20
Curtis 1207B Manual
5
5 — DIAGNOSTICS & TROUBLESHOOTING
DIAGNOSTICS AND TROUBLESHOOTING
The 1207B controller provides diagnostics information to assist technicians
in troubleshooting drive system problems. The diagnostics information can be
obtained in two ways: reading the appropriate display on the programmer or
observing the fault codes issued by the Status LED. The Status LED is located
on top of the controller.
LED DIAGNOSTICS
During normal operation, with no faults present, the Status LED flashes a single
flash at approximately 1 flash/second. If the controller detects a fault, a 2-digit
fault identification code is flashed continuously until the fault is corrected. For
example, code “3,2”—welded direction contactor—appears as:
( 3 , 2 )
( 3 , 2 )
( 3 , 2 )
The codes are listed in Table 1. For suggestions about possible causes of the
various faults, refer to the troubleshooting chart (Table 2).
Table 1
LED CODES
LED CODE
EXPLANATION
LED off
no power or defective controller
solid on
defective controller
single flash
controller operational; no faults
1,2
hardware fail-safe error
1,3
M- fault or motor output short
1,4
sequencing fault (SRO)
2,1
5k
Ω
–0 or throttle wiper input fault
2,2
emerg. rev. circuit check fault (BB wiring)
2,3
high-pedal-disable fault (HPD)
2,4
Throttle Type setting changed
3,1
contactor or shunt driver overcurrent
3,2
welded direction contactor
3,3
incorrect main driver feedback signal
3,4
missing contactor or shunt
4,1
low battery voltage
4,2
overvoltage
4,3
thermal cutback
4,4
[reserved for future use]
Note: Only one fault is indicated at a time, and faults are not queued up.
