Operating and Maintenance Instructions
210-OMI13277_Iss1.doc
ORIGINAL INSTRUCTIONS
Page 12 of 15
© ebm-papst UK Ltd, 2012
Chelmsford Business Park Chelmsford Essex CM2 5EZ
Telephone: +44(0)1245468555 Fax: +44(0)1245466336
e-mail
CN1090
Controller Operation, General: Run Enable Inputs, LED’s, Relays, Power-up Check
Fan Run Control:
Run Enable
: Fans will not run unless
both
run enable signals (Switched Live
and
Volt Free) are active. LED “En”
will be illuminated if Run enabled, LED will flash mostly off if not. Unit is shipped with both enables linked.
Fan Monitor:
“FAN1” and “FAN2” LEDS, Green LED = Fan Running at 20% speed or above, Red LED = Fan Alarm
Alarm Relay:
Alarm Relay output: Contacts closed = No Alarm, Contacts Open = Fan Alarm or Power Fail.
Fan Run Relay:
Fan Run Relay output: Contacts closed = Fan Running at 20% speed or above, Contacts Open = Not Running.
Fan Maximum Speed Relay (Change-over contacts):
Fan Maximum Speed Relay: Relay Energised = fan below maximum speed setting, Relay De-energised = fan at
maximum speed setting (may indicate Filter Block on a filtered system).
Power-up Check
At power-up all LED’s will illuminate and Relays energise for a few seconds. The fan run will be checked unless
“Fan Stop” is selected.
Maintenance and Servicing
The PCB has no replaceable parts, if a fault develops return the PCB to the manufacturer.
Use of ebm-papst RM-ECv Controller for local manual control
The ebm-papst RM-ECv Controller can be used to provide a 0-10V manually adjustable control voltage,
when supplied from the CN1090 controller “24VDC Unregulated Output, 25mA maximum, sensor supply”.
This is achieved by adjusting the RM-ECv “High” trimmer to give an RM-ECv output of 10V when the main
potentiometer is set fully Clockwise, and adjusting the RM-ECv “Low” trimmer to give an RM-ECv output of 0V
when the main potentiometer is set fully Counter-Clockwise. The RM-ECv trimmers can also be adjusted to limit
the control range if required. For details see the RM-ECv Controller instructions 210-OMI11358, available from
the em-papst web site,
www.ebmpapst.co.uk/instructions
