IMPULSE•T Instruction Manual – October 2015
6-4
Drive Faults, Alarms, and Indicators
Table 6-3: Drive Faults, Alarms, and Indicators
Motor rotation is in the wrong direction. 1. Verify FWD/REV or UP/DN is wired correctly at the interface card.
2. Switch any two leads on U/T1, V/T2, or W/T3 going to the motor.
3. Check parameter B3-04.
Motor rotates, but at minimum speed
only.
1. Check wiring of speed inputs and verify inputs (U1-10).
2. Verify speed reference setting (A1-04).
3. Verify reference and run source settings are correct (B3-01,
B3-02).
4. Check if motor stalled due to excessive current (U1-03).
Motor RPM too high or too low. 1. Compare motor nameplate full load current with E2-01 parameters.
2. Check maximum frequency setting (E1-04).
3. Check minimum frequency setting (E1-09).
Symptom Corrective Action
Fault Code Fault or Indicator Name/Description Corrective Action
Fault
Alarm
BB (flashing)
Base Block
External Base Block Indicator. The
flashing base block signal is the result of
a multi-function input in the terminal strip.
The base block indicates that the drive’s
IGBTs have been disabled. The motor will
begin coasting when the base block input
is received. If a RUN command is still
present when the BB signal is removed,
the output voltage will be restored to the
previous operating level and operation
will continue at the previously
commanded frequency.
1. Check constants H1-01 through
H1-05 for proper programming.
2. Check terminal status. (U1-10)
X
CALL (flashing)
Serial Communication Transmission
Error. Control data is not received
correctly after power supply is turned ON
for 2 sec.
1. Check serial device
connections.
2. Ensure drive is properly
programmed for serial
communication.
X
COF
Current Offset Fault. The drive
automatically adjusts the current offset,
the calculated value exceeded the
allowable setting range
1. Press reset.
2. Check brake.
3. Check brake contact.
X
CPF02
A/D Conversion Error. An A/D
conversion error occurred.
1. Cycle power to the drive.
2. Ensure that the control board
terminals and wiring are
shielded from electrical noise.
3. Check resistance of
potentiometer.
4. Replace the drive.
X
CPF06
Drive specification mismatch during
terminal board or control board
replacement
1. Cycle power to the drive.
2. If the problem continues,
replace the drive.
X
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