Function; Device Features; Device-Specific Instructions; Functional Description - Bender ISOMETER iso415R Manual

Function

2 Function
2.1

Device features

• Monitoring of the insulation resistance for unearthed 3(N)AC, AC and DC systems with galvani-
cally connected rectifiers
• Automatic adaptation to the system leakage capacitance up to 25 μF
• Response time ≤ 6 s at C
• Automatic device self test with connection monitoring
• Two separately adjustable response value ranges from 5 kΩ...1000 kΩ
• Alarms are output via LEDs (AL1, AL2) and an alarm relay
• Selectable N/C or N/O relay operation
• Selectable start-up delay, response delay and delay on release
• Fault memory 1
• RS-485 interface with Modbus RTU protocol
• NFC interface
2.2

Device-specific instructions

i
Operation inside a control cabinet.
Device signals must be visually perceptible outside the control cabinet.
i
IT systems with several ISOMETER®s.
Only one ISOMETER® may be installed in a galvanically connected system. In IT sys-
tems that are interconnected via coupling switches, ISOMETER®s that are not re-
quired must be disconnected from the IT system or deactivated. If IT systems are
coupled via capacitances or diodes, central control of the various ISOMETER®s must
be provided.
i
Prevent measurement errors!
In galvanically coupled DC circuits, an insulation fault can only be detected correctly
if a minimum current of > 10 mA flows through the rectifiers.
2.3

Functional description

The iso415R is used to monitor the insulation fault
systems. In addition to the limit value comparison, functions for connection monitoring, detection
of device-internal errors and exceeding the maximum permissible leakage capacitance C
available.
The measured value R
trol panel and can be read out via the interfaces (Modbus RTU and NFC). Furthermore, the mes-
sages and alarms are also output via relay K1, depending on the alarm assignments that can be
set via the interfaces.
1 with app and Modbus RTU
8 iso415R-x_D00401_00_M_XXEN / 04.2021
= 1µF and R = Ran/2
e f
1
as well as all messages and alarms are displayed via the LEDs on the con-
F
1
and to determine its location in unearthed
F
are
e