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Operating and Maintenance Instructions
CAUTION: Risk of damaging the sensor if the controller's power supply voltage exceeds the maximum
Check the sensor voltage input rating before connecting it to the controller.
CAUTION: Risk of damaging the controller's 0-10V input. Any signals higher than 10V may damage the 0-
Check the sensor voltage output range before connecting it to the controller.
5.4 Monitor & control mode
In "Monitor & Control" operating mode the fans no longer respond to a separate speed signal i.e. a 0-10V analogue
signal connected to the analogue input terminal of each fan. Instead, all fans are automatically configured to
Modbus speed control and receive the same speed setpoint from the controller via Modbus. The speed setpoint is
based on inputs at the controller which are called "control modes".
The controller supports three control modes: 0-10V, Modbus and Keypad and it is possible to set the controller to
respond to each control mode individually or in a combination:
Single Control Option
If only one control mode is selected the controller will only respond to the output from the source specified i.e. if
keypad control mode is specified, the controller will respond only to a speed setpoint change made at the keypad.
Multiple Control Options
There may be a requirement for more than one control mode option, such as in the case of manual override. Using
multiple control modes prioritises the last instruction received.
Below an example of a sequence of events taking place to control the speed setpoint when all three control
modes have been selected:
1)
A 3.5V signal is connected to the 0-10V input of the controller - fans run at 35% speed.
2) An external Modbus Master device connected to the controller's Modbus Slave Port writes a value of 50
to the controller's Holding Register 4 - fans increase speed to 50%
3) The controller's keypad is then used to slow the fans to 20% speed - the fans decrease their speed to
20%.
4) The external Modbus Master device writes 70 to the controller's Holding Register 4 - the fans accelerate
to 70% speed, etc.
If the speed setpoint is changed using the controller's keypad or the 0-10V input control mode, the latest
setpoint is recalled by the controller in the event of a power cycle. However, this does not apply in case the
speed setpoint is changed using the Modbus control mode unless the "Save Modbus Control Speed Setpoint"
5.4.1 Controlling the fan array speed using the controller's 0-10V input (0-10V Control Mode)
The controller responds to a 0-10V signal connected to its 0-10V input terminal. This can be from either an external
system or from a 10kΩ potentiometer connected to a +10VDC supply. The controller has a dedicated 10V output
if required hence there are three possible wiring diagrams for the 0-10V control mode:
210-OMI14229-Iss8.1
© ebm-papst UK Ltd 2021
voltage input of the sensor. All "+" controller terminals are common.
10V input of the controller.
register has been set.
CN1116 Full OMI
Chelmsford Business Park Chelmsford Essex CM2 5EZ
Telephone: +44(0)1245468555 Fax: +44(0)1245466336
e-mail
sales@uk.ebmpapst.com
IMPORTANT
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