7
Installation
Terminal connection
cover
Cover screw
Controller and VFS sensor have to have the same ground potential. The VFS sensor has a functional earth con-
nector (PELV). The PE-connector of the controller has to be connected to the pipe system near the sensor.
Caution
C.2. - Electrical connection
Danger
Before working on the unit, switch off the power supply and secure it against being switched on again! Check
for the absence of power!
Electrical connections may only be made by a specialist and in compliance with the applicable regulations.
Do not use the controller if the housing shows visible damage.
Caution
Low-voltage cables such as temperature sensor cables must be routed separately from mains voltage cables.
Feed temperature sensor cables only into the left-hand side of the unit, and mains voltage cables only into the
right-hand side.
Caution
The customer must provide an all-pole disconnecting device, e.g. a heating emergency switch.
Caution
The cables being connected to the unit must not be stripped by more than 55mm, and the cable jacket must
reach into the housing just to the other side of the strain relief.
Relays R1 and R2 are only suitable for standard pumps (20-120VA). These pumps are speed controlled by the
controller. Due to the internal wiring, even when switched off residual energy is present in R1 and R2.
Do not use R1 and R2 for valves, contactors or other devices with low power consumption.
Achtung
