MI 3143 Euro Z 440 V
Safety and operational considerations
9
Typical charging profile which is also used in this instrument is shown in
Figure 2.2
.
I
CH/8
Fastcharge Safety Time
Precharge
Time
Current Regulation
Voltage Regulation
I
CH
V
REG
V
LOWV
Charg
e
Curre
nt
Charg
e
Volta
ge
Figure 2.2: Typical charging profile
where:
V
REG
................................... Battery charging voltage
V
LOWV
................................. Precharge threshold voltage
I
CH
...................................... Battery charging current
I
CH/8
.................................... 1/8 of the charging current
2.2.3 Precharge
On power up, if the battery voltage is below the V
LOWV
threshold, the charger applies 1/8 of
the charging current to the battery. The precharge feature is intended to revive deeply
discharged battery. If the V
LOWV
threshold is not reached within 30 minutes of initiating
precharge, the charger turns off and a FAULT is indicated.
Note:
As a safety backup, the charger also provides an internal 5-hour charge timer for fast
charge.
Typical charging time is 3 hours in the temperature range of 5
°C to 60°C.
I
ch/8
I
ch
T
LT
F
T
C
O
O
L
T
W
A
R
M
T
H
T
F
Charge
Suspended
Charge
Suspended
Temperature
C
ur
re
nt
Charge
Figure 2.3: Typical charging current vs temperature profile
where:
