Manitowoc Multiplex Ms-8, Service Manual

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ON/OFF Rocker Switch
FUNCTION
The switch is used to energize and de-energize the
Blended Ice Machine.
SPECIFICATIONS
Double-pole, Double-throw switch.
CHECK PROCEDURE
Use a voltmeter/ohm meter to check rocker switch
operation.
1. Inspect the rocker switch for correct wiring.
2. Isolate the rocker switch by disconnecting the wiring
connectors.
3. Check continuity across the rocker switch terminals.
Switch Setting Meter Reading
ON Closed
OFF Open
1. Replace the rocker switch if continuity readings do
not match both switch settings.
Transformer
FUNCTION
Reduces primary voltage to secondary voltage.
Steps down voltage from 120 or 230 VAC to 24 VDC.
SPECIFICATIONS
Steps down voltage from:
120/60/1 VAC to 24 VAC 75 VA
230/50-60/1 VAC to 24 VAC 75 VA
Normal Room Temperature or Recently De-energized
Resistance:
Primary
120 VDC = 6 to 8 ohms
230 VDC = 3 to 5 ohms
Secondary
120 VDC = .3 to .5 ohms
230 VDC = .1 to 3 ohms
CHECK PROCEDURE
Use an ohmmeter to check operation. Deduct meter and
lead resistance from fi nal readings (short leads together
to determine deduction value).
1. Inspect for correct wiring.
2. Isolate by disconnecting the wiring connectors.
3. Check primary winding resistance through terminals
with an ohm meter.
4. Within resistance range = Transformer is good
5. Outside resistance range = Replace transformer
6. Open = Transformer fuse open, check for shorts to
ground on secondary side and replace transformer.
Component Check Procedures