Sequence Of Operation - Blodgett Combi Manual Control BCM Service & Installation Manual

BLODGETT OVEN COMBI
Sequence of Operation for BCP and BCM (electric)
You will have AC voltage at:
• The bottom of the main contactor (T1, T2, T3)
• Fuse F5 in the front
• The transformer (T1) in the front of the oven
• Fuse F1, F2, F3 and F4 in the front
• On the CPU and the IO board (J10 pin 5 and 6)
There are no DC voltage when the unit is turned OFF
• The boot logo appear on the screen for about 30 sec. then ready to
operate (only BCP)
• Light will come on after 30 sec.(only BCP) (12 VAC between J9 pin 3 and
terminal 1)
• The exhaust valve will "open" and "close" after 30 sec. (24 VAC between
J2 pin 12 and terminal 1) (Ground J2 pin 15 when closed)
The IO board verifies the following with DC voltage:
• The door sensor SE1 is closed sending either towards 0 or towards 5
DC voltage to J1 pin 34 depending on the pole of the magnet.
• With door sensor SE1 open the DC voltage is 2,5 on J1 pin 34.
The IO board verifies the following with AC voltage:
• The high limit stat of the motor is closed sending 24 VAC to J1 pin 10
• The high limit stat of the oven is closed sending 24 VAC to J1 pin 9
• The high limit stat of the boiler is closed sending 24 VAC to J1pin 12
• The high limit stat of the SSR closed sending 24 VAC to J1 pin 13
• Main contactor K1 is activated (24 VAC on coil of contactor A1 and A2)
output from IO board is coming from plug J2 pin 2 going through all the
high limit stats and to the coil.
• When the main contactor is activated the terminal L4 on the contactor
provides power to the frequency inverter (terminal L/R) which controls
the motor M1.
• The IO board makes a connection between J2 pin 28 and 27 to terminal
+12V, and Start, this will start the fan.
• The speed of the fan depends of the DC voltage on terminal Com and
Speed of the inverter (IO board J2 pin 33 and 34) 0 – 10 VDC
• The motor reverses direction every 2 minutes by making a connection to
the terminal REV of the inverter (IO board J2 pin 29) +12VDC
Unit is turned "OFF"
Unit is turned "ON"
When a mode is started
1