7:2
Table 7-1. Red LED Functions and Possible Causes for Fault.
Symbol
Indicated
Possible Causes
BBK
Base Driver Blocked
(DISABLED)
•
Dip switch 1SW-7 turned on, preventing output transistors from
turning ON. Use only when troubleshooting controller.
COM
Communication Error
•
Noise present when using optional RS232 connector. Incorrect
switch setting on 1SW-3 and 1SW-4 if CPU LED also illumi-
nated.
CPU
Microporcessor Fault
•
Regulator component failure.
•
Sequencing or encoder miswired, or improper switch position.
•
Low voltage on regulator power supply.
•
Encoder miswired if SFB LED also illuminated.
•
Incorrect switch setting on 1SW-3 and 1SW-4 if COM LED also
illuminated.
SFB
Speed Feedback
•
Motor rotational speed exceeded value selected by OS pot.
•
Motor-mounted encoder failure.
•
Encoder miswired if CPU LED also illuminated.
OL
Inverse Time Over-
load
•
Output motor current exceeded allowable overload as adjusted
by OL pot.
•
Motor’s RMS load greater than continuous motor rating.
UV
Undervoltage
•
D-C snubber resistor shorted.
•
Input voltage less than 207 V when 230 V input selected.
•
Input voltage less than 188 V when 208 V input selected.
PL
Phase Loss
•
Input phase loss. Motor lead or motor ground present.
SZ
Speed/Torque Mode
•
Speed reference operating below value selected with PG pot.
SZ
Position Mode
•
Positioning complete.
POS
Pulse Buffer Overflow
in Position Mode
•
Accel/Decel rate too short for load.
OH
Overtemperature
•
Ambient temperature of controller exceeds 55C.
•
Cooling fan failure
•
Regenerative power required for application greater than inter-
nal D-C snubber resistor capability.
OV
Overvoltage
•
Input voltage greater than 255 V.
•
External D-C snubber resistance is too large.
OC
Overcurrent
•
Short in power devices (motor, output transistor, or D-C bus
components).
•
Line transient.
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