Electrical Troubleshooting - Motrec E-242HD Operator And Maintenance Manual

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Table Of Contents

Table of Contents

Maintenance

Maintenance work must be performed by trained service technicians only.

It is the responsibility of the owner of this vehicle to ensure that the services technicians are properly

trained, understand and obey the safety rules and guidelines (ANSI B56).

All service technicians must read and understand the maintenance warning section in this manual.

Before any maintenance work, park the vehicle on a flat level surface, turn off all switches, remove the

key, lift the wheels off the ground, secure with jack stands of adequate capacity, disconnect charger.

Always wear safety glasses.

Batteries emit highly explosive gases that can be ignited by a spark. Before disconnecting a high

current terminal, turn off all switches, disconnect battery charger, disconnect batteries.

Keep clear from moving parts such as tires, sheaves and motor.

PMC SELF DIAGNOSTIC

If your PMC comes with a status led, use the flashing code to help troubleshooting.

BATTERY VOLTAGE

Make sure batteries are securely connected. Measure voltage between + and - terminals. We will call

this value B+ or full battery voltage.

ACCESSORIES NOT WORKING

Check the fuses on the batteries and the DC/DC converter.

Check voltage across + and – terminals on the battery gage; if not B+, check wiring.

Turn the key switch ON, check voltage between output terminal on the key switch and the -

terminal on the battery gage; if not B+, replace the key switch.

Check voltage across DC/DC converter output terminals; if not 12-Volt, replace the converter.

Depress the accessory switch, check voltage across accessory terminals. If not 12-Volt, replace the

switch. If 12-Volt, replace the accessory.

FORWARD ONLY

On a SEPEX motor control, check the reverse signal input on the controller.

On a series wound motor control, a bad reverse contactor is the most probable cause of the problem.

Switch to reverse and check voltage on the reverse control wire. If not B+, replace the F/R switch. If

B+, turn off the key switch, disconnect batteries, disconnect power terminals on the F/R contactors,

check the resistance across N.C. power terminals of the reverse contactor. If not 0 ohm, change the

reverse contactor. If 0 ohms, switch to forward and check the resistance across the forward N.O. power

terminals. If not 0 ohms, change the forward contactor.