DOLD RN 5897/320 Terjemahan Petunjuk Asli - Halaman 2

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DOLD RN 5897/320 Terjemahan Petunjuk Asli
Function
The device is supplied with DC auxiliary voltage via terminals A1(+) / A2.
Switching on the auxiliary voltage (Power-On) is followed by an internal
self-test for 12 s (see „Device test functions"). The test process is visible
with the status LED. After this, measurement of the insulation resistance
in the measuring circuits begins and the status LED changes into green.

Measuring circuit

(Insulation measurement between terminals L1(+) / L2(-) on the
coupling device and PE1/PE2 on the insulation monitor)
The insulation monitor RN 5897/320 can only be used with a coupling
device. Max. mains voltage and connection diagrams have to be observed!
To connect the insulation Monitor RN5897/320 to a coupling device the
terminals with identical designations are connected (VSG1, VSG2, L(+),
L(-)) .The votage system to be monitored is connected to L1(+) und L2(-)
of the coupling device.
A broken wire detection that can be disabled provides a fault signal if
both terminals L1(+) and L2(-) are not linked by the connected network.
Broken wire between coupling device and insulation monitor cannot be
directly detected but the the measured value of the insulation resistance
when one or more connections are interrupted, is much lower then the real
insulation value which will cause a tripping of the alarm relays.
The type of the voltage system or the connection method (AC, DC, 3NAC)
has to be correctly adjusted on the rotational switch "UN"
Also the terminals PE1 and PE2 have to be connected with 2 separate
wires to the protective earth. An interruption of a wire also causes a fault
signal (see section "Behavior on faulty connection"). The monitoring of
the PE connection cannot be de-activated.
To measure the insulation resistance an active measuring voltage with
changing polarity is connected between L1(+) and L2(-) and PE1/PE2.
The duration of the positive and negative measuring phase depends on
the actual leakage capacity of the monitored system and in DC systems
also on the level and duration of possible voltage variations. This allows
a correct and fast measurement in different network conditions.
At the end of a measuring cycle the actual insulation resistance is produced
and indicated. The relays for alarm K1 and pre-alarm K2 switch when
dropping under the adjusted response values. In addition the status LED
changes to orange color on pre-alarm or to red color on alarm.
Manual reset of fault message
With the 2-section rotational switch "UN", manual or auto reset of the alarm
can be selected. If manual reset is activated the insulation fault signals
of the measuring circuit are stored when dropping under the adjusted
response values also if the insulation resistance goes back to healthy
state. Pressing the „Reset" button on the front side for 2 s, the alarm signal
is reset if the actual insulation resistance is in healthy state.
Indicator relay for insulation fault signal
The function of the relays K1 (contacts 11-12-14 for alarm) and K2 (contacts
21-22-24) can be altered between energised on trip (relay n.o.) or de-
energized on trip (relay n.c.). When energised on trip the relays energize
when the value drops below the setting, when de-energised on trip, the
relays de-energize when the value drops below the setting.
Disable the measuring function
Using the external control input X1/X2 the measuring function of the
RN 5897/320 can be disabled. This could be used when several isolated
voltage systems with individual insulation monitors need to be coupled.
The measuring voltage is set to -90V (negative measuring phase) and
the evaluation of the measurement is stopped. The status of the output
relays is frozen and not changed any more. If the measurement is disabled
the status LED flashes continuously orange. Please be aware, only the
evaluation of the measurement is stopped and the measuring pulse is
interrupted! A high resistive disconnection to PE does not take place
(see internal resistance).
Function
Broken wire detection
As described in section "Measuring circut", the measuring circuits L(1+)/
L2(-) and the protective conductors PE1/PE2 are constantly monitored for
wire breaks – not only at Power-On or a manual or occasional automatic
test. The response time of PE1/PE2 monitoring is only a few seconds.
The response time of monitoring of L1(+)/L2(-) can be up to approx.
2 min. Broken wire detection between L1(+) and L2(-) is performed via
coupled alternating voltage. This alternating voltage is short-circuited if
the terminals are connected to the connected mains at low-resistance.
The device detects that the mains to be monitored is properly connected.
Since this broken wire detection is carried out with alternating voltage, large
capacitances should be avoided between L1(+) and L2(-), since the
capacitive reactance of these capacitances also short-circuits this
alternating voltage. The device would no longer detect a connection fault
on L1(+)/L2(-).
Especially parallel lines should be prevented over larger distances.
If larger capacitances between L1(+)/L2(-) cannot be avoided or if the coupled
alternating voltage interferes with the system, the broken wire detection
can be de-activated on the 2-section rotational switch for alarm "RA". It
can be altered between continuously disabled (Broken Wire Detect OFF),
or continuously enabled (Broken Wire Detect ON) for 10 seconds every
2 minutes. If the broken wire detection on L1(+)/L2(-) is de-activated no
AC voltage is injected. The broken wire detection on PE1/PE2 cannot be
de-activated.
Device test functions
Principally, 2 different test functions are implemented: The "self-test" and
the "expanded test":
The self-test of the device is performed automatically after Power-On and
every full operating hours. It can also be triggered manually at any time by
pressing the "Test" button at the device front for 2 s.
With the self-test, contrary to the expanded test, the status of the Indicator
relays is not affected; the sequence is as follows:
The self test is indicated by the status LED with flash code 1 in orange colour.
First the negative measuring pules is activated for about 5 s and the internal
measuring circuit is checked on failures. Then the positive measuring pulse
is activated for about 5 s and more internal tests are performed. If no failures
are detected, the normal measurement continuous. The extended test is
started, when during or at the end of above procedure (12 s) the button
"Test" is pressed again for 2 s.
The procedure is the same as above (2 measuring phases with 5 sec
each) but in addition the output relays K1 and K2 go into alarm state. The
Status LED shows flash code 2 in orange colour. The test phases will be
continuously repeated. The extended test can be finished after the first
complete sequence (approx. 10 sec) by pressing the "reset" button for 2
seconds. The device starts the insulation monitoring again.
U
Self test (Test 1)
Insulation
measurement
measurement
Duration: approx. 12s
Positive
Measuring voltage
Negative
1)
Test signal
2)
Reset signal
Alarm
Relay state K1 and K2
No Alarm
1)
Test signal: Button Test > 2 s oder X1/X2 > 1,5 s und < 10 s
2)
Reset signal: Button Reset > 2 s oder X1/X2 < 1,5 s
To initiate the extended test (Test 2) the test signal must be operated
3)
within the self test (Test 1) again..
The reset signal has here no function, as the first complete sequence
4)
of extended test (Test 2) is not finished.
2
Self test (Test 1)
Continuous extended
Insulation
Duration: approx. 12s
test (Test 2)
Duration: approx. 10s
3)
4)
06.05.21 en / 393A
Insulation
measurement
t
M12462