Operation Manual

Protect PV.250 Operating Instructions
Page 14 of 51 80000027023 BAL, en
4.1.8 Sequence Control Parameters
Switch-on conditions: Underfrequency, overfrequency,
undervoltage, overvoltage:
The unit will only switch from the "Waiting for feed conditions"
status to the "Operation" status if the feed conditions are met.
These conditions include the mains voltage and the mains
frequency. These values must be within certain limits, which are
described with the switch-on conditions.
Voltage limit value for night detection,
delay time for night detection:
If the DC voltage falls below the voltage limit value for longer than
the delay time, the unit switches to the "Night" status.
Voltage limit value for day detection,
delay time for day detection:
If the DC voltage rises above the voltage limit value for longer than
the delay time, the unit switches to the "Waiting for feed condi-
tions" status.
Stack switch-on time:
The time for which the inverter stack is switched on during a start-
up attempt
Permissible voltage dip after switching on the stack:
Prior to the start-up attempt, a limit value is calculated from the in-
stantaneous DC voltage and the permissible voltage dip.
If the start-up attempt causes the DC voltage to fall below this cal-
culated limit value, this start-up attempt will fail.
Delay until the next start-up attempt following failure on ac-
count of excess voltage dip:
After the failure of a start-up attempt, this delay must elapse before
the next start-up attempt is made.
Power limit value for shutdown,
delay time for shutdown:
If the power fed into the mains is below the limit value for longer
than the delay time, the unit switches to the "Waiting" status.
Standard delay for a renewed start-up attempt following shut-
down,
offset delay added to the standard delay after shutdown,
maximum number of times the offset delay can be added to
the standard delay:
Variable delay in the "Waiting" status, see also Chapter 4.1.4.
Minimum DC voltage,
fill factor (PV system parameter):
If the DC voltage rises above a value resulting from the minimum
DC voltage divided by the fill factor, a start-up attempt is made.
4.2 Description of Fan Control
4.2.1 General
The Protect PV.250 features temperature-dependent fan control.
The fans are either switched off or run on a fast or slow fan stage.
Fan control extends the operating time of the fans, minimises the
noise generated by the fans and improves the efficiency of the unit
by reducing its power consumption.