ISOSCAN® EDS440 and EDS441
9.1.2 Trigger function
The locating current pulse of the ISOMETER® is synchronised with the measurement technology in the EDS.
The EDS is informed when to expect a locating current pulse. This allows a more reliable detection of the
locating current pulse in the event of disturbances. Disturbances can be caused e.g. by variable-speed drives,
rectifiers, actuators, noise filters, PLCs, or control electronics.
• Com Synchronisation via BS bus. The EDS only searches for insulation faults if the insulation fault location
has been started. It knows the time of the locating current pulse. Less time is needed for the
insulation fault location as with the setting “auto”.
• auto No synchronisation (e.g. if there is no BS bus or Modbus RTU). The EDS continuously searches for
insulation faults. If the BS address is set to 00, the device goes into the trigger mode “auto”.
9.1.3 Fault memory
Faults that only occur temporarily can be saved in the ISOMETER®.
• on After the cause of fault has been eliminated, alarm messages remain stored until a reset is carried
out.
• off The EDS exits the alarm mode as soon as the cause of fault has been eliminated.
9.2 Settings of inputs and outputs of the EDS44…-L
The settings of the EDS44…-L are done via the device menu of the ISOMETER®. For a detailed menu
description, refer to the manual of the ISOMETER®.
9.2.1 Digital inputs of the EDS44…-L (I1, I2)
The EDS44…-L features two digital inputs (I1 and I2 on the X1 plug), which can be individually configured.
low activelow active
I1
I2 A B
A B
M+
9.2.1.1 Functions
Selectable functions of the digital input
• off no function
• TEST Device self test
• RESET Reset of fault and alarm messages
EDS44x_D00201_10_M_XXEN/11.2023 51
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