TM 10-4610-310-14
0077 00
MALFUNCTION
TEST/INSPECTION
CORRECTIVE ACTION
With power off, place switch
Tighten any loose connections. Repair
(SW11) in the `on' position and
and replace any broken or burnt wires.
check for continuity between the
Replace if continuity doesn't exists in
terminal with wire 2 and the
the wire.
terminal with wire 11.
Check PLC.
If output light 9 on the PLC is
energized (meaning the heater
control relay should be
energized) .With power on and
heater switch on, check the
voltage (120 VAC) at wire 37 on
the heater control relay to the
Replace control relay if unserviceable.
neutral wire 3 on the heater
control relay. If the indicating
flag on the control relay is
"pulled in" (depressed position)
the coil of the control relay is
okay.
If the coil of the control relay is
okay as determined above check
the contacts of the relay by
checking incoming 240VAC at
wire 62 and wire 63 of the relay.
Replace control relay if the voltage is
Turn the heater switch on - with
present on the inlet side but not on the
the relay "pulled in" (switched
outlet side.
2. Immersion Heater not
on) check the outgoing voltage
working control module -
of the relay at wire 76 and wire
continued
77. If the voltage is present on
the in and out of the relay, the
relay contacts are okay.
Check to see if circuit breaker
Reset the circuit breaker.
(CB3) is off or tripped.
With power off, check the
Tighten any loose connections. Repair
connections and continuity of
and replace any broken or burnt wires.
wire 62 and 63 from the circuit
Replace if continuity doesn't exists in
breaker (CB3) to the control
the wire.
relay (CR1).
With power off, check the
Tighten any loose connections. Repair
connections and continuity of
and replace any broken or burnt wires.
wire 60 and 61 at the line side of
Replace if continuity doesn't exists in
the circuit breaker (CB3).
the wire.
0077 00-2
