General information
Page 4
RES-403
Version 1
1.4
Impulse transformer
A suitable impulse transformer is necessary in order to guarantee trouble-free operation of the control loop. This
transformer must be designed according to EN 61558 or UL 5058 (isolating transformer with reinforced insulation)
and have a one section bobbin. When the impulse transformer is installed, suitable touch protection must be
provided in accordance with the national installation regulations for electrical equipment. In addition to this, water,
cleaning solutions and conductive fluids must be prevented from seeping into the transformer.
Incorrect installation of the impulse transformer impairs electrical safety.
1.5
Current transformer PEX-W4/-W5
The current transformer supplied with the RESISTRON
®
temperature controller is an integral part of the control
system.
Only the original ROPEX PEX-W4 or PEX-W5 current transformer may be used. Other transformers may cause
the equipment to malfunction.
The current transformer may only be operated if it is correctly connected to the RESISTRON
®
temperature
controller (see section "Startup and operation"). The relevant safety instructions contained in section "Power
supply", must be observed. External monitoring modules can be used in order to additionally increase operating
safety. They are not included in the scope of supply of the standard control system and are described in a separate
document.
1.6
Line filter
ROPEX provides line filters in different power classes. The ROPEX application report lists the suitable line filter
which can be ordered accordingly.
The use of an original ROPEX line filter is mandatory in order to comply with the directives mentioned in section
"DECLARATION OF CONFORMITY" on page 6. This device must be installed and connected according to the
instructions contained in section "Power supply" as well as the separate documentation enclosed with the line
filter.
1.7
Maintenance
The controller requires no special maintenance. Regular inspection and / or tightening of the terminals – including
the terminals for the winding connections on the impulse transformer – is recommended. Dust deposits on the con-
troller can be removed with dry compressed air.
Dust deposits and dirt from liquids result in a loss of function. Accordingly, installation in a switch
cabinet or terminal cabined with IP54 is recommended.
1.8
Transportation
Store and transport the device in its original carton.
After transport, perform a visual inspection for possible damage.
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