Troubleshooting in VSB Soft
Contents
1. VSB Sawewa AG CH 8633 Wolfhausen Switzerland Troubleshooting in VSB Soft Starters All VSB Soft Starters undergo visual mechanical and electrical tests before leaving the factory We keep test records of every device In addition all VSB Soft Starters are started up and tested under load with a motor before leaving the factory However if faults still occur we treat this very seriously and would kindly ask you to report this to us even if you can repair the fault yourself If the VSB Soft Starter does not work you could possibly try the following tests Please act with care because there are potentially dangerous voltages in the device The following test may only be performed by qualified technicians The user is responsible for any injuries and damage resulting from unauthorized actions 1 Visual inspection Compare the delivery document with the rating plate on the device delivered Do the details match 2 Cooling Is the VSB Soft Starter positioned in such a way as to allow natural ventilation The cooling fins should be positioned vertically and the cooler should not be blocked either on the top or the bottom 3 Connections Isolate the current and check that all the connections on the device are secure They may have come loose during transport or in operation Are the phase conductors in the VSB Soft Starter connected in the correct phase The VSB device monitors the rotary field and inhibits operation if t2. ax 41 55 263 15 79 E mail info vsb sawewa ch 2 Tel 41 55 263 15 75 Fax 41 55 263 15 79 E Mail info vsb sawewa ch Dok e 01 10 00 tp page
3. he phase conductors are not connected in the sequence A B C Are the motor leads connected correctly Is there a start signal between pins 2 and 3 4 Electrical test Switch on the current and check that the mains voltage to connection terminals L1 L2 and L3 is correct 10 Perform the same check on the VSB Soft Starter s output terminals to the motor The supply voltage for the VSB electronics unit is connected by us at the factory If this connection is correct LED 1 green is illuminated permanently Measure the outputs at X1 X2 and X3 on the VSB s main electronics unit The connections for the thyristors bu gt 300mMA are contained here Check that the thyristor semiconductor is working in accordance with the description of the Thyristor Check If power is supplied via a mains transformer the nominal power rating of the transformer should be between gt 1 5 times and lt 10 times the nominal power rating of the VSB Soft Starter Relay and contactor coils which are contained in the same circuit must be fitted with overvoltage limiters if necessary Tel 41 55 263 15 75 Fax 41 55 263 15 79 E Mail info vsb sawewa ch Dok e 01 10 00 tp page VSB Sawewa AG CH 8633 Wolfhausen Switzerland 5 Technical support If you require any further support don t delay in contacting us directly at VSB SAWEWA AG Oberwolfhauserstr 8 CH 8633 Wolfhausen Tel 41 55 263 15 75 F
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