Measuring and monitoring relaysSingle- and three-phase
Current and voltage monitoring relaysMonitoring the parameters ofsingle-phase mains
Applications of current and voltage monitoring relays in single-phase mains
For the monitoring of currents and voltages in single-phase AC/DC systems, ABB’s CM range contains a wide selection of powerful and compact devices all in only 22.5 mm wide. This meauring range includes current and voltage monitoring relays for over- and undercurrent protection, over- and undervoltage protection and phase loss monitoring – from 3 mA to 15 A and from 3 V to 600 V. Incorporating ABB’s long-term experience the CM range provides highest safety and reliability for your electric installation.
Current monitoring
The ABB current monitoring relays CM-SRS.xx reliably monitor currents which exceed or fall below the selected thresholdvalue. The functions overcurrent or undercurrent monitoring can be preselected. Single- and multifunction devices formonitoring of direct or alternating currents from 3 mA to 15 A are available.
Current window monitoring (I
min, Imax)
The window monitoring relay CM-SFS.2x is the right solution if the application requires the simultaneous monitoring of over- and undercurrents.
Voltage monitoring
The ABB voltage monitoring relays CM-ESS.xx are used to monitor direct and alternating voltages within a range of 3 to 600 V.Over- or undervoltage detection can be preselected.
Voltage window monitoring (Umin, Umax)
For the simultaneous detection of over- and undervoltages, the window monitoring relay CM-EFS.2 can be used.
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Three-phase monitoring relaysMonitoring the parameters inthree-phase mains
Applications for three-phase monitoring relays in three-phase mains
Only reliable and continuous monitoring of three-phase networks guarantees trouble-free and economic operation ofmachines and installations. Thus, the three-phase monitoring relays of the CM range monitor the phase voltages,phase sequence, phase unbalance and phase loss.
Monitoring for over- and undervoltage
All electric devices can be damaged when operated continuously at voltages over or under their rated values. An overvoltagecould potentially cause heating within the device. If the temperature is unduly high, component parts and thus whole devices orinstallations may fail or may be destroyed. Undervoltages involve the risk that the switching elements reach an undefined state.In this case, parts of the installation still function, but not others. This misoperation can result in damage of the product orinstallation. In the worst case, wrong voltages may even cause harm to the operating personnel.
Phase unbalance monitoring
If the supply by the three-phase system is unbalanced due to uneven distribution of the load, the motor will convert a part of the energy into reactive power. This energy gets lost unexploited; also the motor is exposed to higher thermal strain. Other thermal protection devices fail to detect continuing unbalances which can lead to damage or destruction of the motor.The CM range three-phase monitoring relays with phase unbalance monitoring can reliably detect this critical situation.
Phase failure detection
In case of a phase loss, undefined states of the installation are likely to occur. E.g. the startup process of motors is disturbed.All three-phase monitoring relays of the ABB CM range detect a phase loss as soon as the voltage of one phase drops below60 % of its nominal value.
Phase sequence monitoring
A change of the phase sequence during operation or an incorrect phase sequence that is applied at start-up will cause athree-phase motor to run with reverse rotation. Certain motors when operated in the reverse direction will cause severedamage to connected loads such as pumps, screw compressors and fans. Especially for non-fixed or portable equipment,such as construction machinery, phase sequence detection prior to the start-up process is highly recommended. ABB offersthree-phase monitoring relays with selectable phase sequence monitoring. This provides the capability of ignoring phasesequence conditions for applications, such as motors with forward and reverse rotation, where the phase sequence isunimportant.
Interrupted neutral
Under normal conditions, individual phase voltages are equal and the load causes the individual phase currents to vary.Systems that have neutral conductors accommodate this variation by a compensating current flow through the neutralconductor. If the neutral conductor breaks, the compensating current can no longer flow. As a result, the voltage is dividedasymmetrically on the individual phases. This means that over- and undervoltages are produced in the individual phases andthese can damage or even destroy the connected consumers. ABB offers three-phase monitoring relays that monitor theneutral conductor for interrupted neutral. The interruption of the neutral is detected by means of phase balance monitoring.
Automatic phase sequence correction
The new generation of ABB three-phase monitoring relays offers devices with automatic phase sequence correction. If phasesequence monitoring and phase sequence correction are activated, and in conjunction with a reversing contactor combination,it is ensured that for any non-fixed or portable equipment, e.g. construction machinery, the correct phase sequence is appliedto the input terminals of the load.
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Current and voltage monitoring relaysfor single-phase AC/DC currents
Current monitoring relays Voltage monitoring relays
Single-phase voltage and current monitoring relays protect sensitive equipment and control systems againstundervoltage (brownout) or undercurrent events or overvoltage or overcurrent events. Different units with adjustable orfixed threshold values (trip points) are available.
All devices are available with two different terminal versions. You can choose between the proven screw connectiontechnology (double-chamber cage connection terminals) and the completely tool-free Easy Connect Technology (push-in terminals).
Characteristics of current monitoring relays Characteristics of voltage monitoring relays
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− Monitoring of DC and AC currents (3 mA to 15 A) − TRMS measuring principle |
− Monitoring of DC and AC voltages (3-600 V) − TRMS measuring principle |
− One device includes 3 measuring ranges − One device includes 4 measuring ranges
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− Over- and/or undercurrent monitoring configurable 1) − CM-SFS.2 and CM-SRS.M: Latching function configurable |
− Over- and/or undervoltage monitoring configurable 1) − CM-ESS.M and CM-EFS.2: Latching function configurable |
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− Hysteresis adjustable (3-30 %) or fixed hysteresis (5 %) 1) − Precise adjustment by front-face operating controls − Screw connection technology or |
− Hysteresis adjustable (3-30 %) or fixed hysteresis (5 %) 1) − Precise adjustment by front-face operating controls − Screw connection technology or |
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Easy Connect Technology available − Housing material for highest fire protection classification |
Easy Connect Technology available − Housing material for highest fire protection classification |
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UL 94 V-0 UL 94 V-0
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− Tool-free mounting on DIN rail as well as demounting − 22.5 mm (0.89 in) width |
− Tool-free mounting on DIN rail as well as demounting − 22.5 mm (0.89 in) width |
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− 3 LEDs for status indication 1) depending on device |
− 3 LEDs for status indication 1) depending on device |
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Approvals for current and voltage monitoring relays |
Marks for current and voltage monitoring relays |
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A UL 508, CAN/CSA C22.2 No.14 a CE
C GL b C-Tick
EAC
K CB Scheme
E CCC
L RMRS
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Single- / multifunctional monitoring relaysfor monitoring of three-phase mains
Singlefunctional Multifunctional
The reliable and continuous monitoring of three-phase networks guarantees trouble-free and economic operation ofmachines and installations.
The most multifunctional devices in the EPR assortment are the CM-MPS/N monitoring relays for rated voltage levelsup to 820 V AC and 400 Hz. Additionally a variety of economic and cost-efficient three-phase monitoring relays areoffered in this range with specialized functionality.
Most devices are available with two different terminal versions. You can choose between the proven screw connectiontechnology (double-chamber cage connection terminals) and the completely tool-free Easy Connect Technology (push-in terminals).
Characteristics Approvals
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− Monitoring of three-phase mains for phase sequence (can be switched off), phase failure, phase unbalance over- and undervoltage 1) − TRMS measuring principle − Threshold values are adjustable as absolute values 1) − Powered by the measuring circuit − Precise adjustment by front-face operating controls − Screw connection technology or Easy Connect Technology available − Housing material for highest fire protection classification |
A UL 508, CAN/CSA C22.2 No.14 (not for CM-MPN.72) C GL (not for devices in E-housing) R EAC K CB Scheme (CM-PAS, CM-PSS, CM-PVS pending) E CCC L RMRS (not for CM-PFS) |
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UL 94 V-0 − Tool-free mounting on DIN rail as well as demounting − S-range: 22.5 mm (0.89 in) width − N-range : 45 mm (1.78 in) width − 3 LEDs for status indication 1) depending on device |
Marks a CE b C-Tick (CM-PVS.81 pending) |
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