Inverter control
Under fire conditions the electrical supply must not run
through the inverter -
The inverter must be bypassed.
Where fans are connected to frequency inverter controls
the electrical supply to the fan must bypass the inverter
under fire conditions.
Installation and Maintenance
AXUS AXR High Temperature Axial Fans
5
Wiring
Customer/installer wiring to the termal box located on the fan
casing.
Single Speed Units with motors rated below 4kW
Are wired for D.O.L. starting only.
For safety reasons Nuaire recommends that all Smokefoil units
are wired for D.O.L. starting.
All two speed units must be wired for D.O.L. starting.
Note: Star /Delta starting is available but must only be used
where permitted by the appropriate approval authorities
Controls
A range of matching starters / controls are available.
Contact us to discuss your specific requirements.
Please specify D.O.L.or Star / Delta.
Testing Warning!
Before carring out any test, check that no loose items, tools etc.
are left inside the unit. The fan should not be operated with
panels removed. If this proves impractical (during testing for
example) ensure that all personnel are well clear of the unit.
Testing -
Switch on the fan unit for a sufficiently long period to
ensure that the impeller runs correctly. Switch off during the
rundown period check for correct direction of rotation and for
evidence of any fault as follows:-
a)
Check that impeller is rotating freely with no signs
of slipping.
b)
Check direction of rotation. A single phase unit is unlikely
to be incorrect, as the unit was carefully checked at works
prior to delivery. To change the direction of rotation on
a three phase unit simply reverse any two of the supply
connections in the isolator box.
Wiring Diagrams
S
L1 L2 L3
Single Speed 3 phase (below 4kW))
400V 3 phase 50Hz supply
Fan
unit
L
4
1U 1V 1W
L
U1
L
V1
L - W1
L
U1 - W2
L
V1 - U2
L - W1 - V2
L
W V U
4
Notes:
T
S
L N
S
L2 N L1
L
L2 N L1
L
L N L2 N N L1
L
L N L2 N N L1
L
L
L3 N N L2 U
V W
THREE PHASE UNITS
For specialist connections not shown always refer to the wiring diagram
supplied with the unit. In the event of query or uncertainty contact NUAIRE
directly
before
any connection is made.
S
S
L N
L1 L2 L3
S
U1
V1
W1
W2
U2
V2
3 phase for connection to a
STAR /DELTA STARTER (4kW and above)
2
400V 3 phase 50Hz supply
STAR
L1 - U1
L2 - V1
L3 - W1
Link W2, U2, V2
DELTA
L1 - U1 - W2
L2 - V1 - U2
L3 - W1 - V2
L1 L/L2 N/L3 PE/
W V U
400V 3 phase 50Hz supply
3 Phase only
INVERTER SPEED CONTROL
Connections
to motor
3 Phase input
Motor
3 phase
Notes:
Total length of motor leads should not exceed 50 metres.
If a screened motor cable is used, maximum length should
be 25 metres. Consult our Technical Department if you
wish to use longer leads.
Inverters are configured to suit specific fans and control
applications as described on the Customer Order
free of charge.
Matched Frequency Inverter
N
S
L N
S
Note:
For all D.O.L. (Direct On Line)
operation or Inverter type Speed Control
wire in DELTA
L2 N L1
L
L2 N L1
L
L N L2 N N L1
L
L N L2 N N L1
L
L2 L3
4
N L2 U
V W
3 phase for DOL STARTING
(4kW and above)
400V 3 phase 50Hz supply
U1
V1
W1
W2
U2
V2
L1
L2
L3
S
2 SPEED TAP/PAM WOUND MOTORS
(D.O.L. starting both speeds)
400V 3 phase 50Hz supply
4
1U
1V
1W
2U
2V
2W
Motor
terminal
box
NOTE:
HIGH SPEED
- Supply: 2U 2V 2W
LINK 1U 1V 1W
LOW SPEED
-Supply: 1U 1V 1W
S
PE/ W V U
4
Notes:
T
Consult our Technical Dep
Note: individual
wiring instructions
are included with
each unit
L2 N L1
L
L2 N L1
L
L N L2 N N L1
L
L N L2 N N L1
L
N L2 U
V W
For DUAL WOUND motors call Nuaire for details
2
08. 05. 1
7. Leaflet Number 671063