Siemens NXPLUS C Installation And Operating Instructions Manual page 182

Installation
Electrical function test
Faults during test
operation
Fault clearing
Completing test operation
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Before commissioning, verify correct operation of the switchgear by test operation. Perform
test operation without high voltage.
For test operation, switch the three-position disconnector to the basic position.
➭ Switch the three-position disconnector for the DISCONNECTING and EARTHING functions
to OPEN position by hand.
➭ Switch on all auxiliary voltages and control voltages and verify correct polarity.
✔ The motor of the circuit-breaker operating mechanism charges the closing spring.
➭ Test panels with electromagnetically interlocked three-position switch only with applied
auxiliary voltage.
➭ Check whether the mechanical and/or electrical interlocking conditions are fulfilled without
using excessive force.
➭ Check the position indicators of the three-position disconnector.
➭ Switch the three-position switch and the circuit-breaker several times to CLOSED and OPEN
position, both directly at the panel and from remote.
- Check whether the positions are correctly indicated on the panel and in the control room,
if applicable.
- Check whether the auxiliary switches and the position switches operate correctly.
➭ After operating the three-position switch, check whether the operating levers can be
pushed onto the operating shafts.
If not, the motor may have jumped over due to reverse polarity. Inform the regional
Siemens representative.
➭ Check the function of the closing solenoid by electrical operation.
➭ Check the function of the shunt releases, c.t.-operated releases and undervoltage releases
by electrical operation.
• The three-position disconnector does not move to the desired position during the first
electrical operation. (Example: The three-position disconnector moves to the "EARTHING
SWITCH CLOSED" position instead of the "DISCONNECTOR CLOSED" position).
• The control system of the three-position disconnector has detected the incorrect execution
of the command and is in fault mode. In this condition, no further electrical switching
operations are possible.
High voltage and explosion hazard
Putting defective switchgear into operation can cause serious injury and property
damage.
➭ If there are any faults that cannot be cleared on site: Do not put the switchgear into
operation.
➭ Inform the regional Siemens representative.
➭ Check the polarity of the auxiliary voltage and the motor connection.
➭ Switch the operating mechanism manually back to the basic position. The position
indicator for the DISCONNECTING and EARTHING functions shows OPEN (see page 192,
"Operating the three-position switch").
➭ Reset the fault mode: The fault mode can be reset in 2 different ways:
- Switch the auxiliary voltage off and on again.
- Operate the reset button (through the opening at the front of the device).
➭ The fault mode is reset by switching the auxiliary voltage off and on, or by operating the
covered reset button through the opening at the front of the device.
✔ The three-position disconnector can be put into operation again.
➭ Perform test operation of the three-position disconnector.
➭ Switch all switching devices to OPEN position.
Revision 11 • INSTALLATION AND OPERATING INSTRUCTIONS • NXPLUS C • 802-9081.9
INFORMATION
CAUTION