MAINTENANCE
3-10
Service Manual
3-97
Single-Phase
Check # 1
Set power switch S1 to OFF (0)
Measure resistance between the conductors (line and neutral) on
the plug of the power cord. Do not use the ground conductor on
the plug as a measuring point.
Check power cord and power
switch S1. Replace faulty
component (Fig 4-4)
Meter
indicates an open
?
No
Set power switch S1 to ON (1). Measure resistance between the
conductors (line and neutral) on the plug of the power cord. This
reading is the resistance across the control transformer primary for
the selected input voltage.
Meter indicates
18 ohms (200V)
20 ohms (208V)
22 ohms (230V)
22 ohms (240V)
56 ohms (400V)
65 ohms (480V)
?
To
page 3-13,
Check # 2
Indicates
low ohms or
short
?
Indicates
high ohms or
infinity ?
Isolate and check control
transformer T1, power switch S1,
input filter MOV1, capacitor C1,
and associated wiring for shorts.
Repair problem and repeat
check.
Isolate and check control
transformer T1, power switch S1,
fuses F1 and F2 and associated
wiring for opens.
Repair problem and repeat check.
No
Yes
Yes
Yes
Yes
No
To Next Page
Loading...
