Status Output Ok Hs - Bender ISOMETER iso175 Manual

Function
Insulation resistance measured value no longer up to date
The ISOMETER® offers the possibility of monitoring automatically whether the insulation resistance measured
value is updated within a defined time period (parameter Isolation: Threshold_Timeout_Measurement). If the
measured value has not been updated within the defined time period, the corresponding alarm bit (Status:
Warnings_and_Alarms, bit 6) is set. As soon as the insulation resistance measured value has been updated, a
possibly active alarm is reset automatically (prerequisite: Self-holding Alarm: Activation = 0xFC).
ADVICE
For proper functioning of this feature, the maximum measuring time for an individual measurement
(dependent on the respective profile) must be selected for the Threshold_Timeout_Measurement ≤,
since after the maximum measuring time has expired an ongoing measurement is aborted and a new
measurement is automatically started (see chapter "Measurement profiles", page 16).
HV voltage unbalance faults
When the function (Unbalance: Threshold > 0) is activated, the ISOMETER® monitors the two partial voltages
HV+ and HV-, in each case against chassis ground. Prerequisite for this is that the HV voltage is ≥ 20 V (Voltage:
HV_System). As soon as the percentage share of the smaller voltage component falls below the programmed
threshold value, the corresponding alarm bit (Status: Warnings_and_Alarms, bit 7) is set. When the threshold
value + 5 % hysteresis is exceeded again, the set alarm bit is deleted automatically (prerequisite: Self-holding
Alarm: Activation = 0xFC).
Undervoltage error
When the function (Unbalance: Threshold_Undervoltage > 0) is activated, the ISOMETER® monitors the HV-
system voltage (Voltage: HV_System). If the HV-system voltage falls below the configured threshold value, the
corresponding alarm bit (Status: Warnings_and_Alarms, bit 8) is set. When the threshold value + 5 % hysteresis
is exceeded again, the set alarm bit is deleted automatically (prerequisite: Self-holding Alarm: Activation = 0xFC).
System condition unstable (fast start measurement)
An active alarm bit (Status: Warnings_and_Alarms, bit 9) signals an unstable HV-system condition with respect
to the insulation resistance (see chapter '"Fast start measurement", page 13').
Earth disconnector open
The device signals an alarm (Status: Warnings_and_Alarms, bit 10) as soon as the disconnector for the chassis-
ground connection is open, as no insulation measurement can be carried out with this condition. As soon
as the disconnector has been closed again, the corresponding alarm bit is deleted (prerequisite: Self-holding
Alarm: Activation = 0xFC ).
4.10.3 Status output OK
The status output is designed as an open collector topology and connects to terminal 15, when no alarm is
active (Status: Warnings_and_Alarms = 0). As soon as at least one alarm is active, the internal output transistor
locks so that the external pull-down resistor pulls the output to the terminal 31 potential.
20 iso175_D00415_01_M_XXEN/11.2023
HS