ABB CM-EFS.2 Voltage Monitoring Relay for Single-Phase AC/DC Voltages
Introduction
The ABB CM-EFS.2 is a compact voltage monitoring relay designed for single-phase AC/DC systems. Part of ABB's CM range, it offers a wide selection of powerful and compact devices, all featuring a narrow 22.5 mm (0.89 in) width. This series provides voltage monitoring for over- and undervoltage protection across a range of 3 V to 600 V. Leveraging ABB's extensive experience, the CM range ensures high safety and reliability for electric installations.
Characteristics
- Monitoring of DC and AC voltages from 3-600 V
- TRMS measuring principle
- One device includes 4 measuring ranges
- Over- and undervoltage monitoring configurable
- ON- or OFF-delay configurable
- Open- or closed-circuit principle configurable
- Latching function configurable
- Threshold values for [overvoltage threshold] (>U) and [undervoltage threshold] (<U) adjustable
- Fixed hysteresis of 5%
- Tripping delay [TV] adjustable from 0 to 30 s
- 1x2 c/o contacts (common signal) or 2x1 c/o contact (separate signals for >U and <U) configurable
- 22.5 mm (0.89 in) width
- 3 LEDs for indication of operational states
Order Data
| Voltage monitoring relay | Rated control supply voltage | Measuring ranges | Order code |
|---|---|---|---|
| CM-EFS.2 | 24-240 V AC/DC | 3-30 V, 6-60 V, 30-300 V, 60-600 V | 1SVR430750R0400 |
Accessories
| Type | Description | Order code |
|---|---|---|
| ADP.01 | Adapter for screw mounting | 1SVR430029R0100 |
| MAR.02 | Marker label for devices with DIP switches | 1SVR430043R0000 |
| COV.01 | Sealable transparent cover | 1SVR430005R0100 |
Functions and Operating Controls
The relay features several controls and indicators on its front panel:
- 1. Adjustment of the hysteresis >U for overvoltage
- 2. Adjustment of the threshold value <U for undervoltage
- 3. Indication of operational states:
- U/T: [green LED] - indicates control supply voltage and timing status.
- R: [yellow LED] - indicates relay status.
- U: [red LED] - indicates overvoltage or undervoltage.
- 4. Adjustment of the tripping delay [TV]
- 5. Adjustment of the measuring range
- 6. DIP switches: Used for configuring operating modes such as ON/OFF delay, open/closed-circuit principle, and latching function.
Application and Operating Mode
The CM-EFS.2 relay is used for simultaneous monitoring of overvoltages (>U) and undervoltages (<U) in single-phase AC/DC systems. The output contacts can be configured as 1x2 c/o (common signal) or 2x1 c/o (separate signals for >U and <U). The operating principle can be set to open-circuit or closed-circuit, and an adjustable ON- or OFF-delay is available. A latching function can also be configured.
The unit is adjusted using potentiometers and DIP switches. Four measuring ranges are available: 3-30 V, 6-60 V, 30-300 V, and 60-600 V. The threshold values for overvoltage and undervoltage, as well as the tripping delay [TV], are adjustable. The hysteresis is fixed at 5%.
Function Diagrams (Textual Description)
Open-circuit principle, ON-delayed, without latching
When the measured voltage is within the normal operating range (between the [undervoltage threshold] <U and the [overvoltage threshold] >U, considering 5% hysteresis), the [green LED] indicates control supply is active, and the output relays are de-energized. If the measured voltage exceeds the [overvoltage threshold] (>U) or drops below the [undervoltage threshold] (<U), the [red LED] indicates the fault (glowing for overvoltage, flashing for undervoltage), and the [tripping delay TV] begins. Once the [tripping delay TV] is complete, if the voltage remains outside the normal range (adjusted by hysteresis), the output relays energize, and the [yellow LED] glows. If the measured voltage returns within the normal range (within hysteresis), the output relays de-energize, and both the [red LED] and [yellow LED] turn off. If the supply voltage is interrupted, the [green LED] turns off.
Open-circuit principle, OFF-delayed, without latching
When the measured voltage is within the normal operating range, the [green LED] is ON, and the output relays are de-energized. If the measured voltage exceeds the [overvoltage threshold] (>U) or drops below the [undervoltage threshold] (<U), the output relays energize, the [yellow LED] glows, and the [red LED] glows (overvoltage) or flashes (undervoltage). After the [tripping delay TV], if the voltage returns within the normal range (considering hysteresis), the output relays de-energize, and the [yellow LED] turns off. If the supply voltage is interrupted, the [green LED] turns off.
Open-circuit principle, ON-delayed, with latching
When the measured voltage is within the normal range, the [green LED] is ON, and output relays are de-energized. If voltage exceeds >U or drops below <U, the [red LED] indicates the fault, and the [tripping delay TV] starts. After [tripping delay TV], if voltage remains out of range (with hysteresis), output relays energize, and the [yellow LED] flashes. If voltage returns within range (with hysteresis), the [red LED] turns off, but the output relays remain energized (latching). If supply voltage is interrupted (reset), output relays de-energize, and the [yellow] and [green LEDs] turn off.
Open-circuit principle, OFF-delayed, with latching
When the measured voltage is within the normal range, the [green LED] is ON, and output relays are de-energized. If voltage exceeds >U or drops below <U, the output relays energize, the [yellow LED] flashes, and the [red LED] glows (overvoltage) or flashes (undervoltage). After the [tripping delay TV], if voltage returns within range (with hysteresis), the [red LED] turns off, and the output relays remain energized (latching). If supply voltage is interrupted (reset), the output relays de-energize, and the [yellow] and [green LEDs] turn off.
Closed-circuit principle, ON-delayed, without latching
When supply voltage is applied, the output relays energize, and the [green] and [yellow LEDs] glow. If the measured voltage exceeds >U or drops below <U, the [red LED] indicates the fault, and the [tripping delay TV] starts. After [tripping delay TV], if voltage remains out of range (with hysteresis), the output relays de-energize, and the [yellow LED] turns off. If voltage returns within range (with hysteresis), the output relays re-energize, the [yellow LED] glows, and the [red LED] turns off. If supply voltage is interrupted, the output relays de-energize, and the [yellow] and [green LEDs] turn off.
Closed-circuit principle, OFF-delayed, without latching
When supply voltage is applied, the output relays energize, and the [green] and [yellow LEDs] glow. If the measured voltage exceeds >U or drops below <U, the output relays de-energize, the [yellow LED] turns off, and the [red LED] glows (overvoltage) or flashes (undervoltage). After the [tripping delay TV], if voltage returns within range (with hysteresis), the [red LED] turns off, and the output relays energize, with the [yellow LED] glowing. If supply voltage is interrupted, the output relays de-energize, and the [yellow] and [green LEDs] turn off.
Closed-circuit principle, ON-delayed, with latching
When supply voltage is applied, the output relays energize, and the [green] and [yellow LEDs] glow. If the measured voltage exceeds >U or drops below <U, the [red LED] indicates the fault, and the [tripping delay TV] starts. After [tripping delay TV], if voltage remains out of range (with hysteresis), the output relays de-energize, and the [yellow LED] flashes. If voltage returns within range (with hysteresis), the [red LED] turns off, and the output relays remain de-energized (latching). If supply voltage is interrupted (reset), the [yellow] and [green LEDs] turn off, and the output relays re-energize upon re-application of supply voltage.
Closed-circuit principle, OFF-delayed, with latching
When supply voltage is applied, the output relays energize, and the [green] and [yellow LEDs] glow. If the measured voltage exceeds >U or drops below <U, the output relays de-energize, the [yellow LED] flashes, and the [red LED] glows (overvoltage) or flashes (undervoltage). After the [tripping delay TV], if voltage returns within range (with hysteresis), the [red LED] turns off, and the output relays remain de-energized (latching). If supply voltage is interrupted (reset), the [yellow] and [green LEDs] turn off, and the output relays re-energize upon re-application of supply voltage.
Technical Data
| Parameter | Specification |
|---|---|
| Input circuit | |
| Supply circuit: Rated control supply voltage [US] | 24-240 V AC |
| Rated control supply voltage tolerance | -15...+10% |
| Rated frequency | 50/60 Hz |
| Current / power consumption | 24 V DC: 30 mA / 0.75 W 115 V AC: 17 mA / 1.9 VA 230 V AC: 11 mA / 2.6 VA |
| On-period | 100% |
| Power failure buffering time | 20 ms |
| Transient overvoltage protection | varistors |
| Measuring circuit | |
| Monitoring function | Over- and undervoltage monitoring configurable |
| Measuring method | TRMS measuring principle |
| Measuring inputs | Terminal connection B-C |
| Measuring range | 3-30 V, 6-60 V, 30-300 V, 60-600 V |
| Input resistance | 600 kΩ |
| Pulse overload capacity (t < 1 s) | 800 V |
| Continuous capacity | 660 V |
| Threshold value | >U and <U adjustable within the indicated measuring range |
| Tolerance of the adjusted threshold value | 10% of the range end value |
| Hysteresis related to the threshold value | 5% fixed |
| Measuring signal frequency range | DC / 15 Hz - 2 kHz |
| Rated measuring signal frequency range | DC / 50-60 Hz |
| Maximum response time | AC: 80 ms DC: 120 ms |
| Accuracy within the control supply voltage tolerance | ΔU ≤ 0.5% |
| Accuracy within the temperature range | ΔU ≤ 0.06% / °C |
| Transient overvoltage protection | varistors |
| Timing circuit | |
| Delay time [TV] | 0 or 0.1-30 s adjustable |
| Repeat accuracy (constant parameters) | ±0.07% of full scale |
| Tolerance of the adjusted delay time | Δt ≤ 0.5% |
| Accuracy within control supply voltage tolerance | Δt ≤ 0.5% |
| Accuracy within temperature range | Δt ≤ 0.06% / °C |
| Indication of operational states | |
| Control supply voltage | U/T: [green LED] - control supply voltage applied |
| Measured value | U: [red LED] - overvoltage or undervoltage R: [yellow LED] - relay status (energized/de-energized, latching status) |
Output Circuits
The relay provides two sets of changeover (c/o) contacts:
- Kind of output: 1 x 2 c/o contacts (common signal) or 2 x 1 c/o contact (separate signals for >U and <U) configurable.
- Operating principle: Configurable as open-circuit or closed-circuit principle. In open-circuit, relays energize when voltage is outside the set thresholds. In closed-circuit, relays de-energize when voltage is outside the set thresholds.
- Contact material: AgNi
- Rated operational voltage [Ue]: 250 V
- Minimum switching voltage / current: 24 V / 10 mA
- Maximum switching voltage / current: 250 V AC / 4 A AC
- Rated operational current [Ie]: AC12 (resistive) at 230 V: 4 A; AC15 (inductive) at 230 V: 3 A; DC12 (resistive) at 24 V: 4 A; DC13 (inductive) at 24 V: 2 A.
- AC rating (UL 508): Utilization category B 300, max. rated operational voltage 300 V AC, max. continuous thermal current 5 A.
- Mechanical lifetime: 30 x 106 switching cycles
- Electrical lifetime (AC12, 230 V, 4 A): 0.1 x 106 switching cycles
- Maximum fuse rating for short-circuit protection: n/c contact: 6 A fast-acting; n/o contact: 10 A fast-acting.
Dimensions
The CM-EFS.2 relay has a width of 22.5 mm (0.89 in). Its overall dimensions are approximately 22.5 mm (width) x 78 mm (height) x 100 mm (depth).
Accessory ADP.01 (Adapter for screw mounting) has dimensions of 62.5 mm x 70 mm.
Accessory MAR.02 (Marker label) is a small label for DIP switches.
Accessory COV.01 (Sealable transparent cover) is a protective cover.
Further Documentation
- Document title: Electronic products and relays, Document type: Technical catalogue, Document number: 2CDC110004C020x
- Document title: CM-EFS.2, Document type: Instruction manual, Document number: 1SVC437752M1000
Further documentation can be found on the internet at: www.abb.com/lowvoltage > Control Products > Electronic Relays and Controls > Single Phase Monitors.
Contact Us
ABB STOTZ-KONTAKT GmbH
P. O. Box 10 16 80
69006 Heidelberg, Germany
Phone: +49 (0) 6221 7 01-0
Fax: +49 (0) 6221 7 01-13 25
E-mail: info.desto@de.abb.com
For local sales organization addresses, visit: www.abb.com/contacts > Low Voltage Products and Systems.
Note: ABB reserves the right to make technical changes or modify document contents without prior notice. ABB does not accept responsibility for potential errors or lack of information. Reproduction or disclosure of contents is forbidden without prior written consent of ABB AG. Copyright © 2010 ABB. All rights reserved.
