Trouble-Shooting - Labkotec SET-1000 Installation And Operating Instructions Manual

SET-1000
Installation and Operating Instructions
4

TROUBLE-SHOOTING

Problem:
Possible reason:
Problem:
Possible reason:
Figure 10. Sensor current measurement
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MAINS LED indicator is off
Supply voltage is too low or the fuse is blown. Transformer or MAINS LED
indicator is faulty.
To do: 1. Check if the two pole mains switch is off.
2. Check the fuse.
3. Measure the voltage between poles N and L1. It should be 230 VAC +
10 %.
FAULT LED indicator is on
Current in sensor circuit too low (cable break) or too high (cable in short
circuit). The sensor might also be broken.
To do: 1. Make sure, that the sensor cable has been connected correctly to the
SET-1000 control unit. See sensor specific instructions.
2. Measure the voltage separately between the poles 10 and 11. The
voltages should be between 10,3....11,8 V.
3. If the voltages are correct, measure the sensor current. Do as follows:
3.1 Disconnect sensor's [+] wire from sensor connector (pole 10).
3.2 Measure short circuit current between [+] and [-] poles.
3.3 Connect mA-meter as in figure 10.
Make a comparison to the values in Table 1. More detailed current
values are to be found in the instructions of specific sensor's
instructions. E.g. SET/DM3AL sensor's current is 3 - 4 mA when
the sensor is fully immersed in water and it is 9 - 11 mA when
sensor is in the air.
3.4 Connect the wire back to the connector.
If the problem can not be solved with the above instructions, please
contact Labkotec Oy's local distributor or Labkotec Oy's service.
Attention ! If the sensor is located in an explosive atmosphere, the
multimeter must be Exi-approved !
Short circuit
Sensor in the air
Sensor in the liquid
(r  2)
Sensor in the water
Table 1. Sensor currents
10/14 We reserve the right for changes without notice
D15233FE-2
Channel 1
Poles 10 [+] and 11 [-]
20 mA – 24 mA
< 7 mA
> 8 mA
> 10 mA