Welbilt MERRYCHEF conneX Service & Repair Manual page 27

3 Technical data
Description Features
Cooling Fan Supplies fresh air into
the component
chamber to cool down
the electrical
components. The fan
should run counter
clockwise (looking
down from above). The
fan will continue to run
until the oven is
switched off after
cleaning cycle.
Motor has internal
Thermal Overload
Protection on the Live
Cooling Fan Capacitor Connects to the cooling
fan at the connection
plug
Stirrer Motor(s) Mounts directly on the
wave guide above the
cavity, supply voltage
connected directly
from the IO Board.
Driving the stirrer
antennae in the horn
area of the microwave
launch on the cavity,
through the gear
assembly
VFD Takes 1PH AC supply
(Motor Speed voltage and produces a
Controller) 3PH DC square wave
frequency output.
3ph fan supply
protected individually
by 3x 5A ceramic on
board fuses.
Merrychef conneX ® service and repair manual
Function Rating
Supplies fresh air into 230VAC, 0.23A 52W @
the component
50Hz / 0.3A 70W @
chamber to keep the 60Hz
electrical components Resistance: 198 - 222Ω
cool. Fan should run (222Ω across
counter clockwise. connection terminals).
Capacitor 1.5µF
Draws air in through
the filter under the
door and out the rear
of the oven
Stores and discharges 400V, -25/70
voltage to start and run ±5%
the cooling fan motor
Drives a stirrer 230VAC 2.7W.
antenna to evenly Resistance 7 – 8kΩ
distribute or scatter
microwaves into the
oven cavity
Provides an DC, 3- 1ph power supply.
phase switched mode Control Signal Voltage
drive to the AC 10VDC output to the IO
convection motor and Board, 2-10VDC return
is controlled by a 0-10 to determine speed
VDC signal from the percentage of
relay board (IO). The convection fan motor
frequency output (2-7.5VDC on 16A/13A
allows the Main Blower ovens). Output 3ph DC
Motor to run at square wave frequency
variable speeds voltage
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Trouble shooting
Check operation in
Diagnostic View
Check for opens, shorts
or grounds
Check for locked rotor
(Power Off)
Check IO connection
X110
Check IO LED28
Check for Live supply
potential on fan
connection
Check Event Log for IO
& UI temperatures and
E103 events
C, 1.5µF Check for proper
o
microfarads.
Check for opens,
shorts, or grounds.
Warning: Capacitor
may have a stored
charge, discharge
before testing
Check for opens, shorts
or grounds
Check for locked rotor
(Power Off)
Check IO Board spade
connections X112
Check IO LED27
Check for Live supply
potential at IO X112
pins 1-2 & 3-4
Check electrical
connection
Check IO Board
connections X113 &
X519
Check IO LED29
Check VFD LED
sequence. Check for
10VDC at pins P2
(Green) & P3 (Blue).
Check for 1-10VDC at
pins P1 (Red) & P3
(Blue)
Check Live supply
potential on VFD
Check for consistent
output voltage
between each phase
between Blue (U), Red
(V) & Yellow (W) (Digital
multi-meter should be
set to VAC to conduct
this check)
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