Operating Mode; Protection Class; Mounting Position - SCHIEBEL AB3 Operating Instructions Manual

Operating Instructions for Actuators Type AB with Control Unit
OM-ENGLISH-ABCSC.V1.2-16xx-V2.02-2023.04.27
Figure 5: nameplate of the actuator for operation in
explosive atmosphere

2.3 Operating mode

There are two distinct modes of operation: open-loop control operation (operational mode S2 for ON-OFF)
and closed-loop control operation (operational mode S4) according to EN 60034-1. But since there is a great
number of varying and special models made to order, it is recommended to consult the motor model plate for
the mode of operation and the running time.

2.4 Protection class

Actuators with three-phase motors are standardly equipped with the IP 66 protection system (according to DIN-
Standard 40050). Explosion-proof actuators and actuators with plugs are furnished with the IP 65 protection
system. Exceptions are the AC, DC and brake-motor actuators as well as those for other protection systems
made to special order.
CAUTION: The protection class specified on the nameplate is
only effective when cable glands also provide the required protec-
tion class, the cover of the connection compartment is carefully
screwed and the mounting position (see section 2.5, page 7) is
observed.
We recommend metallic screwed cable glands with a metrical thread. Furthermore, cable inlets not be needed
must be closed with screw plugs. On explosion-proof actuators cable glands with protection class Ex e ac-
cording EN60079-7 must be used. After removing covers for assembly purposes or adjustment work, take
special care upon reassembly so that seals are not damaged and remain properly fastened. Improper assem-
bly may lead to water entrances and to failures of the actuator.
CAUTION: The cover of the control unit (see figure 1, page 6)
must not be opened!
Allow a certain sag in the connector cables before reaching the screwed cable glands so that water can drip
off from the connector cables without running to the screwed cable glands. As a result, forces acting on the
screwed cable glands are also reduced. (see section 2.5).

2.5 Mounting position

In principle, the installation position is irrelevant. However, based on practical experience, it is advisable to
consider the following for outdoors use or in splash zones:
• Mount actuators with cable inlet facing downwards
• Do not arrange the motor so that it hangs downwards
• Ensure that sufficient cable slack is available
Figure 6: nameplate of the SMARTCON control unit
for operation in explosive atmosphere
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