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– Firmly re-insert the I/O board. Carefully connect the ribbon cable. Be careful that no connector pins are
bent! Don't apply force!
– At the terminals of the device, again check continuity for each pair of terminals that receives current from
the CTs.
– Attach the front panel and tighten the screws.
• Connect an ammeter in the supply circuit of the power supply. A range of about 2.5 A to 5 A for the meter is
appropriate.
• Switch on m.c.b. for auxiliary voltage (supply protection), check the voltage level and, if applicable, the po-
larity of the voltage at the device terminals or at the connection modules.
• The measured steady-state current should correspond to the quiescent power consumption of the device.
Transient movement of the ammeter merely indicates the charging current of capacitors.
• Remove the voltage from the power supply by opening the protective switches.
• Close the protective switches for the voltage transformers.
• Verify that the voltage phase rotation at the device terminals is correct.
• Open the miniature circuit breakers for the transformer voltage (VT mcb) and the power supply.
• Check tripping circuits to the circuit breakers.
• Check the close circuits to the power system circuit breakers.
• Verify that the control wiring to and from other devices is correct.
• Check the signalling connections.
• Close the protective switches.
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009
Mounting and Commissioning
3.2 Checking Connections
211
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