TurboChef Technologies 2020 - Manual (Page 41)

2 3
OVEN SY
STEMS
The Conveyor System
This section contains information about the
following components, as well as testing
procedures:
- Gear Drive (Conveyor Motor)
- Gear Drive (Conveyor Motor) Speed
Controller (CMSC)
Gear Drive (Conveyor Motor)
The conveyor motor is a 1610 RPM, 3-phase
motor with a built-in Hall Effect Sensor. The
speed of the conveyor motor is controlled by the
voltage frequency applied to the windings from
the CMSC. The Hall Effect Sensor sends a DC
pulse back to the control board to verify motor
speed. The control board uses these pulses to
determine the output DC voltage to the
CMSC.
Single-belt HhC 2020 ovens contain one gear
drive. Dual-belt ovens contains two gear drives.
Testing Procedure
1. Disconnect line voltage from the unit.
2. Take a resistance reading of the motor
windings and use Figure 33 to verify that
the resistance readings are correct.
3. If the resistance readings are correct,
reconnect the motor wiring and then apply
line voltage to the unit and check for
voltage applied to the motor windings.
4. If no voltage is present, ensure the CMSC is
operating properly (see below).
5. If CMSC is operating properly, inspect the
wire harness for damage or shorts.
6. If the wire harness is intact and undamaged,
and the CMSC is operating properly, the
gear drive is damaged or defective and must
be replaced.
Gear Drive (Conveyor Motor) Speed
Controller (CMSC)
The CMSC converts single-phase line voltage to
a three-phase output, and controls the speed of
the gear drive via frequency output. The CMSC
receives an input voltage (0-10 VDC) from the
control board and adjusts the frequency output
to the gear drive.
Testing Procedure
WARNING: Capacitors within the CMSC
can retain charge after power is removed.
Exercise extreme caution when handling the
terminals.
WARNING: DO NOT connect incoming
AC power to output terminals U, V, or W.
This will seriously damage the Conveyor
Motor Speed Controller.
1. Ensure that no faults appear on the display
of the CMSC during oven operation. The
control will display the frequency output if
the system is operating correctly.
2. Check the input voltage on terminals L1 &
L2 (200-240 VAC) and the DC voltage
input on terminals 0V & AI (0.1-10 VDC).
3. If no input voltage is present, inspect the
wire harness for damage or shorts (pages
37-38).
4. If DC control voltage is not present, check
voltage output at I/O board. If no voltage is
present at the I/O board, replace the board.
J10-A13 to J9-C6 = front belt
J10-A14 to J10-A6 = rear belt.
5. Check ohms of motor (Figure 33).
6. If wire harness is intact and undamaged,
the CMSC is damaged or defective and
must be replaced.
To From Description Expected Resistance
White Grey Winding (A-B) 215-217
W
White Black Winding (A-C) 215-217
W
Grey Black Winding (B-C) 215-217
W
White, Grey, or
Black
Green
Windings to
chassis
Open
Figure 33: Conveyor Motor Ohm Chart