Page 7-20 Troubleshooting
Revised 10/14
ITW Dynatec
D SERIES V6 DCL ASU Manuals
Problem Possible Cause
Hopper Heater Open 1. Disconnection in hopper
heater circuit.
2. Disconnection between
Power Module and the
Temperature Module.
3. The ASU circuit breaker
(on the front panel) is
inoperative.
4. Open hopper heater
element.
(Optional) Drop-in Grid 1. Setpoints have been
Overtemp programmed without
enough deviation.
2. Grid sensor inoperative.
3. Grid control solid state
relay inoperative.
AUX Power PCB
Heater
Sensor
Solution
1. Inspect hopper heater wiring for
proper connections.
2. Verify that all connections are
properly made between the Power
and Temperature Modules.
3.Visually and electrically inspect for a
short circuit to ground in the hopper
heater circuit. This will be limited to
between the hopper triac on the Power
Module and the hopper heater.
4. Remove both lead wires from
hopper heater plate. Use an ohm-
meter to measure resistance across
the plate. Infinitely high resistance
values indicate an open heating element
and heater plate which must be
replaced.
1. Re-program setpoints, allowing a
larger deviation between the high
and low limits.
2. Examine grid sensor assembly
for intermittent break in sensor lead.
Remove sensor bulb from grid. Replace
grid sensor if resistance does not
comply with resistance table.
3. Use a clamp-on ammeter to monitor
current on AUX Power PCB. If grid
zone is switched OFF, the current will
read 0 amps. If current still flows, re-
place shorted solid state relay.
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