Graco 334130A, Instructions-Parts List Manual

Page: 42 / 108

Troubleshooting
Code Description Type Cause Solution
Reduce flow rate
Increase temperature of accessory upstream.
Faulty accessory heater measure resistance between
heater leads.
Change Low Temp Alarm
T1 ★ _ Low Temp. Unit
_ Zone _
Alarm Zone
temperature
too low
Replace accessory
Reduce flow rate
Change Low Temp Alarm
T2 ★ _ Low Temp. Unit
_ Zone _
Deviation Zone
temperature
too low
Add zone (temperature) upstream
Change High Temp Alarm
T3 ★ _ High Temp.
Unit _ Zone _
Deviation Temperature
reading has
risen too high
Verify setpoint upstream is not hotter than this zone’s
setpoint
Ensure inlet and outlets are not obstructed. T4C_ AWB
Temperature
Runaway
Transformer
Alarm Cooling fan
not working
or inlet is
blocked/dirty
Verify fan is plugged in.
Ensure inlet and outlets are not obstructed. T4M_ AWB High
Transformer
Temp
Alarm Transformer
Temperature
is too High
Verify fan is plugged in.
Change High Temp Alarm T4 ★ _ High Temp.
Unit _ Zone _
Alarm Temperature
reading has
risen too high
Verify setpoint upstream is not hotter than this zone’s
setpoint
Check RTDwiring and harness/connector integrity. T6 ★ _ Sensor Err. Unit
_ Zone _
Alarm Bad RTD
Reading
Replace RTD
T6C_ AWB Invalid
Thermistor
Reading
Alarm Transformer
thermistor
temperature
is incorrect
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 T8V _ No Temp. Rise
Unit _ Zone _
Alarm Temperature
reading does
not change.
Check heater resistance on device
V1I_ Low CAN
Voltage, MZLP
_
Alarm Bad or
overloaded
power supply
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.
V1M_ Low Voltage
Line AWB, Unit
_
Deviation The voltage
to the AWB
is below
threshold
Verify transformer voltage top matches incoming
voltage. Verify incoming voltage is correct.
V4I_ High CAN
Voltage, MZLP
_
Alarm Bad or
overloaded
power supply
Verify power supply voltage is 24 VDC. If voltage is
high, replace power supply unit.
42 334130A