SICK DUSTHUNTER T - Page 268

FLOWSIC100 Operating Instructions
Gas Velocity Monitor
Assembly and Installation
76 © SICK MAIHAK GmbH · Germany · All rights reserved 88012513/03-2008
Connecting/Commissioning the Optional Purge-air Unit
‡ Compare the supply voltage and frequency with those specified on the rating plate of the
purge-air motor.
ATTENTION
Important
Do not connect the purge-air unit if the values do not match.
‡ Connect the power supply cable to the terminals on the purge-air motor (see supplemen-
tary sheet on purge-air motor and cover of motor terminal box; see the connection arran-
gement shown in Fig. 3.20).
‡ Connect a protective conductor to the terminal.
‡ Set the motor circuit-breakers in accordance with the connection data of the fan (see
technical data of purge-air unit) to a value 10% greater than the rated current.
‡ Check the functioning and running direction of the fan (flow direction of the purge-air unit
must match the arrows at the inlet and outlet openings on the fan). If the direction of run-
ning on 3-phase motors is incorrect, swap power connections L1 and L2.
‡ Connect the (optional) pressure monitor for monitoring the purge-air supply.
Important
ATTENTION
‡ Use a fail-safe power supply (emergency power supply, bar with redundant supply)
‡ The purge-air unit must be fused separately from the other system components. The fuse
type must match the rated current (see technical details of purge-air unit). Fuse each
phase separately. Provide circuit-breakers to protect against a phase failure on one side.
If you are in doubt, or if you are using a special motor version, the operating instructions sup-
plied with the motor should take priority over any other information.
Fig. 3.20: Electrical connections for the purge-air unit
Power supply
4 x 1.5 mm
2
L1 L1
U1 U1
U1
U1
V1 V1
V1
V1
W1 W1
W1
W1
PE PE
W2 W2
W2
W2
V2 V2
V2
V2
U2 U2
U2
U2
L2 L2
+
24 V
L3 L3
_
PE PE
Low-pressure sensor
delta connection star connection
Fan motor in
Installed by
customer
Motor
circuit-
breaker