Trane TR150 - Incorrect Motor Operation

Unit ready
Terminal 27 is low (no signal).
Ensure that terminal 27 is logic “1”. Refer to the Input
Terminal Signal Test.
Run OK, 0 Hz
This message indicates that a run command has been
given to the frequency converter but the reference (speed
command) is zero or missing.
Check control wiring to ensure that the proper reference
signal is present at the input terminals. Also check that the
unit is properly programmed to accept the signal provided.
Refer to the Input Terminal Signal Test.
O 1 (2 or 3)
This message indicates that bit #1 (or #2, or #3) in the
control word is logic “0”. This situation only occurs when
the frequency converter is being controlled via the
eldbus.
A correct control word must be transmitted to the
frequency converter over the communication bus.
STOP
One of the digital input terminals 16, 17, 27, 29, 32, or 33
is programmed for “Stop Inverse” and the corresponding
terminal is low (logic “0”).
Ensure that the above parameters are programmed
correctly and that any digital input programmed for “Stop
Inverse” is high (logic “1”).
Display Indication that the unit is functioning, but there
is no output.
If the unit is equipped with external 24 V DC option, check
that the main power is applied to the frequency converter.
NOTICE
In this case, the display alternately ashes Warning 8.
4.5.6 Incorrect Motor Operation
A fault can occur in the event of incorrect motor
operation. The symptoms and causes may vary consid-
erably. The following sections list many of the possible
problems by symptom along with recommended
procedures for determining their causes.
Wrong speed/unit does not respond to command
Possible cause: Incorrect reference (speed command).
Actions:
1. Ensure that the unit is programmed correctly
according to the reference signal being used.
2. Ensure that all reference limits are set correctly.
3. Perform the test chapter 6.4.7 Input Terminal
Signal Tests to check for faulty reference signals.
Motor speed unstable
Possible causes:
•
Incorrect parameter settings.
•
Faulty current feedback circuit.
•
Loss of motor (output) phase.
Actions:
1. Check settings of all motor parameters, including
all motor compensation settings (slip compen-
sation, load compensation, and so on).
2. For closed-loop operation, check PID settings.
3. Perform test as described in chapter 6.4.7 Input
Terminal Signal Tests to check for faulty reference
signals.
4. Perform test as described in chapter 6.4.6 Output
Imbalance of Motor Supply Voltage Test to check
for loss of motor phase.
Motor runs rough
Possible cause:
•
Overmagnetisation (incorrect motor settings).
•
IGBT misring.
NOTICE
The motor may stall when loaded, or the frequency
converter may trip occasionally on Alarm 13, Over
Current.
Action:
1. Check the setting of all motor parameters, see
chapter 6.4.6 Output Imbalance of Motor Supply
Voltage Test.
2. If output voltage is unbalanced, see
chapter 6.4.6 Output Imbalance of Motor Supply
Voltage Test.
Motor draws high current but cannot start
Possible causes:
•
Open winding in motor.
•
Open connection to motor.
Actions:
1. Perform the test in chapter 6.4.6 Output Imbalance
of Motor Supply Voltage Test to ensure that the
frequency converter provides correct output (see
Motor Runs Rough above).
2. Check motor for open windings. Check all motor
wiring connections.
3. Run an AMA to check the motor for open
windings and unbalanced resistance. Inspect all
motor wiring connections.
Troubleshooting TR150 and TR170 Service Manual
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