C.M.C. n.v. - Airmaster R1 installation guide – base unit – V1.1 – MANY0317A.00
Page 14 of 41
The contacts of the Airmaster R1 relays must only be used in conjunction with a
control circuit transformer (Class 1, UL506), except if a voltage less than 30Vrms is
used with a limited energy rating. In the last case a Class 2 transformer is also
allowed.
The secondary circuit of the control transformer can be grounded without damage to
the Airmaster R1 controller.
A suitable UL508 branch circuit protection must be provided on the primary side of
the transformer. A supplemental fuse (in accordance with UL248 series) with a rating
of 4A ‘T’ type (slow blow) is obligated for the secondary side. In case of doubt
please contact the transformer supplier.
Please consult the text of the UL508A and/or UL508 standard for more explanation
regarding this item.
For the European market (CE)
The transformer or power supply must be in accordance with the current applicable
European directives (e.g. Low Voltage Directive and EMC directive). This means
that it must conform to the EN61558 standard
(
partly supersedes the older EN60742
standard) for the particular application. Also applicable are EN60204 (Safety of
machinery - Electrical equipment of machines) and EN60950. A CE marking must be
on the device.
The Airmaster R1 is a class I equipment in which protection against electric shock
does not rely on basic insulation only, but which includes an additional safety
precaution in that accessible conductive parts are connected to the protective earthing
conductor in the fixed wiring of the installation in such a way that they cannot
become live in the event of a failure of the basic insulation.
In the case of a proper grounding or earth connection an isolating transformer can be
used. However, if the chance exists that the earth connection can be disconnected
when the equipment is under voltage, a safety isolating transformer must be used.
Note that for EMC reasons an earth connection is obligatory.
The transformer or supply must be suitable for use in a standard industrial
environment.
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