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Troubleshooting
48. MM Nonreversing Models: Motor Does Not Run With Door Closed, Cycle
Selected and Start Button Pressed (continued)
120 Volt/60 Hertz/1 Phase Gas and Steam; 208-240 Volt/60 Hertz/3 Phase Gas; 480 Volt/60
Hertz/3 Phase Steam
NOTE: Voltage checks referenced to are for neutral unless stated otherwise.
Is there
120 VAC on terminal
T1 of the motor relay for
single phase units, or across
T1, T2 and T3 for three
phase units?
TMB2175S-b
240 VAC units:
Is there 120 VAC to
terminal 1 of the
motor?
Correct wiring
between motor
CR1.
Is there
240 VAC across
terminals 1 and 4 of
the motor?
No
Yes
Continued from
previous page
Is there
120 VAC across the
terminals 1 and 4 of
the motor?
Correct wiring
to motor.
Replace
motor.
Yes
No
Yes
Replace motor
control relay.
Replace
motor.
Yes
Is there
120 VAC to terminal 8
of CR1?
Correct
wiring
between
CR1-8 and
L2.
Is there
120 VAC to terminal 7
of CR1?
Replace
CR1.
Correct wiring
between
CR1-7 and
terminal 4 of
the motor.
No
Yes
No
No
Yes
Is there
120 VAC on terminal
L1 of the motor relay for
single phase units, or across
L1, L2 and L3 for three
phase units?
Correct wiring
between motor
and motor
relay and the
terminal block.
No
Yes
No
Содержание ATB50CG
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