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Operating and Maintenance Instructions
5.7 Advanced Settings Submenu
This submenu allows modification to different parameters of the controller and fans, depending on the selected
operating mode of the MDC.
•
RPM Limit (See H13 – Advanced Settings – RPM Limit)
The MDC will transmit a Modbus command via the RS485 network to set the maximum speed limit of the fans in
the array. This setting will be stored in non-volatile memory in the fans, after which the fans and controller will
perform a power reset to activate the new operating parameters. There are two options available in this sub-menu:
o RPM Limit All Fans
o RPM Limit Single Fan
•
0-10V Control Cap (See H14 – Advanced Settings – 0-10V Control Cap):
This option is only available when operating in "Monitor" mode.
o
o The MDC will transmit a Modbus command via the RS485 network to set the minimum and
maximum control input signal the fan will respond to. This value is broadcasted to all fans and
stored in their non-volatile memory followed by a power reset to activate the new parameters.
o The range of values are 0 to 9V for the minimum setpoint and 1V to 10V for the maximum setpoint
•
0-10V Input Cap (See H15 – Advanced Settings – 0-10V Input Cap):
This option is only available when operating in "Monitor & Control" mode.
o
o The MDC will store the minimum and maximum setpoints in its non-volatile memory, and will cap
the control signal received on its 0-10V input port accordingly
o The ranges of values are 0 to 9V for the minimum setpoint and 1V to 10V for the maximum
setpoint
•
Alarm Output: There are two options available on this submenu.
o From Fans (See H16 – Advanced Settings – Alarm Output (Sensor Disabled)
o From Sensor (See H17 – Advanced Settings – Alarm Output (Sensor Enabled)
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Custom RPM: Broadcasts a custom RPM to all fans
▪
Set to Max RPM: Read the maximum RPM limit of each fan and use this data to set
▪
each fan to its maximum RPM limit
▪
Provides a list of all fans and their individual RPM limits allowing to change the RPM
limit of individual fans
▪
Dictates what type of faults will cause the alarm output relay to open:
•
Alarms
•
Warnings
•
Alarms or Warnings
•
Relay Disabled (Default)
Available only when monitoring a sensor or when in constant volume / pressure
▪
operating mode
If monitoring a sensor, a threshold must be entered for the relay to open and the red
▪
LED to switch on when the sensor reading is below that threshold:
•
Example 1: Using a 500Pa sensor while monitoring pressure (metric) and
setting the sensor alarm threshold to 50%, the alarm will trigger when the
sensor reading is at 250Pa or below.
Operation & Maintenance Instructions
Chelmsford Business Park Chelmsford Essex CM2 5EZ
Telephone: +44(0)1245468555 Fax: +44(0)1245466336
e-mail
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