Contact Protection Measures - WIKA GDM-RC-100-T Betriebsanleitung

5. Commissioning, operation
5.2.5 Closing the cable socket
Ensure that no moisture can enter at the cable end.
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For this, make sure that the cable gland of the fitted case cover fits the diameter of
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the cable used and that the cable gland is correctly seated.
EN
Make sure that the seals are present and undamaged.
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Tighten the cable gland with the torque specified in the specifications (→ see chapter
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9 "Specifications") and check that the seal is correctly seated, in order to ensure the
ingress protection.
5.2.6 Limit values for the contact load with resistive load
Do not exceed the limit values.
The switching current must not be less than 10 mA with low voltages (12 V) for switching
reliability reasons.
Overcurrent protectors
The instruments do not provide for incorporated overcurrent protectors. Therefore,
overcurrent protectors with the following nominal values must be used on the system side:
Max. 5 A (at T
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Max. 1 A (at T
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5.2.7 Contact protection measures

Mechanical contacts must not exceed the specified electrical values for switching
current, switching voltage and switching power independent of each other, not even for
a short time only.
For capacitive or inductive loads one of the following protective circuits is recommended:
Inductive load with DC voltage
With DC voltage the contact protection can be achieved via a free-wheeling diode,
connected in parallel to the load. The polarity of the diode must be arranged so that it
closes when the operating voltage is on.
Example:
Contact protection
measure with free-wheel-
ing diode
20
: -40 ... +70 °C [-40 ... +158 °F])
a
: > 70 ... 80 °C [-40 ... +176 °F])
a
If overcurrent protectors in accordance with EN 60127-2 or equivalent
are used, these must be selected with a high breaking capacity (e.g.
H1500A).
Contact
Diode Load
WIKA operating instructions, model GDM-RC-100-T