Operating and Maintenance Instructions
210-OMI14229-Iss8.1
CN1116 Full OMI
Page 16 of 47
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The wiring diagram for this control mode is shown below:
Figure 12 - Wiring diagram for Monitor & Control operating mode - Modbus RS485 control signal
CAUTION:
Risk of damaging the fans if two power supplies are connected at the same time:
Do not connect
fans’ 10VDC
output to the controller if the controller is powered from an external power
supply.
5.4.3 Controlling the fan array
speed using the controller’s keypad
(Keypad Control Mode)
A
new submenu called “Set Speed”
will become available inside the Main Menu where it is possible to set the speed
setpoint using the keypad. See
Operation Mode - Monitor & Control
. Use the UP and
DOWN buttons to change the speed setpoint in steps of 1%, or hold the ENTER button and then use the UP and
DOWN buttons to change the speed setpoint in steps of 25%.
The wiring diagram for this control mode is shown below:
Figure 13 - Wiring diagram for Monitor & Control operating mode
–
keypad control
CAUTION:
Risk of damaging the fans if two power supplies are connected at the same time:
Do not connect
fans’ 10VDC
output to the controller if the controller is powered from an external power
supply.
5.4.4 Measuring fan performance using one or multiple pressure sensors
When
“
Monitor & Control
”
operating mode is selected, it is possible to monitor a 0-10V differential pressure sensor
connected to the 0-10V input of the controller or to the 0-10V input of the fan.
Select “Enabled” when the “Sensor
Monitor” screen appears during the configuration of the operating mode. Then select the “Sensor Input” to either
“Controller” or “Fan”.
Please note that if the selected “Sensor Input” is set to “Controller”, the 0
-10V control mode
will become unavailable.
