Bernhard EXPRESS DUAL ED2000 - Electrical Fault Finding

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EXPRESS DUAL • ED2000

USE A QUALIFIED ELECTRICIAN

In the event of any motor not starting, the following procedure should be adopted:

7.1 Check that STOP BUTTON in control panel on top of machine is not permanently in STOP

position.

7.2 Check fuses.

7.3 Check voltage in electrical junction box, low-right hand side of machine. Then in the

control panel box.

7.4 Check for open circuit on overload, terminals 95 and 96, to determine whether or not main

motor is faulty. If open press red resetting button on overload.

7.5 To determine that all three contactors are OK test each one by pushing start button on

the individual contactors, they should noticeably pull in. This can be checked by someone

looking in the junction box while the start buttons are pressed.

7.6 Traverse

If the contactor is functioning properly check the microswitch. If this is found to be OK

check capacitor if possible. If neither of these is faulty, then the motor is probably at fault.

7.7 Reel Drive

If the contactor is functioning properly, check the capacitor.

If neither are faulty then the motor is probably at fault.

7.8 Main Motor

If the contactor is functioning correctly, check the load current with an ammeter across

terminals T2 and T3 on Thermal overload. If this exceeds full load current indicated on

the motor identication plate then a new motor is needed. If the reading is below full load

current then possibly the overload is set too low.

NOTE Before assuming that there is an electrical fault in any of the systems ensure that the

mechanical drive assemblies attached to a particular motor are moving freely, and have

not got increased resistance due to damage, or the build up of dirt. This can best be done

by detaching the motor drive and ensuring that the mechanism is moving freely.

7. Electrical Fault Finding