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- ABB
- CM-MPS.21 1SVR630885R3300
- Three-Phase Monitoring Relay
- Sweden (SE)
- 100 × 22.5 × 78 mm
- 0.135 kg
- Xiamen, China
- New & In Stock
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Product Overview
The ABB CM-MPS.21 1SVR630885R3300 Three-Phase Monitoring Relay is a monitoring relay for supervising electrical conditions in three-phase systems. It is used in control panels to monitor the incoming three-phase supply and provide a switching signal when the monitored condition does not meet the configured requirements.
The relay is commonly applied in motor-control and machine-control circuits where the condition of the three-phase supply needs to be checked before equipment is allowed to operate. Its output can be incorporated into a contactor circuit, interlock circuit, alarm circuit, or PLC input.
In a pump control panel, the CM-MPS.21 can monitor the supply associated with the pump motor and influence the control circuit when an abnormal phase condition is detected. Similar arrangements can be used for fans, compressors, conveyors, machine tools, and other three-phase equipment.
For replacement work, technicians should verify the complete 1SVR630885R3300 order number, terminal wiring, monitoring configuration, and associated control circuit before removing the existing relay.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | ABB |
| Model | CM-MPS.21 |
| Order Number | 1SVR630885R3300 |
| Product Family | CM-MPS |
| Product Type | Three-Phase Monitoring Relay |
| Primary Function | Three-Phase Electrical Monitoring |
| System Role | Electrical Condition Monitoring and Control |
| Application | Motor Control / Machine Control |
| Dimensions | 100 × 22.5 × 78 mm |
| Weight | 0.135 kg |
Product Features
- ABB CM-MPS series three-phase monitoring relay
- Model CM-MPS.21
- Order number 1SVR630885R3300
- Monitors electrical conditions in three-phase systems
- Provides a relay output for control and interlocking functions
- Suitable for motor-control applications
- Can be incorporated into contactor control circuits
- Can provide a discrete signal to PLC-based systems
- Applicable to pumps, fans, compressors, conveyors, and industrial machinery
- Suitable for new control-panel installations and replacement projects
Working Principle
The CM-MPS.21 continuously evaluates the monitored three-phase electrical supply. The relay compares the detected electrical condition with its configured monitoring criteria and determines whether the supply is in an acceptable state.
A typical control sequence is:
Three-Phase Supply → CM-MPS.21 → Monitoring Evaluation → Relay Output → Contactor / PLC / Alarm
When the monitored condition is acceptable, the relay maintains the corresponding output state. When a monitored fault condition occurs, the output changes state and can be used by the control circuit to prevent equipment operation, disconnect a contactor, or initiate an alarm.
The monitoring relay therefore forms an interface between the electrical supply and the machine control system. It does not perform the main control logic; instead, it supplies a discrete electrical status that can be acted upon by downstream control equipment.
Role in a Three-Phase Motor Control Architecture
The CM-MPS.21 is positioned between the monitored electrical supply and the machine’s control circuit.
Three-Phase Supply → CM-MPS.21 → Control Circuit → Contactor → Motor
| System Element | Function |
|---|---|
| CM-MPS.21 | Monitors the condition of the three-phase supply |
| Circuit Breaker | Provides circuit protection and isolation |
| Motor Protection Device | Protects the motor against applicable electrical faults |
| Contactor | Switches the motor power circuit |
| PLC | Processes control and monitoring signals |
| HMI | Displays equipment operating and fault information |
| Alarm Circuit | Indicates an abnormal monitored condition |
| Three-Phase Motor | Operates from the controlled electrical supply |
Industrial Applications
| Application | Typical Use |
|---|---|
| Motor Control Panels | Supervising the electrical supply associated with motor starters |
| Pump Stations | Monitoring three-phase power for pump motors |
| Compressor Systems | Checking the electrical supply within compressor motor control circuits |
| Fan Systems | Supervising three-phase supply in ventilation and air-handling equipment |
| Conveyor Systems | Providing supply-condition monitoring for conveyor motors |
| Machine Tools | Incorporating electrical monitoring into machine interlock circuits |
| HVAC Equipment | Monitoring three-phase supply for industrial HVAC motors |
| Industrial Machinery | Providing an electrical condition signal to the machine control system |
Installation and Maintenance
- Confirm the complete CM-MPS.21 1SVR630885R3300 identification before installation.
- Isolate the relevant electrical circuit before wiring or replacing the relay.
- Check the existing three-phase connections and terminal arrangement.
- Verify the control-circuit connections associated with the relay output.
- Confirm the required monitoring settings before commissioning.
- Inspect the associated contactor, motor protection device, and circuit protection.
- Energize the system and verify the relay’s normal operating state.
- Test the output response according to the approved commissioning procedure.
- Confirm that the connected contactor, PLC input, or alarm circuit responds correctly.
- Inspect terminal connections during routine maintenance.
- Check the monitored supply if the relay indicates an unexpected fault.
- Record the final wiring and monitoring configuration for future maintenance.
Troubleshooting should consider both the monitored three-phase supply and the downstream control circuit. A problem with wiring, control voltage, contactor circuitry, or PLC input processing can produce symptoms that appear similar to a monitoring-relay fault.
Related Components
| Component | Function |
|---|---|
| ABB Contactors | Switch motor and other three-phase load circuits |
| ABB Motor Protection Devices | Provide motor protection functions |
| Circuit Breakers | Protect and isolate electrical circuits |
| ABB PLC Systems | Process monitoring and interlock signals |
| HMI | Displays machine and electrical status |
| Control Relays | Interface monitoring signals with control circuits |
| Terminal Blocks | Organize control-panel wiring |
| Three-Phase Motors | Typical equipment supervised by the monitoring circuit |
| Motor Starters | Combine switching and motor-control functions |
Recommended Related Models
| Model / Product Family | Product Type | Typical Application |
|---|---|---|
| ABB CM-MPS Series | Three-Phase Monitoring Relays | Monitoring three-phase electrical conditions |
| ABB CM-MPS.11 | Three-Phase Monitoring Relay | Three-phase supply monitoring |
| ABB CM-MPS.31 | Three-Phase Monitoring Relay | Electrical condition monitoring |
| ABB CM-MPS.41 | Three-Phase Monitoring Relay | Motor and machine monitoring |
| ABB CM-MPS.51 | Three-Phase Monitoring Relay | Three-phase control applications |
| ABB CM Series | Monitoring Relays | Electrical and automation monitoring |
| ABB CR-M Series | Interface Relays | Control-circuit signal interfacing |
Key Advantages
- Dedicated monitoring of three-phase electrical conditions.
- Relay output can be directly incorporated into control and interlock circuits.
- Suitable for motor-oriented control applications.
- Can interface with contactors, PLC inputs, and alarm circuits.
- Applicable to a wide range of three-phase industrial equipment.
- Useful for both control-panel construction and replacement work.
- Supports electrical condition monitoring without replacing the main machine controller.
- Fits naturally into conventional relay-based and PLC-based control architectures.
Technical FAQs
What is the ABB CM-MPS.21 used to monitor?
The CM-MPS.21 is used to supervise the electrical condition of a three-phase supply. Its monitoring function can be incorporated into a machine or motor control circuit to respond to abnormal electrical conditions.
Where is the CM-MPS.21 normally installed?
It is typically installed inside an electrical control panel as part of the monitoring and control circuit associated with three-phase equipment. Its output can be connected to a contactor circuit, PLC input, alarm circuit, or another control device.
Can the CM-MPS.21 be used in a PLC-controlled machine?
Yes. The relay output can be connected to a suitable PLC input so that the controller can use the monitoring status as part of its control or interlock logic. The exact wiring depends on the PLC input arrangement and control-panel design.
What should be checked when a CM-MPS.21 indicates an unexpected fault?
First check the monitored three-phase supply and the relay’s wiring. The associated control voltage, terminal connections, contactor circuit, motor protection equipment, and PLC or alarm input should also be checked before determining whether the monitoring relay itself requires replacement.