isoPV1685xxx_D00007_05_M_XXEN/02.2020
19
Settings
7. Settings
7.1 Setting BMS address
Refer to
"Setting the BMS address" on page 23
.
7.2 Setting an alarm for insulation faults
You can set the limit values for alarm 1 and alarm 2 of the ISOMETER® via the BMS bus by
means of a BMS gateway (e.g. COM460IP) or a terminal program. Activation or deactiva-
tion of the two alarm levels
R
an1
for alarm 1 and
R
an2
for alarm 2 are illustrated in the fol-
lowing graphic:
An alarm will become inactive as soon as the hysteresis of the set operating value is ex-
ceeded.
One insulation resistance from 200 Ω…1 MΩ can be set respectively for alarm 1 and alarm
2. Condition: alarm 1 ≥ alarm 2.
t
R
R
an1
R
an2
Alarm 1
aktiv
Alarm 2
aktiv
Hysterese
Alarm 1
inaktiv
Hysterese
Alarm 2
inaktiv
7.3 Setting the system leakage capacitance or measurement
speed
The switch 6 of the DIP switch SS8103 is used to set the profile considering the maximum
system leakage capacitance
C
e max
.
The measurement speed can be changed using switch 7.
The switches 6 and 7 of the DIP switch SS8103 are used to switch the maximum system
leakage capacitance
C
e max
and the measurement speed. The measurement speed can be
set to "Slow" in case of frequently occurring fault alarms caused by transients in the sys-
tem. In the slow mode, the measurement time doubles. Segment 8 is reserved.
These settings may only be changed when the PV voltage is switched off.
When the maximum system leakage capacitance C
e max
is set
to 2000μF
the upper limit of measuring range for the insulation resistance decreases
from 1MΩ to 50kΩ. Therefore, check also the settings of the response val-
ue R
an
.
DIP switch SS8103, segment 6:
OFF = 500 μF =
C
e max
ON = 2000 μF =
C
e max
Switch position:
Up = Off
Down = On
DIP switch SS8103, segment 7:
OFF = Fast
ON = Slow
S8103
1
2
3
4
5
6
7
8
A4
A3
A2
A1
A0