Protect PV.630 Operating Instructions
Maintenance mode:
Maintenance mode can be triggered either via a command or by means of remote signalling. Active earthing switches off immedi- ately when maintenance mode is activated. However, the digital signals from the isometer continue to be ignored. Active earthing is switched on again the next time a switch is made to “Operation” status. However, the unit remains in maintenance mode for at least a certain time; i.e. even if the unit is switched over to the “Opera- tion” status, maintenance mode is not terminated until this time has elapsed.
Starting the insulation test manually:
The insulation test can be started manually for maintenance work.
Active earthing is switched off when the insulation test is started and the test actually commences once a delay has elapsed. When the test time has elapsed, the insulation test ends and active earth- ing is switched on again.
The insulation test can only be started manually if an insulation test is not already running at the time.
5.3.4Insulation Monitoring in Partner Operation
In partner operation (see Chapter 5.5), both inverters are fitted with the isometer.
Insulation measurement in single operation
In single operation, the two inverters behave like two individual units. Insulation measurement is active in both inverters.
Insulation measurement in linked operation
In linked operation, the inverters are connected on the DC voltage side. If both inverter isometers were to be active in this operating mode, this would distort the measurement of the insulation re- sistance. Therefore, in linked operation, the isometer of the invert- er which is not active is switched off and its sensors are discon- nected from the DC voltage. Now only one isometer is active and the measurement of the insulation resistance is correct.
5.3.5Insulation Monitoring Parameters
All parameters are only relevant for operation with
Insulation test time:
The analogue and digital signals from the isometer are evaluated during this time.
Delay for insulation test following shutdown of K21 (earthing of PV cells):
Once the earthing has been disconnected, this time must elapse before insulation measurement can start.
Delay for shutdown of K21 in night operation:
Once sequence control has switched to the “Night” status, this time must elapse before earthing is removed with contactor K21.
Minimum time in maintenance mode:
If maintenance mode has been activated, the earthing is discon- nected and remains so for at least this time.
8000047961 BAL | 35 of 72 |
