Insulation monitoring relay CM-IWS.1
For unearthed AC, DC and mixed AC/DC systems up to U n = 250 V AC and 300 V DC
The CM-IWS.1 serves to monitor insulation resistance in
accordance with IEC 61557-8 in unearthed IT AC systems, IT AC systems with galvanically connected DC circuits, or unearthed IT DC systems with a voltage up to 250 V AC and 300 V DC. It can be configured to the requirements of the applications and therefore used multi-functional.
Characteristics
–For monitoring the insulation resistance of unearthed IT systems
up to U n = 250 V AC and 300 V DC
–According to IEC/EN 61557-8 “Electrical safety in low voltage
distribution systems up to 1000 and 1500 – Equipment for testing, measuring or monitorin
g of protective measures – Part 8: Insulation monitoring devices for IT systems" –Rated control supply voltage 24-240 V AC/DC
–Prognostic measuring principle with superimposed square wave
signal
–One measuring range 1-100 k Ω
–Precise adjustment of the threshold value in 1 k Ω steps –Interrupted wire detection
–Fault storage / latching configurable by control input – 1 c/o (SPDT) contact, closed-circuit principle –22.5 mm (0.89 in) width – 3 LEDs for status indication
Order data
Insulation monitoring relay
Type Nominal voltage U n of the distribution system to be monitored
Rated control supply voltage
Order code
CM-IWS.1
0-250 V AC / 0-300 V DC
24-240 V AC/DC
1SVR 630 660 R0100
Accessories
Type Description
Order code
ADP .01Adapter for screw mounting 1SVR 430 029 R0100MAR.01Marker label
1SVR 366 017 R0100COV.01
Sealable transparent cover
1SVR 430 005 R0100
Approvals
A UL 508, CAN/CSA C22.2 No.14
C GL pending K IEC/EN 60947-5-1, CB scheme E GB14048.5 - 2001, CCC D
GOST
Marks
a CE b
C-Tick
2 - Insulation monitoring relay CM-IWS.1 | Data sheet
Functions Operating controls
2C D C 251 078 S 0009
123
4
1 Test and reset button
2 Status indication
U: green LED - control supply voltage F: red LED - fault message R: yellow LED - relay status
3 Configuration and setting
Front-face rotary switches for threshold value adjustment:R.1 for R1 tens figures:
0, 10, 20, 30, 40, 50, 60, 70, 80, 90 k Ω in ten k Ω steps R.2 for R1 units figures:
1, 2, 3, 4, 5, 6, 7, 8, 9, 10 k Ω in one k Ω steps 4 Marker label
Application / monitoring function
The CM-IWS.1 serves to monitor insulation resistance in accordance with IEC 61557-8 in unearthed IT AC systems, IT AC systems with galvanically connected DC circuits, or IT DC systems.
The insulation resistance between system lines and system earth is measured. If this falls below the adjustable threshold values, the output relay de-energizes.
The device can monitor control circuits (single-phase) and main circuits (3-phase).
Supply systems with voltages U n = 0-250 V AC (15-400 Hz) or 0-300 V DC can be directly connected to the measuring inputs and their insulation resistance being monitored. For systems with voltages above 250 V AC and 300 V DC the insulation monitoring relay CM-IWN.x with or without the coupling unit CM-IVN can be used.Measuring principle硝酸钙溶液
A pulsating measuring signal is fed into the system to be monitored and the insulation resistance calculated.
This pulsating measuring signal alters its form depending on the insulation resistance and system leakage capacitance. From this altered form the change in the insulation resistance is forecast.
When the forecast insulation resistance corresponds to the insulation resistance calculated in the ne
xt measurement cycle and is smaller than the set threshold value, the output relay de-energizes. This measuring principle is also suitable for the detection of symmetrical insulation faults.Additional monitoring functions
The CM-IWS.1 cyclically monitors the measuring circuit connections w and KE for wire interruption. In case of a wire interruption in one of the connections, the output relay de-engergizes.
In addition, the unearthed AC-, DC- or AC/DC system is monitored for inadmissible system leakage capacitance. If the system leakage capacitance is too high, the output relay de-energizes.
Operating mode
The system to be monitored is connected to terminals L+ and L-. The earth potential is connected to terminals w and KE.
The device operates according to the closed-circuit principle (fault state: relay de-energized).
Once the control supply voltage has been applied the insulation monitoring relay runs through a system test routine.
The system is diagnosed and the settings are tested. If no internal or external faults are found after this test routine is completed, the output relay energizes.
If the measured value drops below the set threshold value, the output relay de-energizes. If the measured value exceeds
the threshold value plus hysteresis, the output relay re-energizes.
All operating states are signalled by the front-face LEDs. See table "LEDs, status information and fault messages" on
page 6.
分火头Test function
The test function is only possible when there is no fault.
By pressing the front-face combined test/reset button a system test routine is executed. The output relay remains de-energized as long as the test/reset button is pressed, the control contact S1-S3 is closed or the test functions are processed.
The test function can be activated either with the front-face combined test/reset button or with a remote test button connected as shown in the picture.
Fault storage, reset function and remote reset
The output relay remains de-energized and only energizes after the combined test/reset button is pressed or after the remote reset (terminals S2-S3) is activated, and when the insulation resistance is higher than the set threshold value plus hysteresis.
Data sheet| Insulation monitoring relay CM-IWS.1 - 3
Function descriptions/diagrams
G Control supply voltage not applied / Output contact open / LED OFF
B Control supply voltage applied / Output contact closed / LED ON
Insulation resistance monitoring w/o fault storage, auto reset
Insulation resistance monitoring with fault storage, manual reset
4 - Insulation monitoring relay CM-IWS.1 | Data sheet
Data sheet | Insulation monitoring relay CM-IWS.1 - 5
Connection and wiring Connection diagram
Wiring diagrams
Always connect L+ and L- to different conductors. L+ and L- can be connected to any of the conductors.U n ≤ 250 V AC; 300 V DC
2-wire AC system
3-wire AC system
夜尿停
2-wire DC system
3-wire DC system
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