Graco Therm-O-Flow 200 Instructions - Parts Manual page 42

Troubleshooting
Code Description
T4M#
AWB High
Transformer Temp
T4 _
High Temp. Unit _
Zone _
T6 _
Sensor Err. Unit _
Zone _
T6C#
AWB Invalid
Thermistor Reading
T8V_
No Temp. Rise Unit _
Zone _
V1|#
Low CAN Voltage,
MZLP _
V1M#
Low Voltage Line
AWB, Unit _
V4|#
High CAN Voltage,
MZLP _
V6M#
Wiring Error Line
MZLP _
V8M#
No Line Voltage
MZLP _
V4M#
AWB High Line
Voltage
42
Type Cause
Alarm
Transformer
Temperature is
too High
Alarm
Temperature
reading has
risen too high
Alarm
Bad RTD
Reading
Alarm
Transformer
thermistor
temperature is
incorrect
Alarm
Temperature
reading does
not change.
Alarm
Bad or
overloaded
power supply
Deviation
The voltage to
the AWB is
below
threshold
Alarm
Bad or
overloaded
power supply
Alarm
Incoming
power is wired
incorrectly
Alarm
Incoming line
voltage is less
than 100 VAC.
Alarm
Incoming
voltage is too
high
Solution
Ensure inlet and outlets are not obstructed.
Verify fan is plugged in.
Change High Temp Alarm Offset.
Verify setpoint upstream is not hotter than this
zone's setpoint.
Check RTD wiring and harness/connector
integrity.
Replace RTD.
Verify thermister is securely connected to J7 of
the AWB. Replace transformer if necessary.
Check fuses on MZLP connected to that Zone.
Check wiring to device.
Check heater resistance on device.
Verify power supply voltage is 24 VDC. If
voltage is low, disconnect the power lines and
re-check voltage reading. If voltage is still low,
replace power supply. If voltage is correct after
disconnecting the power lines.
Connect items one at a time until the voltage
drops to isolate the bad module.
Verify transformer voltage top matches
incoming voltage. Verify incoming voltage is
correct.
Verify power supply voltage is 24 VDC. If
voltage is high, replace power supply unit.
Correct the Wiring.
Verify transformer has the correct tap selected.
Verify CB-1 or FU-4, FU-5, and FU-6 are not
tripped/blown.
Verify RCD-1 is not tripped.
Measure incoming power with system
unplugged. If line voltage is less than 100 VAC,
contact qualified electrician to correct the low
voltage.
Verify the MZLP is plugged in at J2 and the
AWB is plugged in at J5 or J6.
Check incoming voltage is correct for configu-
ration.
Verify the transformer has the correct tap (400,
480, 600) selected.
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