Red Lion MDC - Manual (Page 46)

TROUBLESHOOTING GUIDE (Cont’d)
-44-
PROBLEMS POSSIBLE CAUSE REMEDIES
UNIT DOES NOT INDICATE
SPEED CORRECTLY
1. Type of input signal incorrectly selected.
2. Feedback input improperly connected.
3. Electrical noise interference.
4. Scaling parameters programmed incorrectly.
(PPR, MAX RPM, DSP UNIT)
1. Check DIP switch set-up on side of unit.
2. Check sensor connection.
3. Check power source for noise. Check signal
wire routing.
4.Check parameters in Program Scaling Menu.
Verify correct FB freq. in Program Diagnostics
Menu TEST DRV OUT.
UNIT DOES NOT REGULATE SPEED 1. Error GAIN is zero.
2. Open loop input held low. Unit in open loop mode.
1. Check GAIN setting in User Setpoints Module.
2. Check Open Loop input. It should be open
(not connected to common) for closed loop operation.
USER INPUT DOES NOT ACTIVATE
THE DESIRED FUNCTION
1. User input NOT properly programmed.
2. User input improperly connected.
1. Verify programming in Program User Menu.
2. Verify connections using Program Diagnostic
Menu READ USR.
UNIT OVERSHOOTS SPEED SETPOINT 1. Error GAIN too high. 1. Reduce GAIN setpoint.
UNIT RESPONDS SLOWLY
TO LOAD CHANGES
1. Error GAIN too low. 1. Increase GAIN setpoint.
UNIT RAMP RATE IS NON-LINEAR/
LARGE “TRIM” VALUES
1. Motor drive improperly calibrated.
2. MDC Isolated Drive Output improperly calibrated.
1. See motor drive manufacturer’s manual.
2. See Isolated Drive Output Calibration section
of manual.
UNIT DISPLAYS AN OVERFLOW MESSAGE 1. Value out of range. 1. See Overflow Indication section of manual.
ALARM OUTPUT WILL NOT RESET
FROM USER INPUT
1. User Input NOT properly programmed.
2. Momentary closure on User Input while condition
condition causing the alarm.
1. Verify programming in Program User Menu.
2. Provide a maintained closure or remove
causing alarm is still present.