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P24A & P34A Service Manual
Symptom: Machine Stopped (con't)
High/Low pressure safety switch (1PS) tripped
Low oil pressure tripped (OPS)
Defective control panel component such as
1PB, 1SS, 1M contact, 2CR contact
Circuit breaker (CB2 or CB3) for pump or
cutter motor tripped.
12/17/12
Possible Cause
Possible Remedy
If the machine stops by low pressure cutout, the
switch will reset automatically when the
pressure raises to the "cut-in" setting. Check
thaw gas valve (18) to make sure it opens
during harvest time.
If the machine stops by high pressure cutout,
the switch will have to be manually reset after
the pressure drops below the "cut-in" setting.
Check the head pressure during the next freeze
cycle. See FIGURE 9-2, Section 9 (High/Low
Pressure Switch).
Manually reset the switch after the switch
heater cools. Check the crankcase oil level
(1/4-3/4 full). Add oil if below 1/4 glass before
attempting to restart the machine.
Restart the machine and check net oil pressure
(net oil pressure = oil pump line pressure
minus crankcase suction pressure).
FIGURE 9-4, Section 9 (Oil Pressure Switch).
See "Low Compressor Oil Pressure".
Net oil pressure range:
Mycom = 17-28 psig
Vilter = 35-50 psig
See FIGURE 6-3, Wiring Schematic, and
check for open circuit. Refer to FIGURES 6-1
and 6-2, Control Panel to identify parts. Check
for loose wires. Replace defective part, restart
machine, check power supply, and current
draw.
Check for loose connection on all terminals,
reset breaker and check amp draw against
breaker rating.
Check voltage and current
unbalance, Section 3.
defective.
TROUBLESHOOTING
See
Replace breaker if
8-3
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