Merrychef eikon e4s - Manual (Page 37)

Service & Parts Manual original Instructions
Part Number 32Z3871 US
Issue 3
37
TESTING
C
OMPONENT
S
A
1
2
3
3 2
U
L1
DC
1
2
3
4
5
6
7
8
9
10
V
L2/N
W
L3
PE
64
67
66
68
65
17.2 Convection Fan Motor & Controller
17.2.1 Convection Fan Motor.
The convection motor Is a 3-phase AC motor having
a maximum speed of 7200 rpm controlled by a
motor speed controller.
The windings are thermally protected and in the
event of a thermal fault a trip inside the motor will
operate and shut down the motor speed controller.
17.2.2 Motor Controller
Provides a 3-phase AC switched mode drive to the
convection motor and is controlled by a 0 - 10 Volt
signal from the SRB. This allows the motor to be
adjusted from approximately 1500 rpm to 7000 rpm
in steps of 5%.
§
Door Open, 1500 RPM (20% @ 2V)
§
Door Closed (not cooking), 2190 RPM (31% @
3.1V)
§
Door Closed (cooking), speed as specifi ed by
program or setting up to a Maximum of 7000
RPM, 100% @ 10V)
17.2.3 LED Status display (A):
§ Inverter Off /No supply, LED OFF.
§ Power On/Ready, LED fl ashes ON/OFF x1 per
second.
§ Inverter Running, LED ON continuously.
§ General Warning, LED ON/OFF x2 per second.
§ Fault Condition, LED ON/OFF x10 per second.
Convection Fan Motor & Controller tests:
17.2.4 Disconnect and isolate the oven from the
electricity supply.
17.2.5 Allow the oven to cool down.
17.2.6 Remove the oven casing.
17.2.7 Ensure that the High Voltage Capacitor is
discharged before commencing work.
17.2.8 Check the following:
1 Electrical supply into motor controller.
2 Three phase connections to motor.
3 Speed Controller connections to SRB.
4 Motor thermal cut-out (short circuit).
5 Motor rotates freely/not seized.
6 Motor winding resistances:
§
Blue-Black 3 - 4 Ohms.
§ Black-Brown 3 - 4 Ohms.
§ Brown-Blue 3 - 4 Ohms.
§ Black or Brown or Blue to Earth (Open circuit).