Technical Data; Fault Signals - Siemens NXPLUS C Installation And Operating Instructions Manual

Annex
Binary inputs
Binary input Description
1 Command inputs
2
3
4
5 Interlocking inputs
6
7 Feedback inputs
8
9
1
Depending on the panel type and the necessary sense of rotation of the motor, the assignment of the sense of rotation of the motor can
vary.
Output of fault signals
286/293
32.4

Technical data

Command input, feedback and interlocking is done through a total of 9 binary inputs (BI).
Type Electrical function
Active High active
Passive High active
Passive Low active
Passive High active
Functional failure due to insufficient voltage quality
The functioning of MCU-MH may be impaired.
➭ The voltage quality of the voltages used for auxiliary and load circuits must correspond to
applicable standards.
➭ If an AC control or AC load voltage is used, which is generated directly from single-phase
inverters, earth U
N2~
Functional failure due to incorrect circuit of the command inputs
The functioning of MCU-MH may be impaired.
➭ For activation of the command inputs for disconnector CLOSED, disconnector OPEN,
earthing switch OPEN and earthing switch CLOSED, do not use any external switching
contacts that are equipped with capacitors > 4.7 nF connected in parallel with the contact.
Damage to MCU-MH due to test voltages
If the specified limits (1 kV, 1 s) are exceeded during dielectric tests according to the
standard IEC 62271-200, the MCU-MH may be damaged by too high test voltages.
➭ Before performing the dielectric test, remove the connecting plugs at the MCU-MH.
32.5

Fault signals

Fault signals at the unit are displayed via a red flashing LED status indicator.
Possible causes for a fault signal:
• An incorrect sense of rotation of the motor was detected while moving the operating
mechanism from disconnector OPEN / earthing switch OPEN position to
disconnector CLOSED / earthing switch CLOSED position.
• There is an internal MCU-MH fault (watchdog).
• The feedback monitoring time (runtime monitoring of the operating mechanism) for
protecting the drive motor and the mechanical system was exceeded.
• A command for moving the operating mechanism is applied to the active command inputs
(disconnector CLOSED / disconnector OPEN / earthing switch CLOSED / earthing
switch OPEN) for more than 5 minutes, although existing interlocking conditions prevent
the execution of this command.
Revision 11 • INSTALLATION AND OPERATING INSTRUCTIONS • NXPLUS C • 802-9081.9
Function
Disconnector in CLOSED position
Disconnector in OPEN
Earthing switch in CLOSED
Earthing switch in OPEN
Total of all interlocking conditions, release of control
unit with applied high signal
Other interlock / 2-phase switching of the disconnector
and earthing switch function
Disconnector and earthing switch in OPEN
Disconnector in CLOSED
Earthing switch in CLOSED
NOTICE
.
NOTICE
NOTICE
1
1
position
1
position
1
position
1
position
1
position
1
position