Service manual

70380601 113
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On Premise Micro Control (OM) Troubleshooting
45.Motor Will Not Start/Run
Is there
supply voltage
at terminals 5, 3 and 1
at the motor
contactor?
Motor Will Not
Start/Run
Is there
voltage between
H2-7 and H2-9?
Is there
24 VAC across
the coil of the motor
control relay?
Yes
Replace
control.
No
Correct wiring
to coil of
motor relay .
No
Is there
supply voltage at
black wire on the
motor control
relay?
No
Correct wiring
between black
wire and power
supply.
Is there
supply voltage at
black wire on the
motor control
relay?
No
Replace motor
control relay.
TMB2282S
Yes
No
Correct wiring
between motor
and motor
control relay.
Is there supply
voltage across
terminals 1 & 4 of
the motor?
Yes
Is the unit
equipped with single
phase or three phase
power?
Yes
Gas, steam and electric heat.
Single and three phase power supply.
(1)
(2)
(3)
(4)
(5)
Note: Test conducted with vend
price satisfied and start button
pressed.
Note: For high voltage three
phase supply (200 volts or
higher), the motor is
supplied by L1, L2,
L3 through the motor
contactor terminals T1,
T2, T3. Make the appropriate
adjustments when doing
voltage checks.
Single
phase
Replace
motor.
Yes
3 phase
(6)
Correct wiring
between L1, L2,
L3 and power
supply.
Is there
supply voltage
at terminals 6, 4 and 2
on the motor
contactor?
No
Yes
Replace motor
control relay.
Yes
(7)
Is there
supply voltage
between L1-L2, L2-L3
and L1-L3 and T1-T2,
T2-T3 and T1-T3
of motors?
Replace
motor.
Correct wiring
between motor
and motor
contactor.
No
No
Yes
(8)