Solenoid valve controller HE 5721
General Safety Instructions
1.3. Electrical Connections
Danger due to electrocution!
All electrical wiring must be conform to local Electrical Standards (e.g. VDE 0100 in
Germany). The input leads must be kept separate from signal and mains leads.
The protective earth must be connected to the relevant terminal (in the instrument
carrier).
In order to prevent electrical interferences, we recommend using twisted and
screened cables. The electrical connections must be made according to the
relevant connecting diagrams.
Commissioning
Before instrument switch-on, ensure that the advices and specifications given below are
followed:
Ensure that the supply voltage corresponds to the specification on the instrument label. All
covers required for contact safety must be applied.
Before instrument switch-on, check if other equipment and / or facilities connected in the same
signal loop is / are not affected. If necessary, appropriate measures must be taken.
For instruments with protection class I, the protective earth must be connected with the relevant
terminal in the instrument carrier.
The instrument may be operated only when mounted in its enclosure.
Operation
Switch on the supply voltage. The instrument is now ready for operation.
If necessary, a warm-up time of approx. 15 min. should be taken into account.
Warning!
Any interruption of the protective earth in the instrument
carrier can impair the instrument safety. Intentionally
interruptions are not permitted.
If the instrument is damaged to an extent that safe operation
seems impossible, shut it down and protect it against
accidental operation.
Trouble shooting
Before checking the instrument, all possibilities of error in other equipment and connections
(input leads, wiring, equipment connected in the output circuit) should be checked. If the trouble
cannot be located by checking these points, we recommend returning the instrument to the
manufacturer.
Note!
Note that primary elements (especially thermocouples) connected to the energized
transmitter are grounded in many cases, i.e. that the insulation resistance during
operation can be reduced considerably. In these cases, additional connection to
earth is not permissible
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