EATON EMR6-R400-A-2 Electric Insulation Monitoring Relays Instructions

EATON EMR6-R400-A-2 Electric Insulation Monitoring Relays

Technical data

according to IEC/EN 61557-8
Internal impedance Zi min. at 50 Hz| 155 kOhm
Peak value of Um| 24 V +10 %
Max. value of Im| 0.15 mA
Max. system leakage capacitance Ce| 20 µF
Max. DC voltage Ufg| 460 V DC
Test voltage|
supply circuit / output circuit| 2.32 kV 50 Hz, 2 s
supply circuit / measuring circuit| 2.32 kV 50 Hz, 2 s
measuring circuit / output circuit| 2.53 kV 50 Hz, 1 s
Electrical data for the contact circuits and the interface
Min. switching voltage / current| 24 V / 10 mA
Max. switching voltage / current| see load limit curves in data sheets
Rated operational current Ie (IEC/EN 60947-5-1)|
AC-12 (resistive) 230 V| 4 A
AC-15 (inductive) 230 V| 3 A
DC-12 (resistive) 24 V| 4 A
DC-13 (inductive) 24 V| 2 A
Internal resistance Ri of the

measuring circuit                                     min.

|

185 kOhm

Additional information relating to cULus approval

For use in Pollution Degree 2 Environment

Minimum distances to other units

In the case of continuously measured voltage > 400 V, lateral spacing to other units has to be min. 10 mm (0.39 in).

Only one CM-EMR6-R in a galvanically connected network

• • • DIP switch position
• Remote test
• Fault storage and reset

Wiring diagrams

For monitoring of mains with higher voltages, use coupling unit EMR6-RC690

Always connect L+ and L- to different conductors. L+ and L- can be connected to any of the conductors

Front view with operating controls

• Indication of operational states with LEDs
  • U: green LED – Status indication of control supply  voltage VControl supply voltage applied
  • F: red LED  – Fault message
  • R: yellow LED – Status indication of the output relays
• Adjustment of the tens figure of the threshold value 1 (=warning)
• Adjustment of the units figure of the threshold value 1
• Adjustment of the tens figure of the threshold value 2 (= prewarning)
• Adjustment of the units figure of the threshold value 2 f Test / Reset

LEDs, status information and fault messages

1. Depending on the configuration (see function diagrams)
2. Possible faulty setting: The threshold value for warning is set at a higher value than the threshold value for prewarning.
3. The device has triggered after an insulation fault. The fault has been stored and the insulation resistance has returned to a higher value than the threshold value plus hysteresis.
4. Depending on the fault

DIP switch functions

DIP switches for the adjustment of:

1. ON = Closed-circuit principle OFF = Open-circuit principle
2. ON = Non-volatile fault storage ON OFF = Non-volatile fault storage OFF
3. ON = Interrupted wire detection ON OFF = Interrupted wire detection OFF
4. ON = 2 threshold values (2 x 1 c/o contact) OFF = 1 threshold value (1 x 2 c/o contacts) (R2.x disabled)
   Default setting: All DIP switches in position OFF

DIP switch position

Electrical connection

• A1-A2 Control supply voltage Us
• L+, L-, KE, w Measuring input
• 11-12/14 Output relay 1
• 21-22/24 Output relay 2
• VS, V1+, V1- Connection for coupling unit EMR6-RC690
• S1, S2, S3   Control inputs, volt-free triggering

Remote test

Fault storage and reset

Function diagrams

1. Insulation resistance monitoring w/o fault storage e, auto reset, 1 x 2 c/o j
2. Insulation resistance monitoring with fault storage f, manual reset, 1 x 2 c/o j
3. Insulation resistance monitoring w/o fault storage e, auto reset, 2 x 1 c/o I
4. Insulation resistance monitoring with fault storage f, manual reset, 2 x 1 c/o I

Function diagrams

• Insulation resistance monitoring without fault storage, auto reset, 1 x 2 c/o contacts
• Insulation resistance monitoring with fault storage, manual reset, 1 x 2 c/o contacts
• Insulation resistance monitoring without fault storage, auto reset, 2 x 1 c/o contact
• Insulation resistance monitoring with fault storage, manual reset, 2 x 1 c/o contact
  • Control supply voltage
  • Remote Test
  • Remote Reset
  • Measured value
  • Hysteresis
  • Threshold value
  • Open-circuit principle
  • Output relay 1
  • Output relay 2
  • Green LED
  • Red LED
  • Yellow LED
  • Closed-circuit principle
  • Start-up time ts, min. 15 s, fixed
  • Prewarning
  • Warning

Monitoring functions

The EMR-R400-A-2 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. The insulation resistance between system lines and system earth is measured. If this falls below the adjustable threshold values, the output relays switch into the fault state. Measured input voltage: 0-600 V DC or 0-400 V AC, 15-400 Hz The device can monitor control circuits (single-phase) and main circuits (3-phase).

Measuring principle

With the EMR-R400-A-2 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 the 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 next measurement cycle and is smaller than the set threshold value, the output relays switch to the fault state. This measuring principle is also suitable for the detection of symmetrical insulation faults.

Additional monitoring functions

When interrupted wire detection is activated u, the EMR-R400-A-2 automatically controls the system /measuring circuit connections L+ and L- when the system starts up. This can be repeated at any time by activating the test function. The EMR-R400-A-2 cyclicly monitors the measuring circuit connections w and KE for wire interruption. In case of a wire interruption in one of the connections, the output relays switch to the fault state. 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 relays switch to the fault state. Also incorrect settings that could cause a faulty function of the device are monitored. When the device detects such an incorrect setting, the output relays switch to the fault state.

Operating mode

The system to be monitored is connected to terminals L+, L- . The earth potential is connected to terminals w and KE. Depending on the setting, the device operates according to the open-circuit principle h – fault state: relay energized or closed-circuit principle g – 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 relays switch into the operational state.

Configuration 1 x 2 c/o contacts

With this configuration, the settings for the threshold value for prewarning (R2) have no influence on the operating function. If the measured value drops below the set threshold value, the output relays switch into the fault state. If the measured value exceeds the threshold value plus hysteresis, the output relays switch back into their original state.

Configuration 2 x 1 c/o contact (prewarning and warning):

If the measured value drops below the set threshold value for prewarning the second output relay 21-22/24 switches. If the measured value drops below the threshold value for warning, the first output relay 11-12/14 switches. If the measured value exceeds the threshold value for warning plus hysteresis, the first output relay 11-12/14 switches back into its original state. If the measured value exceeds the threshold value for prewarning plus hysteresis, also the second output relay 21-22/24 switches back to its original state. All operating states are signalled by the front-face LEDs. See table „LEDs, status information and fault messages“

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 relays switch to the fault state as long as the test button is pressed, the control contact S1-S3 is closed or the test functions are processed.

Fault storage, reset function

When fault storage (f) is active, the output relays remain in the fault state and only switch back to their original state 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(s) plus hysteresis. The fault storage is designed non-volatile (remanent). This means that after switch-off and return of the control supply voltage the device returns to the state it was prior to the switch-off until a reset is executed.

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