Alto-Shaam Vector VMC-H2 Service Manual

TROUBLESHOOTING
Ve ct or ™ H Se ries ▪ S ervice Ma nual ▪ MN -4 654 4 ▪ Rev 0 1 ▪ 11/19
55
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Verify the oven has the correct supplied voltage
and phase.
No
Inform the customer to call an electrician.
Yes
Is the chamber on and calling for heat?
No
Turn the chamber ON.
Yes
Does the voltage selection transformer have line
voltage supplied to it?
No
Inspect the wiring to the voltage selection
transformer between circuit breakers 5 and 6
for any open, disconnected, or broken cables
and connections.
Yes
Does the voltage selection transformer have
12VAC out of the secondary side?
No
Replace the voltage selection transformer.
Yes
Locate the 4-wire VFD connection on the control
board. Chamber 1 P2, Chamber 2 P12, Chamber 3
P13, and Chamber 4, P14. Measure DC voltage
across the yellow and orange wire. Is there 2-
5VDC?
(If motor is set to 100%, voltage should be 4.4VDC,
at 20% it should be 2.5VDC.)
No
Check the VFD cable connector pins are all
secure and fully depressed into the Molex
connector. Make sure the connector is
properly at the control board. Replace the
control board.
Yes
Disconnect the Molex connector between the VFD
and motor. Is there voltage output from the VFD
to the motor?
No
Replace the VFD.
Yes
Check the red and blue wires on the VFD
connection at the control board. Is there a HZ
signal coming back between the red and blue
wires?
(100% fan speed should haver a signal of 778 Hz,
50% fan speed would be 530 Hz.)
No
Replace the motor.
Yes
Is airflow present coming through the jet plates?
No
Cool down oven to a safe temperature and
remove jet plates. Inspect the upper and
lower plates for cleanliness and obstructions.
Yes
The motor is running.

Alto-Shaam Vector VMC-H2 Specifications

General

Brand	Alto-Shaam
Model	Vector VMC-H2
Category	Oven
Language	English