Siemens 8DJH

500-8067.9 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DJH • Revision 05 115/121
Annex
23.4 Fault signals
Output of 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 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.
• A command is applied to one of the active command inputs (disconnector CLOSED /
disconnector OPEN / earthing switch CLOSED / earthing switch OPEN) for more than
5 minutes, although the associated switching operation was completed successfully.
Fault mode, clearing Options for clearing the fault mode after the cause for the fault mode was eliminated:
• Through the reset button at the device (operation of the reset button: insert a thin, pointed
object through the opening at the front side.)
• By removing and re-applying the control voltage
NOTICE
Functional failure due to insufficient voltage quality
The functioning of MCU 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~
.
NOTICE
Functional failure due to incorrect circuit of the command inputs
The functioning of MCU 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.
NOTICE
Damage to MCU 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 may be damaged by too high test voltages.
➭ Before performing the dielectric test, remove the connecting plugs at the MCU.