Curtis PMC 1209B/1221B/1221C/1231C Manual
36
TROUBLESHOOTING & BENCH TESTING
Bench Test Procedure
A. Hook up the controller as shown. Connect the voltmeter leads to the
controller’s B+ and B- terminals.
B. Turn on the power switch (not the keyswitch) and watch the voltmeter. Its
reading should build up slowly over several seconds to within a couple of volts
of full battery voltage. If this voltage does not come up, the controller is bad.
C. Now turn on the keyswitch. The main contactor should turn on and the
voltage at the controller’s B+ and B- terminals should now equal the full
battery voltage. Move the throttle through its range. The lamps should
increase in brightness.
D. If the controller has HPD, test this feature as follows:
1. Turn off the keyswitch.
2. Move the potbox lever to about halfway.
3. Turn the keyswitch switch on. Verify that the lamps do not
come on until the potbox lever is moved most of the way
toward OFF and then moved back up.
E. Test the controller’s throttle fault protection feature by pulling off one of the
potbox’s two connections to the controller’s throttle input terminals while
the lamps are on (potbox lever in the ON position). The lamps should turn
off. With the potbox lever still in the ON position, reconnect the wire. The
lamps should smoothly increase in brightness to their previous level.
F. Finally, remove the controller from the test setup and check its internal plug
diode, as described in Troubleshooting Procedure 4-G .
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