4. Electrical connection
104781 - MRF-2 | MRH-2 - V2.4 - 22.07.2020
Page 17
4. Electrical connection
4.1 Safety during installation
Before connecting ensure that the mains voltage is the same as
indicated on the device's type plate.
Incorrect electrical connection can cause damage to the regulator and
to the equipment.
The temperature controller should be disconnected from the mains vol-
tage while connecting plant components or the sensor.
No appliances with current levels in excess of the maximum values in-
dicated at the technical data should be connected to the relay contacts
Use contactors.
Downstream contactors must be fitted with an RC protection circuit.
(see also section Fehler! Verweisquelle konnte nicht gefunden werden.)
No other consumers may be connected to the controller's mains termi-
nals.
4.2 Procedure
In order to avoid injury to persons or damage to connected
components, connections must in all cases be undertaken in the
following order!
This is to prevent an unsuitable pre-configuration damaging components when the
mains voltage is connected - e.g. compressor output is pulsed.
Pull out all the controller's plug-in terminals.
Put the controller in position in the housing or switchboard. (Section 3.3)
Connect all components and sensors in accordance with Section 4.4 (Circuit
diagram) to the plug-in terminals. (Do not yet plug the terminals into the con-
troller!)
Connect the mains cable to plug-in terminal A1 / A2.
Plug terminal A1/ A2 into the controller.
Close the switchbox and turn on the mains voltage.
Switch on the temperature controller and set the parameters (possibly using
the optional WELBA-KONSOFT configuration software).
Disconnect the system from the mains and open the switchbox.
Plug the pre-cabled plug-in terminals of the components into the controller.
Close the switchbox.
WARNING
WARNING
