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54
DANGER
The following checks will require the electrical panel to be energized these trouble
shooting checks MUST BE PERFORMED BY A QUALIFIED ELECTRICAL
TECHNICIAN.
1. Remove lock and tag outs on the main power sources
2. Manually close disconnect switches and energize the control circuit or transformer with
its respective switch. Observe that the numbers 1, 3 & 4 are lit on the white lighted
terminal strip.
3. This tells you that there are no overloads or emergency stops tripped. On computer
controlled units, make sure that the POWER and RUN lights are lit at the lower left of
the computer.
4. Most electrical problems are related to mechanical malfunction (i.e. stuck motors,
jammed chain, non tripped limit switches, etc...) The most common failure is an
improperly adjusted limit switch. To check a limit switch, manually operate the limit
switch. If the computer terminal strips lights, the switch needs to be re-adjusted. For
more information on the limit switch see the manufactures information at the end of
this manual.
5. If a solenoid valve is suspected, and not cleared in the air checks section mentioned
previously, it can be electrically jumped to check operation.
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