Merrychef conneX 12e - Page 25

3 Technical data
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Merrychef conneX
®
service and repair manual
25
Technical data, checks and verification.
Description
Features
Function
Rating
Trouble shooting
Fuses
Ceramic Time Delay
Supplies voltage from
the VFD to the
convection fan motor.
3 x 6.3 Amp
Check continuity
through fuse.
Check fuse holder for
cracks.
Check for line potential
on both terminals of
fuse holder.
Door Open message
displayed when F5 or
F6 has failed open
circuit. No functionality
when F1 or F2 has
failed open circuit.
Fuse F1 & F2
Ceramic BS1362
Control Circuit supplies
voltage to the LV
transformer and
auxiliary components.
2 x 13 Amp
*(12 Amp see note 1)
Fuse F3 & F4
Ceramic Time Delay
Heater Circuit, supplies
voltage to the IO for
the heating elements.
2 x 20 Amp
Fuse F5 & F6
Ceramic Time Delay
Microwave Circuit,
supplies voltage to the
IO Board and HV
components through
the interlock switches.
2 x 20 Amp
Fuse F7
Ceramic BS1362
Switched Mode Power
Supply (SMPS)
Protection.
3 Amp
Door Interlock Switches
Common, Normally
Open and Normally
Closed terminals;
RHS SW1 Monitor
(outer, C to NC)
RHS SW2 Secondary
(inner, C to NO)
LHS SW3 Primary (C to
NO)
Door Open message
displayed when SW3 is
open.
Door switches are for
safety, and they prove
the oven door is
physically closed or
open. The microwave
circuit will not be
energized if the door is
open. Live runs
.through these
switches. See correct
switch sequence
below.
SW1 & SW2: 250VAC
22A
SW3: 250VAC 20A (up
to 75A inrush)
Check operation in
Diagnostic View
Check F5 & F6
Check for
continuity.
Check for proper wiring
Check for proper
adjustments.
Check for physical
damage such as bent
activating tabs (see
section 6.5 ‘Adjusting
the door
microswitches’)
Check IO Board
connections X400,
X401, X402 and X412
Check IO LED 6.
Check for line potential
on SW3 NO.
EMI Filters
(Mains Filters)
These filters
extract any
unwanted
current
conducted
through
wiring or
cables.
Filters unwanted
frequency noise from
interfering with various
circuits and
components in the
oven.
For use on the main
supply feeding all
branch circuits.
115/250VAC 50/60Hz
20A @ 40
o
C
Line (L&N) or Load
(L’&N’) = 330kΩ
L1 (L&L’) or L2 (N&N’) =
0Ω
Ground (G&L), (G&N),
(G&L’), (G&N’) = open
Check for signs of
overheating or dis-
colouration.
Check for shorts to
ground from all Live
and Neutral terminals.
Check for steady
voltage (Live & Neutral)
to the filter.
Check for steady
voltage (Live & Neutral)
out of the filter.
Switch Mode Power
Supply (SMPS).
Low voltage supply to
the main PCB, (IO
Board).
M3.5 screw
connections.
Pre-set output voltage
adjustment.
LED self-test indicator.
Provides a stepped
down rectified voltage
of 12VDC to the IO for
controller operation.
Input Voltage 100 -
240VAC 50/60Hz 2.1A
Output Voltage 12VDC
/ 8.5A @ 50
o
C.
Check LED 1
Check IO +12V LED
Check PSM
connections.
Check IO Board
connections X100, X101
and X500.
Check input voltage.
Check output voltage.