This article describes instructions for measuring the insulation resistance of the Editron EC-LTS1200-410 and -400 model external inductor units.
| Insulation resistance testers generate lethal voltages. Only qualified personnel should perform insulation resistance measurements. | |
|
Before performing the insulation resistance measurement, disconnect all cables and connectors from the device under test. |
The insulation resistance is measured between the high voltage terminals and the frame. When measuring the inductors, the auxiliary circuits (i.e. PT100 measurements) are grounded. When measuring the auxiliary circuits, all high voltage parts are grounded.
Main high voltage circuit:
|
Test voltage |
Test duration |
Pass criteria |
|
500 VDC |
60 s |
>10 MΩ |
Perform the measurement using the following procedure:
1) Connect all pins of the temperature sensor connections to the device enclosure.
2) Connect the measurement device's ground cable to the device enclosure.
3) Connect the measurement probe to the high voltage connections.
4) Measure the insulation resistance and mark down the result
Auxiliary circuits
|
Test voltage |
Test duration |
Pass criteria for all models |
|
50 VDC |
60 s |
>10 MΩ |
Perform the measurement using the following procedure:
1) Connect the main circuits to the device enclosure.
2) Connect all pins of the temperature sensor connections together, except the enclosure ground (pin 7 in the LTS1200-410).
3) Connect the measurement device's ground cable to the device enclosure.
4) Connect the measurement probe to the temperature sensor connections.
5) Measure the insulation resistance and mark down the result
If the device does not conform to the pass criteria indicated above, contact Danfoss Editron service for more information.