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3. Function
3.1 Device features
• Monitoring of the insulation resistance R
• Monitoring of the nominal battery voltage U
• Measurement of the residual voltages U
earth
• Determination of the faulty conductor L+/L-, i.e. the distribution of the insulation
resistance R
between terminals "L+" and "L-"
F
• Monitoring and automatic adjustment to the system leakage capacitance C
4 μF
• Continuous connection monitoring of terminals "L+", "L-" and "E"
• Selectable start-up delay, response delay and delay on release
• Two separately adjustable response value ranges of 10 kΩ ...5 MΩ (alarm 1, alarm 2)
• Configurable measuring frequency for adjustment to the physical characteristics of
the battery
• Alarm signalling via LEDs ("AL1", "AL2"), display and alarm relays ("K1", "K2")
• Automatic device self test
• N/C operation or N/O operation selectable
• Measured value indication via multi-functional LCD
• Fault memory can be activated
• Device supply via wide-range power supply
• RS-485 (galvanically isolated) including the following protocols:
BMS interface (Bender measuring device interface) for data exchange with other
•
Bender components (bidirectional)
Modbus RTU (bidirectional)
•
IsoData for continuous data output (unidirectional)
•
• Password protection to prevent unauthorised parameter changes
8
to earth
F
between terminals "L+" and "L-"
n
and U
of terminals "L+" and "L-" to
L+e
L-e
e
Function
3.2 Functional description
The isoBAT425 ISOMETER® is intended for monitoring the insulation resistance R
as the voltage of a battery during its assembly from individual battery cells. The ISOME-
TER® measures the insulation resistance R
battery to earth. In addition, the nominal voltages U
voltages U
(between U
L+e
red.
The first step consists of assembling the battery in two parallel strings (plus and minus
up to
string) which are not interconnected. During the second step, the two strings are con-
nected to form a complete battery by means of another battery.
The resulting measured values allow diagnosing the type and location of the insulation
fault. In the LC display, the faulty conductor is displayed with a plus or a minus sign
preceding the value R
.
F
It is possible to assign the detected fault or the faulty conductor to an alarm relay via the
menu. If the values R
or U
F
and the alarm relays "K1" and "K2" issue an alarm according to the alarm assignment set-
tings in the "out" menu. In addition, the operating mode of the alarm relay (n.c./n.o.) can
be set and the fault memory "M" can be activated in this menu.
If the values R
or U
do not violate their respective release value (response value plus
F
n
hysteresis) for the period t
their initial position and the alarm LEDs "AL1"/"AL2" will go out. If the fault memory is ac-
tivated, the alarm relays remain in alarm condition and the LEDs light until the reset but-
ton "R" is pressed or the supply voltage U
The device function can be tested using the test button "T". Parameters are assigned to
the device via the LCD and the control buttons on the front panel; this function can be
password-protected. The parameters of the device can be set via Modbus RTU.
3.2.1 ZE420 coupling impedance
In the case of open battery strings, the ZE420 coupling impedance provides a low-re-
sistance connection (10 kΩ) between terminals "L+" and "L-", necessary for the measuring
functions of the ISOMETER®. In the case of closed batteries, the resistance is optional due
to the internal resistance of the battery.
In addition to this resistance, there is also an optional 1.5 mA current limitation. It starts
above U
= 25 V and increases the internal resistance of the coupling impedance. For this
n
reason, in the event of a cross fault, the system connection monitoring may be additio-
nally triggered but, at the same time, the responsivity of the cross fault detection is
increased.
and the system leakage capacitance C
F
between L+ and L-, the residual
n
and earth) as well as U
(between U
L+
L-e
violate the activated response values in
n
without interruption, the alarm relays will switch back to
off
is interrupted.
s
isoBAT425_D00308_04_M_XXEN/07.2020
as well
F
of the
e
and earth) are measu-
L-
"AL"
menu, the LEDs
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