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5.6
Actuator (SQM48.4....)
Warning notes
To avoid injury to persons, damage to property or the environment, the following warning notes should be observed!
Do not open, interfere with or modify the actuators!
All activities (mounting, installation and service work, etc.) must be performed by qualified staff.
Before making any wiring changes in the connection area of the SQM4..., completely isolate the burner control from the mains
supply (all-polar disconnection).
Ensure protection against electric shock hazard by providing adequate protection for the connection terminals and by securing
the housing cover.
Check to ensure that wiring is in an orderly state.
Fall or shock can adversely affect the safety functions. Such units must not be put into operation, even if they do not exhibit
any damage.
Mounting notes
•
Ensure that the relevant national safety regulations are complied with.
•
The connection between actuator drive shaft and controlling element must be rigid with no mechanical play.
•
To avoid inadmissible loads on bearings caused by rigid hubs, it is recommended to use compensating clutches with no me-
chanical play (e.g. metal bellows clutches).
Installation notes
• Always run the high-voltage ignition cables separate from the unit and other cables while observing the greatest possible dis-
tance.
• 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 contact. This protective cover must not be
removed! The underside side of the board must not be touched.
Attention: When servicing or replacing the actuators, take care not to invert the connectors.
18
5
CHAPTER
Preparation for start up
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