Alarms and Troubleshooting
OAU-SVX01H-EN
67
RTRM Failure Modes
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
in
“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
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
Unit Trips Heater
High Limit
High fire gas manifold pressure too high
Supply fan speed too low
Dirty or clogged filters
Restricted discharge air duct
Temperature of air entering heater too high
Defective high limit
Protonode Not
Communicating
Change Baud rate on UC600 to 38,400
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.
Table 20. TOAU UC600 troubleshooting (continued)
Trouble
Possible Cause
Table 21. Status indications
Upper Row
String
Description
Drive Output
Stage
Inhibit
The drive is inhibited and cannot be
run. The SAFE TORQUE OFF signal is
not applied to SAFE TORQUE OFF
terminals or Pr06.015 is set to 0.
Disabled
Ready
The drive is ready to run. The drive
enable is active, but the drive
inverter is not active because the
final drive run is not active.
Disabled
Stop
The drive is stopped/holding zero
speed.
Enabled
Run
The drive is active and running.
Enabled
Supply Loss
Supply loss condition has been
detected.
Enabled
Deceleration
The motor is being decelerated to
zero speed/frequency because the
final drive run has been deactivated.
Enabled
Trip
The drive has tripped and is no
longer controlling the motor. The trip
code appears in the lower display.
Disabled
Active
The regen unit is enabled and
synchronized to the supply.
Enabled
Under Voltage
The drive is in the under voltage
state either in low voltage or high
voltage mode.
Disabled
Heat
The motor pre-heat functions
inactive.
Enabled
