Control Options In Monitor & Control Mode; 0-10V Input Control Option Using A Potentiometer And 10Vdc Supply From The Fans; Figure 11 - Typical Wiring Diagram For Monitor & Control Operating Mode - Potentiometer Control Signal And Fan 10Vdc Supply - Ebmpapst CN1116 Operating And Maintenance Instructions Manual

Operating and Maintenance Instructions
5.4.1.3 Control options in Monitor & Control mode
The MDC can be configured to respond to each of the three control options individually or in a combination.
One Control input
If only one control option is selected it will only respond to the output from the source specified (i.e. if keypad control
is specified, the MDC will respond only to a change made at the keypad).
Multiple Control Inputs
There may be a requirement for more than one control input option, such as in the case of manual override. The
MDC can select either two of the three options or all three options to change the speed of the fan array. Using
multiple control inputs prioritises the last instruction received.
Example: with the controller configured to receive control signals from all three sources:
•
Using a potentiometer, the control signal is adjusted to 3.5V - fans run at 35% speed
•
The BMS then writes a value of 50 to the MDC's Holding Register 4 – fans increase speed to 50%
•
The keypad is then used to slow the fans to 20% speed – the fans decrease their speed to 20%
•
The BMS writes 70 to the MDC's Holding Register 4 – the fans accelerate to 70% speed, etc
When Multiple control inputs are being used and the 0-10V Input control is included as an option, the voltage
level at the 0-10V input terminals of the controller will take priority if the controller is power cycled. In case of
such a power cycle, and if the potentiometer or control signal being used to provide the 0-10V input signal to
the controller has an output voltage of 0V, the controller will instruct the fans to stop. The fans will remain off
until the 0-10V control signal changes or until the MDC receives a run signal from one of the other control
inputs.
See H8 – Operation Mode - Monitor & Control for how to enter Monitor & Control mode.

5.4.2.1 0-10V Input control option using a potentiometer and 10VDC supply from the fans

Figure 11 - Typical wiring diagram for Monitor & Control operating mode – potentiometer control signal and fan
10VDC supply
210-OMI14229-Iss2
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Operation & Maintenance Instructions
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