Remote Switching; Fan-Fail Detection By Fault Sensing; Outputs; Analog Switch Outputs - S&P MULTI-REG CONTROL 2841 Series Manual

3.3.

Remote Switching


The switching between the (up to) three speeds can be activated by either:

(Up to) Three Volt-free contacts, or

(Up to) Three 230V supply inputs

On/Off – Volt-Free Contact and/or 230V

External Fire Fan Shut-Off Switch – An external "Fire" switch (Volt-Free) can be connected, If the
switch opens signifying that the fire alarm has been activated, then the MULTI-REG Controller will
automatically stop the fan.
3.4.

Fan-Fail Detection by Fault Sensing


Automatic monitoring of the impeller rotation via the Tacho pulse (frequency generator) signal.

Low current sensing to indicate a connection open circuit problem.

Sixty seconds time-delay of fault detection on start-up to allow input levels to normalise.

Facility to connect an Airflow Switch or Differential Pressure Switch (DPS), for use on fans where
other options are not practical. There is approximately a 60 seconds delay in the operation of the
airflow switch monitoring system, to allow full airflow to develop.
3.5.

Outputs


Digital Display

Running, Stopped and/or fault condition.

Fan speed percentage and 0-10V output condition.

Countdown to fault status monitoring condition (allows fan to gain speed).

Diagnostic – Reasons for fan stop/fail.
3.6.

Analog Switch Outputs


Output to BMS of fan run and fault indicated by an individual set of contacts capable of controlling
a maximum load of up to 230 Volts at 8 Amps.

Provision to operate a system damper actuator (can be supplied as an accessory). When the fan
is running, the damper opens, when the fan is stopped (either intentionally or in a fault condition)
the actuator spring return facility closes the damper.

4. SAFETY RULES

4.1.

WARNING

 Mains voltage is present. It is the responsibility of the user to ensure compliance with the Health
and Safety at Work Act, 1974.
 Isolate mains supply before connecting.
4.2.

CAUTION

 This unit must be earthed.
 All electrical connections should be made by a qualified electrician.
 All wiring must be in accordance with current wiring regulations. The control should be provided
with a separate double pole isolator switch.
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