Device communication
70
isoxx1685Dx-x25_D00272_07_M_XXEN/09.2022
9.1.7 Alarm and operating messages via the BMS bus
Messages are transmitted to a maximum of 12 BMS channels. All alarm and operating messa-
ges that may occur are described below.
9.1.7.1 Alarm messages
9.1.7.2 Operating messages
Alarm Channel Description
Alarm 1 (insulation fault) 1
Insulation resistance "Prewarning"
(Value < response value 1, R
F
< R
an1
)
Alarm 2 (insulation fault) 2
Insulation resistance "Alarm"
(Value < response value 2, R
F
< R
an2
)
System connection 4 Connection fault system
Connection PE 5 Connection fault earth
Device error 7 Internal device error
Start insulation fault location
(isoxx1685DP only)
9 The insulation fault location is started
Overtemperature coupling 10 Overtemperature coupling terminal L1/+
Overtemperature coupling 11 Overtemperature coupling terminal L2/–
Overtemperature PGH
(isoxx1685DP only)
12 Overtemperature of the locating current injector
Alarm Channel Description
Insulation resistance 1
Current insulation resistance R
F
(when R
F
> (R
an1
+ hysteresis))
Insulation resistance 2
Current insulation resistance R
F
(when R
F
> (R
an2
+ hysteresis))
Leakage capacitance 4
Leakage capacitance C
e
in nF, µF
Mains voltage 5
Current system voltage U
N
Partial voltage U+/PE 6 Current partial voltage terminal L1/+ to earth
Partial voltage U-/PE 7 Current partial voltage terminal L2/– to earth
PGH current
(isoxx1685DP only)
8
Current PGH locating current (when EDS system is
active)
Temperature coupling 10 Current temperature of the coupling L1/+
Temperature coupling 11 Current temperature of the coupling L2/–
Temperature PGH
(isoxx1685DP only)
12 Current temperature of the locating current injector
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