Rtrm Failure Modes; Variable Speed Vfd Troubleshooting - Trane Horizon OAKD Series Installation, Operation And Maintenance Manual

Table 20. TOAU UC600 troubleshooting (continued)
Trouble Possible Cause
High fire gas manifold pressure too high
Supply fan speed too low
Dirty or clogged filters
Unit Trips Heater
High Limit
Restricted discharge air duct
Temperature of air entering heater too high
Defective high limit
Protonode Not
Change Baud rate on UC600 to 38,400
Communicating

RTRM Failure Modes

WARNING
Live Electrical Components!
Failure to follow all electrical safety precautions when
exposed to live electrical components could result in
death or serious injury. When necessary to work with
live electrical components, have a qualified licensed
electrician or other individual who has been properly
trained in handling live electrical components perform
these tasks.
AVERTISSEMENT
Composants électriques sous tension !
Le non-respect de toutes les consignes de sécurité lors
de la manipulation de composants électriques sous
tension peut entraîner des blessures graves, voire
mortelles. S'il est nécessaire de travailler avec des
composants électriques sous tension, demandez à un
électricien qualifié et agréé ou à une autre personne
ayant la formation nécessaire pour manipuler des
composants électriques sous tension d'exécuter ces
tâches.
Following is the listing of RTRM failure indication causes.
System Failure
Check the voltage between RTRM terminals 6 and 9 on J6,
it should read approximately 32 Vdc. If no voltage is
present, a System failure has occurred. Refer to
"Microprocessor Control," p. 65
troubleshooting procedure.
Cooling Failure
CLP1 has opened during the 3 minute minimum "on time"
during four consecutive compressor starts, check CLP1 or
CLP2 by testing voltage between the J1-8 and J3-2
terminals on the RTRM and ground. If 24 Vac is present,
the CLPs have not tripped. If no voltage is present, CLPs
have tripped.
System Failure
Measure the voltage between terminals J6-9 and J6-6.
Normal Operation = approximately 32 Vdc
OAU-SVX01H-EN
Step 4 in
for the recommended
Alarms and Troubleshooting
System Failure = less than 1 Vdc, approximately 0.75 Vdc
Cool Failure
Measure the voltage between terminals J6-8 and J6-6.
Cool Operating = approximately 32 Vdc
Cool Off = less than 1 Vdc, approximately 0.75 Vdc
Cooling Failure = voltage alternates between 32 Vdc and
0.75 Vdc

Variable Speed VFD Troubleshooting

Table 21. Status indications
Upper Row
String Description
The drive is inhibited and cannot be
run. The SAFE TORQUE OFF signal is
Inhibit
not applied to SAFE TORQUE OFF
terminals or Pr06.015 is set to 0.
The drive is ready to run. The drive
enable is active, but the drive
Ready
inverter is not active because the
final drive run is not active.
The drive is stopped/holding zero
Stop
Run The drive is active and running.
Supply loss condition has been
Supply Loss
detected.
The motor is being decelerated to
Deceleration zero speed/frequency because the
final drive run has been deactivated.
The drive has tripped and is no
Trip longer controlling the motor. The trip
code appears in the lower display.
The regen unit is enabled and
Active
synchronized to the supply.
The drive is in the under voltage
Under Voltage state either in low voltage or high
voltage mode.
The motor pre-heat functions
Heat
inactive.
Drive Output
Stage
Disabled
Disabled
Enabled
speed.
Enabled
Enabled
Enabled
Disabled
Enabled
Disabled
Enabled
67