GB
54
1.1.1 Special conditions (Ex-RM1m B 230 V)
As a protection against short circuits, a fusing of appropriate rating (max. 3 x I
B
according to DIN 41571 or IEC
127) for the designed current rating, or a starting circuit-breaker with short-circuit and instantaneous thermal
(set to the design current) release, must be connected in series for each relay module Ex-RM1. This fuse either
can be positioned in the appropriate power supply or has to be connected before the device. The fuse-design
current must be equal to or greater than the given voltage rating for the relay module. The breaking capacity of the
fuse used must be equal to or greater than the maximum short-circuit current (normally 1500 A) that can be
assumed for the location of installation.
If the pump and the valve are protected in the connecting compartment of the relay module from short circuits,
then the design voltage for the fuse must be equal to or greater than the given voltage rating for the pump or
valve. The breaking capacity of the fuse used must be equal to or greater than the maximum short-circuit current
(normally 1500 A) that can be assumed for the location of installation. If the breaking capacity of the installed
fuse differs from this, then the value for the maximum admissible short-circuit current shall be indicated on the
relay module.
2. Installation
2.1 Installation location
The relay module Ex-RM1m can be mounted to the lower body of the flow meter or to any permanent base
(e.g. wall, mounting plate). The upper connection of the relay module forms part of a further module from the
system. The completely mounted system meets the requirements of protection class IP 54.
Caution!
The electromagnetic compatibility of the device is compatible with the emitted interference and
interference immunity for residential and industrial areas. To avoid interfering influences in a
decentralised installation of individual modules, only use data cables from the Lutz company and route
the data cables separate from low-voltage lines.
E. Relay module Ex-RM1m
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