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Siemens Building Technologies
CC1N7814en
HVAC Products
31.10.2002
To ensure
degree of protection IP 54,
suitable Pg glands must be fitted in the actua-
tor’s Pg11 openings.
The Pg glands used must feature cable strain relief.
To ensure degree of protection IP 54 during the actuator’s entire service life, the bear-
ing of the drive shaft must be located such that it will not be directly exposed to water or
dust.
SQM4...
Mounting plate SQM4...
Secure coupling piece to drive shaft
such that intermediate plastic
piece has an axial play of about
0.2 to 0.5 mm
Mounting plate VKF41...
Spacer
VKF41...
78
14
z0
2e
/0
502
ASK33.4
Installation notes
·
Installation work must be carried out by qualified staff
·
Always run the high-voltage ignition cables separate from the unit and other cables
while observing the greatest possible distance
·
To ensure protection against electric shock hazard, make certain that the AC 230 V
section of the SQM4... is strictly segregated from the functional low-voltage section
·
The holding torque is reduced when the actuator’s power supply is switched off
The housing cover may only be removed for short periods of time for wiring or when
making the addressing. It must be made certain that dust or dirt will not get inside the
actuator while such work is carried out.
The actuator contains a printed circuit board with ESD-sensitive components.
The top side of the board carries a cover which affords protection against direct con-
tact. This protective cover may
not
be removed! The underside side of the board may
not be touched.
Addressing (assignment of functions) defines whether the SQM4... shall operate as a
·
fuel
actuator
·
air
damper
actuator,
or
·
auxiliary
actuator,
and is made with the display and operating unit AZL... and the addressing button on the
actuator, which is located under the housing cover (refer to Basic Documentation
P7550).
The correct assignment of actuator functions can be checked with the help of flashing
LEDs.
For the maximum permissible cable length, refer to the Basic Documentation.
Cabling must be strictly serial (
no branching permitted!
).
Commissioning notes
·
Commissioning work must be carried out by qualified staff
IP 54
Mounting example
Housing cover
ESD
Addressing
Cable length
Topology
