SQFlex Service Instructions

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4.3.1 Trouble-shooting of a solar-powered system with generator back-up
All measuring points/terminal designations in the following refer to the IO 101 switch box
1. Disconnect the pump
• Make sure that the generator has been turned off.
• Set the IO 101 switch to Off.
• Disconnect the pump cable from the terminals (X1.3, X1.4).
2. Check the solar modules
• Measure the DC voltage and short-circuit DC current across the terminals (2T1, 4T2).
See electrical connection in Section 1.4.
If the DC voltage or DC current is outside the range, one of the solar modules is faulty. Replace the
solar module.
3. Check the IO 101 box
• Set the IO 101 switch to on.
• Measure the DC voltage and DC current across the terminals (X1.3, X1.4).
If the values differ from the values measured under step 2, the IO 101 is defective. Replace the
IO 101.
4. Check the generator
• Set the IO 101 switch to off.
• Turn on the generator.
• Measure the AC voltage across the terminals (L, N).
The voltage (U) = rated generator voltage (see generator nameplate).
If the value is not correct, the generator is faulty. Repair or replace the generator.
5. Check the IO 101 box during generator operation
• The generator must be running. Set the IO 101 switch to on.
• Measure the AC voltage across the terminals (X1.3, X1.4).
The voltage (U) = rated generator voltage (see generator nameplate).
If the value is not correct, the IO 101 is faulty. Replace the IO 101.
6. Check the pump
• Set the IO 101 switch to off.
• Reconnect the pump cable to the terminals (X1.3, X1.4).
• Set the IO 101 switch to on.
Note that the dry running sensor is covered with water.
If the pump starts, it was stopped due to dry running and has now been reset.
• Wait five minutes.
If the pump does not start, it is defective. Repair or replace the pump.
sqflex_SI_US_WG.book Page 32 Thursday, October 1, 2009 3:27 PM