Trouble-Shooting - Labkotec SET-2000 Installation And Operating Instructions Manual

SET-2000 (110 VAC)
Installation and Operating Instructions
4

TROUBLE-SHOOTING

Problem:
Possible reason:
Problem:
Possible reason:
Figure 7. 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 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 110 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-2000
control unit. See sensor specific instructions.
2. Measure the voltage separately between the poles 10 and 11 as well as 13 and
14. The voltages should be between 10,3....11,8 V.
3. If the voltages are correct, measure the sensor current one channel at a time.
Do as follows:
3.1 Disconnect sensor's [+] wire from sensor connector (poles 11 and 13).
3.2 Measure short circuit current between [+] and [-] poles.
3.3 Connect mA-meter as in figure 7.
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/wires back to respective connector(s).
If the problems 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 !
Channel 1
Poles
10 [+] and 11 [-]
20 mA – 24 mA
Short circuit
Sensor in the air < 7 mA
Sensor in the liquid > 8 mA
(r  2)
Sensor in the water > 10 mA
Table 1. Sensor currents
10/15 We reserve the right for changes without notice
D15349AE-1
Channel 2
Poles
13 [+] and 14 [-]
20 mA – 24 mA
< 7 mA
> 8 mA
> 10 mA