Curtis Instruments PMC 1200 Series, Руководство пользователя

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Curtis PMC 1209B/1221B/1221C/1231C Manual 29
TROUBLESHOOTING & BENCH TESTING
Fig. 18
Guide to troubleshooting procedures. [To use this guide, refer to the speci fi ed
PROCEDURES
that follow.]
D
if NO
if NO
if NO
1-D
1-D
1-C
2-D
2-D
2-E
3-A
3-C
3-E
3-B
3-C
3-E, F
4-C
4-D, E
4-F, G, H, I
Check voltage at
CONTROLLER
B- and
BATTERY
B+ terminals.
It should read full voltage for system.
1-A, B, C
if YES
Check voltage at
CONTROLLER
B- and
CONTROLLER
B+ terminals.
It should read 1 to 5 volts less than full battery voltage.
if NO
if NO
Check voltage at contactor and at KSI terminal.
Contactor should read full rated voltage, and KSI must be above 8V.
2-A, B, C
TEST
2 Check for main contactor operation and KSI
TEST
1 Check for power to the controller
TEST
3 Check potbox circuitry
(0–5k Ω throttles)
Check voltage across contactor power terminals.
There should be no measurable voltage drop.
if YES
if YES
Check resistance at potbox wires while depressing pedal.
Resistance should be between 0–50 ohms with pedal
UP
, and
4500–5500 ohms with pedal
DOWN
.
Check for shorts between potbox wires and vehicle frame.
Resistance should be at least 1 megohm.
Check voltage at upper throttle input terminal on controller.
Voltage should be 2.7 volts with pedal
UP
, and
7.0 volts with pedal
DOWN
, ± a few tenths of a volt.
if YES
if YES
TEST
4 Check for controller output
if YES
4-A, B, C
if NO
if NO
if NO
Check voltage output while depressing pedal (B+ to M-).
Voltage should be zero with pedal
UP
, and full battery voltage
with pedal
DOWN
.
Check current in controller’s M- (motor field) lead while
depressing pedal.
Current should be high, and motor should turn.
Bad, discharged, or miswired
batteries, or corroded
connections.
TOO HIGH
: contactor is welded.
TOO LOW
: 250 Ω resistor or
controller is defective.
Trace flow to locate
problem.
If voltage drop occurs,
contactor is defective.
Defective potbox, broken wires
to potbox, or improper
mechanical operation.
If lower than 1 M Ω , wiring or
potbox is defective.
Controller is defective.
If no current, look for open
circuit. If current is high but
motor won’t turn, check motor,
wiring & plug diode.
Terminal area is probably
contaminated with acid or
dirt.