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7.2 Protective circuits and safety features
Description
Insulation test voltage
Insulation test voltage
Leakage current to ground
Excess mains voltage
and transient protection
Mains fuse
Excess output voltage
Undervoltage at output
Output fuse
Reversed polarity at output
Overheating (charger)
Overheating (battery)
Limitation of charging time /
charging energy
NLG4
Condition
Mains input to battery output
Ground/interface to battery:
ground/interface to mains:
Un=230V, 50Hz
All operating conditions
Built in
Supply to battery is cut at
maximum charging output
Battery almost fully discharged or
not connected
Built in
No destructive effect
All operating conditions
(see 1.5, de-rating)
In any phase of the charging cycle
In each individual phase of the
charging cycle as well as the total
per charge
Value / range
3750V
2000V
2000V
< 3.5mA
VDE 0160
IEC 801-2/3/4
16A, quick-acting,
double-pole
Software-configurable
protection: max. 10% over-
shoot
Physical protection (fixed):
max. 5% overshoot.
Charging begins only at or
above an adjustable thresh-
old voltage value
1.5 times the nom. current,
solid-state, single-pole
contactor
Protection provided by
built-in or external fuse
Linear reduction of output
when risk of semiconduc-
tors and transformers over-
heating
Linear reduction of output
or shut-down programma-
ble with hysteresis
Programmable: charger
shuts down after exceeding
limits
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