electrical safety tester / high-voltage / operational / ground bond

The submersible pumps manufactured must be tested as automatically as possible. In addition to the safety tests, function test of the pump and leak test of the motor compartment, including the float switch, were performed.

Solution

Several recesses were provided in the support for the pump base so that several types of pumps can be tested without modification of the testing system. In the process it is ensured that the actual pump body is at the same height for all types of pumps, thus allowing automatic fixing and contacting. The Schuko plug is clamped in a clamping device, in which it is simultaneously sealed and electrically contacted. The entire test device is set up in a drawer, so that the pump can be easily placed and then, slid into the testing area secured with light curtains. Following placement of a pump, it is automatically scanned by the integrated scanner and the appropriate test program is selected on the list of products, so as to avoid selection of the wrong test program.

The tests were carried out in parallel to achieve a short testing duration despite the relatively long time for the leak test (approximately 25 seconds). Once the leak test is started, the ground bond test, the high voltage test, the insulation test and the functional test, including the float switch test are executed in parallel. Following this, the result of the leak test is checked after waiting for a short while. At the end of the test, the screw for sealing the motor compartment is screwed in by the testing personnel and subsequently checked by a sensor, whether it is actually present. Finally, the pumps will be automatically marked as tested with a hot stamping punch.