MS220C
12150-0703-03
Seite
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9
Commissioning
Attention!
Before switching on make sure that the operational voltage Us of the
Type plate and the mains voltage are the same!
After the supply voltage is switched on and when the thermistors are correctly connected the relay contacts
11,14 close.
The correct function of the tripping device must be checked by resistance simulation at terminals T1 and T2.
This check is also performed after changes to the installation.
Line interruption test: disconnect sensor line at terminal T1 or T2
Temperature test: increase resistance
0 Ω < R < 1500 Ω up to 4000 Ω.
With commissioning and after modification of the plant the sensor resistance must be checked with a suitable
measuring instrument. With a resistance < 50 Ω the sensor circuit is to be examined for short-circuit.
Attention! Check PTC’s only with measuring voltages of < 2.5 V.
10
Trouble shooting
Relay does not pick up. Please check:
•
The supply voltage Us at terminals A1 - A2
•
The PTC sensors at terminals T1 - T2
•
The resistance of a PTC set must be within 0 Ω < R < 1500 Ω.
The terminal voltage T1 - T2 is to be
measured < 0,8 V
with connected PTC’s.
Relay does not release. Please check:
•
With no PTC sensor connected the TMP trip relay must release.
•
The voltage at terminals T1-T2 must be > 1 V.
In case of any other malfunction replace the device. Please add a description of the failure and send it back
for repair.
11
Maintenance and repair
The devices are maintenance-free. Only the manufacturer may accomplish repairs. We recommend testing
within the regular maintenance intervals of the plant, where the device is used.
