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Troubleshooting
47. MM Models: Cylinder Motor Does Not Run or Reverse With Door Closed,
Cycle Selected and Start Button Pressed In Reversing Mode or
Nonreversing Mode
208-240 Volt/60 Hertz/3 Phase Gas and Steam Reversing and 480 Volt/60 Hertz/3 Phase Steam
Reversing Models
NOTE: If unit will not reverse when reversing is selected, check for proper operation and wiring of reversing
switch. Replace if necessary.
MM Models: Cylinder motor
does not run or reverse with
door closed, cycle selected
and start button pressed in
reversing mode or
nonreversing mode
Is
there120 VAC
to the COM terminal
of the door
switch?
TMB2174S-a
Correct wiring
between door
switch and L1
supply for
208-240 units.
Check
transformer on
480 Volt
machines.
Is
there 120 VAC
to the N.O. terminal
of the door
switch?
Check for proper
operation of door
switch arm and/
or replace door
switch.
Yes
No
No
Is
there 120 VAC
to terminal P2 of
the micro
control?
Correct wiring
between door
switch and
micro control.
Is
there 120 VAC
to terminal P1 of
the micro
control?
Replace
micro control.
Is
there 120 VAC
across the coils of
the motor
contactor?
Correct wiring
to the coil of
motor
contactor.
Is
there voltage
to terminals L1, L2
and L3 of motor
contactor?
Correct wiring
between motor
contactor
terminals and L1,
L2, L3 of TB1.
Is
there voltage
at terminals T1, T2
and T3 of the M
contactor?
Replace motor
contactor.
Is
there voltage
to terminals T1,
T2, T3 on the forward
contactor and voltage
to terminals U, V and
W on the reversing
contactor?
Correct wiring
between forward
contactor and motor
contactor and/or
correct wiring
between reverse
contactor and motor
contactor.
Yes
No
Yes
No
No
No
Yes
No
Yes
No
Continued on
next page
Yes
Yes
Yes
Содержание ATB50CG
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