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iso685-D-P_D00170_00_M_XXDE/06.2016
44
Settings
10. Settings
10.1 Settings in the device menu
The settings of the ISOMETER® are explained in the order of the device menu.
10.1
1.0 Alarm settings
The limit values for the insulation resistances of alarm 1 and alarm 2 can be specified in
the alarm settings menu and can be adapted to the user profile of the ISOMETER®. A de-
vice password is required for entering the settings. You can adjust the following func-
tions:
10.1
1.1
Insulation alarm
In the Insulation alarm menu, the ISOMETER® limit values for alarm 1 and alarm 2 can be
set.
Activation or deactivation of the two alarm levels
R
an1
(alarm 1) and
R
an2
(alarm 2) are il-
lustrated in the following graphic:
An alarm will become inactive as soon as the hysteresis of the set operating value is ex-
ceeded.
10.1
1.1.1
Alarm 1
For alarm 1 an insulation resistance of 1 kΩ…10 MΩ can be set irrespective of alarm 2.
10.1
1.1.2
Alarm 2
For alarm 2 an insulation resistance of 1 kΩ…10 MΩ can be set irrespective of alarm 1.
t
R
R
an1
R
an2
Alarm 1
active
Alarm 2
active
Alarm 2
inactive
Alarm 1
inactive
hysteresis
hysteresis
10.1
1.1.3
Fault memory
Automatic reset of inactive faults at the outputs relay 1, relay 2, digital output 1, digital
output 2:
10.1
1.2
DC alarm
The DC alarm is triggered in the event of a DC offset voltage (
U
DC-E
) in the system.
10.1
1.2.1
Alarm
10.1
1.2.2
U(DC-E)
Set the DC alarm to a value between 20 V and 1 kV.
•on
If a fault becomes inactive, the programmed outputs remain
in fault condition until they are reset manually.
•off
If a fault becomes inactive, the programmed outputs auto-
matically change the state.
•on
The DC alarm is triggered in the event of a DC offset voltage.
•off
The DC alarm is NOT triggered in the event of a DC offset
voltage.
120 V
t
V
DC+
DC-
100 V
200 V
0 V
-80 V
-100 V
R
f
R
f
U1
U1
U2
U
2
U
DC-E
=(
U
1
+
U
2
)/2=(120 V-80 V)/2=20 V
U
DC-E