DOLD VARIMETER IMD RP 5898 Traduction des instructions originales - Page 3
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Function
Behaviour with internal device faults
If internal device faults were detected during the test function, the status
LED flashes with flash code 3. The indicator relays K1 and K2 switch to
the alarm state. The device faults are also indicated via Modbus.
Behavior on faulty connection
When detecting broken wire on terminals L(+)/L(-), the measurement is
disabled. The reaction time could be up to 2 min. The monitoring relays
K1 and K2 go in alarm state, the status LED shows flash code 1 in red
colour. After removing the interruption the fault is automatically reset
(max. reaction time up to 2 min) and the measurement of the insulation
resistance is continued. Stored alarm values remain stored. An interruption
of the protective earth connections PE1/PE2 causes the same reaction as
interrupting the measuring circuit, only the status LED shows flash code
2 in red colour. Broken wire detection on terminals L(+)/L(-) and PE1/PE2
are also indicated via Modbus.
External control input
To terminals X1/X2 an external combined Test-/Reset button can be
connected. If the terminals X1/X2 are bridged for approx. > 1,5 s and <
10 s the test mode is started. This has the same function as pressing the
internal test button. When bridging X1/X2 for < 1,5 s, a stored alarm will
be reset. This has the same function as pressing the internal reset button.
If X1/X2 is activated for > 10 s, the measuring function is stopped.
The measuring function remains suspended for the duration of the control of
X1/X2. The measuring function can also be stopped via Modbus command.
Connection of an external coupling device
An external coupling device (VSG) RL 5898 or RP 5898 can be connected
to extend the input voltage range of the monitored voltage system on
RN 5897/321. The terminals with the same legend of the insulation monitor
and the coupling device RL 5898 or RP 5898 (VSG1, VSG2, L(+), L(-)) are
connected together.
The network to be monitored is connected to terminals L1(+) und L2(-) on the
coupling device.Using the display menu in programming mode or via Modbus
the connection of the coupling device has to be selected and activated. The
broken wire detection is active on the terminals L1(+)/L2(-) on the coupling
device. A broken wire between coupling device and insulation monitor cannot
be detected immediately but the measured values on interruption of 1 or 2
wires between coupling device and insulation monitor are much lower as the
real values, which will cause an early response of the device.
Programming/setting of parameters/set-up of the insulation monitor
All settings are made via Maodbus. It is possible to adjust the response values
for alarm and pre-alarm, the relay operation principle, the alarm memory, the
broken wire detection, the type of network connection and the activation/
deactivation of the coupling device. The setting of the Modbus address and
baud rate is done via the three rotary switches on the front of the device.
The first two rotary switches ("Adr10" and "Adr1") set the Modbus address
between 1 and 99 in steps of 10 and 1, the third rotary switch ("Baud") sets
the baud rate.
Possible setting values are:
Position
potentiometer
1
2
3
Baud
Baud rate
1.2
2.4
4.8
kBaud
To avoid unauthorized manipulation, all three rotary switches are located
behind a sealable transparent cover.
Modbus RTU
For communication between motor controller and a supervising control
the Modbus RTU protocol according to Specification V 1.1b3 is used.
4
5
6
7
9.6
19.2
38.4
57.6
115.2
Function Diagram
Earth fault
R
pA
R
A
Hysteresis function
21-24
Open circuit operation
21-22
21-24
De-energized on trip
21-22
11-14
Open circuit operation
11-12
11-14
De-energized on trip
11-12
Manual reset
Reset
21-24
Open circuit operation
21-22
21-24
De-energized on trip
21-22
11-14
Open circuit operation
11-12
11-14
De-energized on trip
11-12
8
3
U H
R
E
t
t
M11593
12.07.22 en / 604A