2. Safety
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104781 - MRF-2 | MRH-2 - V2.4 - 22.07.2020
2.3 Wiring, screening, earthing
When selecting wiring materials and installing and connecting the temperature con-
troller to the electricity supply, account must be taken of DIN VDE 0100 “Erection of
power installations with rated voltages below 1000” or the relevant national regulati-
ons (e.g. based on IEC 60364).
Wherever possible, keep input, output and supply leads and sensor cable
physically separate from each other and do not lay them parallel to each
other.
Use screened and twisted interface and sensor cables.
Earth the screening of temperature sensors unilaterally in the switchbox.
Ensure correctly wired potential equalisation.
2.4 Electrical safety
All control and load circuits must be fused in accordance with local regulati-
ons.
In order to prevent destruction of the relay or semiconductor relay outputs in
the event of a short-circuit, the load circuit should be fused to the maximum
permissible output current.
As well as incorrect installation, wrong parameter settings can also adversely
affect the correct functioning of the controller. For this reason, safety devices
that are independent of the controller should always be used, e.g. high and
low pressure valves or temperature limiters. Account should be taken of the
local safety regulations in this connection.
