Running)

Wiring the Drive

• Control Wiring • Terminal blocks can be unplugged

Analog Input 53 Para 308 ( Reference) Para 309 (Low Scaling) 0 VDC Para 310 ( High Scaling) 10 VDC

Positive Voltage scaled 0 to 10 VDC Para 314 FROM AUTOMATION Common for Input Follower Signal

Terminal 60 Function set for (No Operation)

Open Loop

Analog Inputs Term 53 Term 54 Term 60 FUNCTION * SCALE LOW SCALE HIGH

*

0-10 V 308 309 310

0-10 V 311 312 313

4-20 mA 314 315 316

Set the FUNCTION of the terminal used for speed control to REFERENCE. Set the FUNCTION of unused terminals to NO OPERATION.

Note: All Trane drives have term 53 set for default as Reference & 0-10 VDC

‹#› Trane TR200 Variable Frequency Drive

VFD testing

By Pass Contactors