Bard MEGA-TEC W090A, Service Instructions Manual

Page: 57 / 159

Manual 2100-671C
Page 55 of 59
that plugs into the expansion module
(C.PCOe). Is the expansion module
(C.PCOe) online?
a. Yes. Verify the blower and fan are still
online and proceed to Step 9.
b. No. Check wiring very carefully to
confirm no opens, shorts or grounding
has occurred. If unable to establish
communication with the expansion
module (C.PCOe) with the blower
and condenser fan online, with
address set and polarity verified,
the expansion module (C.PCOe) will
need to be replaced. To verify the
expansion module (C.PCOe) is faulty,
the communication wires should
be isolated from the blower and
condenser fan and only connected to
the PLC to establish if communication
is possible. If the procedure above
has been followed correctly, then
the expansion module (C.PCOe) will
remain offline. If this is not the case,
then wires leading to the condenser
fan and blower should be able to be
reconnected and communication
established.
9. Replace all covers, tidy up the wiring, clear alarms
and resume operations.