ALLIANCE T30 Series Troubleshooting Manual page 54

Electronic Control Troubleshooting
31. Will Not Start/Continue Running – EDC Control (continued)
Note: Tests conducted with vend
price satisfied and start button
pressed.
Is there voltage on B
terminal of motor
control relay?
Three phase.
Refer to Note
on next page
Is the unit equipped
with single phase or
three phase power?
Is there voltage to
terminal 5 of the
motor control relay?
Is there voltage to
terminal 8 of motor
control relay?
Is there supply voltage
to L1 and L2 of the
motor control relay?
Is there votlage across
L1 & T1 and L2 & T2?
52
Correct wiring
NO
between B and
H4-4.
YES
Single phase
Correct wiring
NO
between terminal 5
and power supply.
YES
NO
Replace motor
control relay.
YES
Correct wiring
NO
between L1, L2 and
power supply.
YES
YES
Replace motor
control relay.
NO
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Is there voltage across
NO
terminals 1 & 4 of
the fan motor?
YES
NO
Does the fan motor
run?
YES
Single phase
Is unit equipped with
single phase or three
phase power supply?
Three phase.
Refer to Note
on next page
Is there supply voltage
NO
to L2 & L3 of motor
control relay?
YES
Is there voltage across
YES
terminals L2 & T2 and
L3 & T3?
NO
Is there voltage at
NO
terminal 6 of motor
control relay?
YES
Is there voltage at
NO
terminal 9 of motor
control relay?
YES
Continued on next
page.
Correct wiring
between fan motor
and motor control
relay.
Replace fan motor.
Correct wiring
between L2, L3 and
supply.
Replace motor
control relay.
Correct wiring
between terminal 6
of motor control
relay and supply.
Replace motor
control relay.
T030D
T030D
70291301