ALLIANCE T30 Series Troubleshooting Manual page 57

32. Will Not Start/Continue Running – OPL Microprocessor Control
(continued)
Tests conducted with cycle selected and
start key pad activated.
Is there voltage at
terminal 7 on OPL
Micro?
YES
Is
there voltage
across terminals
B & A of motor control relay
for OM model and terminals
0 & 1 for RM
models?
YES
Is unit supplied with
single phase or three
phase power?
Three phase. Gas and steam.
Refer to Note on next page.
Is there voltage to L1
and L2 of the motor
control relay?
YES
Is there voltage to T1
and T2 of the motor
control relay?
YES
Is there
voltage at terminal
5 on the motor control
relay for OM models and
terminal 2 for RM
models?
YES
Is there
voltage across
terminals 5 & 8 of
the motor control relay for OM
models and terminals 2
& 4 for RM
models?
NO
70291301
NO
Replace OPL Micro.
NO
Correct wiring to
motor control relay.
Single phase
Reference voltage to
supply neutral.
Correct wiring
NO
between L1, L2 and
power supply.
NO
Replace motor
control relay.
Correct wiring
NO
between motor
control relay and
power supply.
YES
Replace motor
control relay.
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Electronic Control Troubleshooting
Is there voltage
across terminals
1 & 4 of fan
motor?
YES
NO
Does the fan
motor run?
YES
Does the unit
YES
have reversing
capabilities?
NO
Single phase
Does the unit
have single
phase or three
phase supply?
Three phase. Gas and steam.
Refer to Note on next page.
Is
there voltage
NO
to L2 and L3 on
the motor control
relay?
YES
Is
there voltage
NO
to T2 and T3 on
the motor control
relay?
Is there voltage to
terminal 6 of motor
control relay?
YES
Is there voltage
across terminals 6 & 9 of
motor control relay?
NO
Correct wiring
NO
between fan motor
and motor control
relay.
Replace fan motor.
See cylinder
rotation. Either
forward or reverse.
Correct wiring
between L2, L3 and
power supply.
Replace motor
control relay.
Correct wiring
between terminal
NO
6 motor control
relay and supply
voltage.
YES
Replace motor
control relay.
Continued on next
page.
TMB1824S
TMB1824S
55