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8009389/YN39/V3-0/2015-08| SICKOPERATING INSTRUCTIONS|GM35
Subject to change without notice
INSTALLATION
1 Check the type plate to determine whether the connection values of the purge air unit
delivered match the plant conditions.
2 Connect the power supply cable in the terminal box of the purge air unit as shown in
“Purge air unit: Electrical connections for blower motor and low-pressure monitor”. Note
that any differing connection diagrams supplied with the terminal box are valid.
3 Remove the seal at the end of the purge air hose (if present) to check whether the hose
functions correctly.
4 Switch the power supply on.
5 Does the motor rotation direction match the following attributes?
– Arrow marking on the motor cover
– Arrows on the pump housing
– A strong airstream must flow out of the purge air hose.
6 If the rotation direction is wrong:
▸ Switch the power supply off.
▸ Switch two phased wires in the supply line in the terminal box (e.g. between U1 and
V1).
▸ Switch the power supply back on.
▸ Make sure the rotation direction is now correct.
7 Set the motor circuit breakers in accordance with the connected loads of the purge air
blower and check for correct function.
8 Connect the low-pressure monitor for filter monitoring to the signal line prepared onsite.
Note The switching signal of the low-pressure monitor is evaluated by the customer.
▸ Check the low-pressure monitor function and the connected signal function:
Cover the suction opening partially for a short time when the purge air unit is running.
Use wide cardboard strips or something similar that cannot be sucked in or contaminate
the filter.
▸ Switch the purge air unit power supply off until measuring system start-up.
For installations outdoors or in unprotected conditions:
▸ Protect the opening of the purge air hose against moisture and contamination until the
measuring system is put into operation; refit any dummy plugs removed beforehand.
▸ Fit the weatherproof cover.
4.4.2 CAN bus wiring options
As already described in the project planning on
page 30, the following options are available
for wiring the CAN bus connection between SR-unit and evaluation unit:
• Standard cable, 4 m, prefabricated
• Standard cable, 4 m, as well as additional prefabricated 15 m CAN bus extension cable
• Terminal box with prefabricated 4 m long cable to SR-unit; a cable provided by the
customer is used to connect to the evaluation unit.
Information on selecting a suitable type of wiring can be found under
“Options for CAN bus
wiring”, page 25.
CAUTION: Possible damage when the purge air blower rotates in the wrong
direction
Rotation in the wrong direction suctions sample gas out of the duct when the
measuring system is installed. The following damage can incur when this is not
prevented quickly:
● Contamination and overheating of the measuring system and the purge air
unit.
● Health risks for persons in the vicinity of the purge air unit (depending on
sample gas composition and/or temperature).
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