Acknowledging Disturbance Messages; Acknowledging Disturbance Messages Via The Key Switch; Acknowledging Disturbance Messages Via The User Interface; Remedial Action In Case Of Disturbances - SMA MEDIUM VOLTAGE POWER STATION 500SC-JP System Manual

9 Troubleshooting
• Select the button [Download].
• Choose the save location.
• Select the button [Save].
9.3.3

Acknowledging Disturbance Messages

9.3.3.1

Acknowledging Disturbance Messages via the Key Switch

Dealing with disturbances
Disturbance messages should only be acknowledged once the underlying causes have been eliminated.
If the causes of the disturbance have not been eliminated, the disturbance will still be detected after
acknowledgment and the disturbance message will reappear.
Procedure:
1. If an insulation error has occurred, switch the insulation monitoring device back on.
2. Turn the key switch switch to Stop and then back to Start after two seconds.
9.3.3.2

Acknowledging Disturbance Messages via the User Interface

Dealing with disturbances
Disturbance messages should only be acknowledged once the underlying causes have been eliminated.
If the causes of the disturbance have not been eliminated, the disturbance will still be detected after
acknowledgment and the disturbance message will reappear.
You will only be able to acknowledge error messages via the user interface after entering the installer password.
Procedure:
1. If an insulation error has occurred, switch the insulation monitoring device back on.
2. Log into the user interface (see Section 12.8.1, page 177).
3. Select the parameter Ackn in the device displaying the error, and set to Ackn.
4. Select the button [Save].
9.3.4

Remedial Action in Case of Disturbances

9.3.4.1

Inverter Behavior in Case of Disturbances

If a disturbance occurs during operation, this may be caused by a warning or an error.
There are two levels assigned to each disturbance which influence the display and system behavior. Only in the case
of certain disturbances will the inverter behavior differ depending on the level. The level is increased from 1 to 2 if the
disturbance occurs five times within two hours or without interruption for two hours.
Inverter behavior in the disturbance levels 1 and 2:
• Waiting time
The inverter switches to the operating state "Disturbance" and opens the AC contactor and DC switchgear. The
inverter does not feed into the grid for the defined waiting time.
The waiting time specifies how long the disturbance will be shown on the touch display and saved as a
disturbance. Once the waiting time has elapsed, the disturbance is no longer shown on the touch display. The
inverter then checks whether the cause of the disturbance has been rectified.
If the cause of the disturbance still exists after the waiting time has expired or the disturbance has been
acknowledged, the inverter remains in the operating state "Disturbance".
120 MVPS22JP-SH-en-11
SMA Solar Technology AG
System Manual