5
nuaire.co.uk
029 2085 8400
30. 04. 19. Leaflet Number 671220
Installation and Maintenance
AXUS Circular Long Cased Axial Flow Fans
4.4 Control Connections
4.4.1 Mains Connections
Mains cables should be suitably sized and terminated at terminals
shown on the appropriate diagram.
4.4.2 Control Connections
4.4.3 Switched Live (SL) terminal at the PCB
4.4.4 Damper Connections
OP -
230V 50Hz 1A max supply to open the damper.
CL -
230V 50Hz 1A max supply to close the damper.
N -
Neutral supply to damper.
RET -
230V ac return signal from the damper limit switch indicates the
damper has reached its operating position. If the return signal is not
present, the fan will wait for 1 minute before starting.
Note: If a damper is not fitted, connect a link wire from OP to RET. This
will cancel the delay.
4.4.5 Volt Free Relay Contacts
4.4.6 Data Cable Installation
A 4-core SELV data cable is used to connect devices.
Do not run data cable in the same conduit as the mains cables and
ensure there is a 50mm separation between the data cable and other
cables. The maximum cable run between any two devices is 300m
when it is installed in accordance with the instructions.
Please note that the total data cable length used in any system must
be less than 1000m. Keep the number of cable joints to a minimum to
ensure the best data transmission efficiency between devices.
4.4.7 Maximum Number Of Devices
The maximum number of devices (including fans) that can be
connected together via the cable is 32, irrespective of their functions.
4.4.8 Other Low Voltage Cables e.g. BMS Signal
Follow
the basic principle (as per section 4.4.6). Keep the
cable run as
short as possible, maximum cable length of 50m. If the cable is longer
than 12m, Nuaire recommend using screened cable with the screening
grounded at one end only (preferably at the inverter end).
4.4.9 Other Low Voltage Cables e.g. BMS Signal
Follow the basic principle (as per section 4.4.6). K
eep the cable run as
short as possible, maximum cable length of 50m. If the cable is longer
than 12m, Nuaire recommend using screened cable with the screening
grounded at one end only (preferably at the inverter end).
4.4.10 BMS Input Signals
The BMS connection is made with a plug-in connector
via the socket (see fig. 11).
To ensure the connection is made only by suitably
qualified and authorised personnel the plug is not
supplied.
It is available from R S Components,
Part No. 403-875 or Farnell, Part No. 963-021.
The system’s response to a 0-10V dc BMS signal is given in the
following table.
Note:
The BMS signal will override any sensors and user control connected in
the system. The voltage tolerance is +/- 125mV and is measured at the
fans terminal.
IMPORTANT
Reversal of the BMS connection will damage the
control.
Mains Connection
230V 50Hz 1 phase
N E
L
SL
Remove link if switched live signal,
an enabler or BMS signal is connected.
All wiring is 1Ph 230V 50Hz
230V
motor
S4
2
S6
1
RET
OP CL N
All wiring is 1Ph 230V 50Hz
230V
motor
RET
N
CL
OP
White
Brown
Blue
A fan starting
delay of 1 minute
is imposed to
enable the damper
to open.
To override the
delay, fit a link here
A fan starting
delay of 1 minute
is imposed to
enable the damper
to open.
To override the
delay, fit a link here
Fault Signal
FAULT
Run Signal
RUN
0V
0 -
10
V
BMS
Figure 6. ‘Net’
connection
for Ecosmart
devices.
Figure 7.
Net -
The 4 IDC plug-in connectors are provided for the connection of
compatible sensors, manual controls and for linking the fans together
under a common control. If more than 4 connections are required,
the junction box (product code ES-JB) should be used (data cable
installation).
A signal of 100-230V a.c. will activate the fan from either its off state
or trickle state (see setting to work-trickle switch). When the SL is
disconnected the fan will over-run for 1
– 60 minutes (see fig. 12).
Do not take this signal from an isolating transformer.
Figure 8. Drive
Open / Spring close.
Figure 9. Drive
Open / Drive Close
Figure 10.
Note that the volt free contacts are not fused. If these are used to
power any external equipment, the installer must provide adequate
fusing or other protections.
These contacts are rated at 5A resistive, 0.5A inductive.
Run connections -
These contacts are closed when the fan is running.
Fault connections -
No fault = the contacts are closed.
Fault = the contacts are opened.
Figure 11.
