21
Attention
n
The following relocations of cables with basic insulation are not permissible:
Mains and control cables in low voltage areas.
n
To prevent the welding together of contacts provide an external slow-blow fuse T 2.5
A for the output contacts..
n
When switching off inductive loads, voltage spikes are produced that may impair
the operation of control and measuring systems. Connected inductive loads must be
provided with suppressors such as RC combinations as specified by the manufacturer.
n
Provide the level switch with an external slow-blow fuse: 63 mA at
230 V, 125 mA at 115V or 1A at 24 V.
n
For disconnecting the level switch install an easily accessible disconnector in the
close proximity of the equipment (EN 61010-1).
n
Mark the disconnector as isolating device for the conductivity switch.
Electrical connection
Commissioning procedure
1. Apply mains voltage. The green LED
5
for Power ON lights up.
The LEDs
1
,
2
3
,
4
Fig. 4
are lit as a function of the water level.
1. To check the switchpoints and their correct functioning fill or empty the tank accordingly. See table
Checking switchpoints and functions on
pages 22 and 23.
1. Make sure that the level switch is wired as specified in the wiring diagram.
Fig. 9
2. Make sure that the supply voltage agrees with the specification on the name plate.
Checking electrical connection
Applying supply voltage
Checking switchpoints and functions
To commission the equipment switch water level control system to manual operation.
Make sure that installation is in manual operation mode when you fill or discharge the
steam boiler or vessel.
Danger
- continued -
