Industries with 50% to 80% of motor loads must be protected, controlled, and monitored against numerous threats such as phase loss, overload, short circuits, and more. They use devices such as single-phase preventers for phase loss, thermal bi-metallic overload relay for overload, MPCB for overload, phase loss and short circuit, ELR for earth leakage, and more.
Monitoring devices such as an ammeter, voltmeter, and energy meter are also used for current, voltage, and power.
Electronic Motor Protection Relay (EMPR) helps you replace these devices and provides protection against current, voltage, and power. In this blog, we have explained in detail EMPR Working, Benefits, Features, and Protection.
Table of Contents
- What is EMPR
- Working of EMPR
- Benefits of EMPR
- Features of EMPR
- EMPR Ranges
- EMPR Applications
- FAQ’s on EMPR
What is EMPR?
The digital motor protection relay using the Micro Controller Unit (MCU), named Electronic Motor Protection Relay (EMPR), protects electric equipment such as the three-phase motor against overheating under normal and heavy starting conditions. EMPR is highly reliable in its accuracy and real-time data processing. LEDs on EMPR indicate the status of a system, and there are models which provide a display of load current, saving cause of failure, and communication functions.
EMPR is used to protect low voltage motors by replacing thermal overload relays, also known as electronic overcurrent relays.
Working of EMPR
- EMPR consists of MCU – Microcontroller Unit
- It precisely measures, monitors & displays the Motor’s current & voltage parameters & senses through the Current Transform (CT) & Potential transformer (PT) respectively
- It indicates / displays & stores the reason for fault after tripping
- Wide current measuring & setting scale
- Definite & Inverse Time – Trip Class 10,20,30 are programmable
Benefits of EMPR
- Cost Effective solution in one product
- Easily retrofitted
- Product Life is far better
- Communicable – RS485 Modbus / 4 to 20mA Analog output
- Power consumption- 0.5~1W
The trip class indicated above is as defined by IEC / IS and protective devices are designed considering these trip conditions. While conventional Bi-metallic thermal relays may satisfy one or two of the above, only an EMPR can offer all these curves
Current Based Protection includes: |
Voltage Based Protection includes: |
Power Based Protection includes: |
|---|---|---|
| Over/Under Current | Over Voltage | Over Power |
| Phase Failure | Under Voltage | Under Power |
| Short Circuit | Phase loss / Unbalance | Over Power Factor |
| Lock Rotor / Stall | Phase Reverse | Under Power Factor |
| Phase Unbalance | ||
| Phase Reverse | ||
| Ground Fault |
Features of EMPR
EMPR measures, monitors, controls, and displays the motor’s current, voltage and power parameters. All of which are detailed below
| Measure Element includes: | Motor Control | Additional Functions of EMPR |
|---|---|---|
| 3 phase Current | Local Operating | Instant power fail Restart |
| Reverse Current | Auto | Modbus RS485 / 4~20mA |
| Ground Current | Remote | Wide current Range (0.5A~100A) |
| Unbalance Ratio | Direct / Reverse | |
| Active/Reactive | Inductor | |
| Power (W/VAR) | Y-Delta | |
| Active/Reactive | Inverter | |
| Energy (WH/VARH) | ||
| Power Factor / THD | ||
| M/C Count | ||
| Event Recording | ||
| Event Wave | ||
| Motor total running | ||
| Hour | ||
| Motor running count |
EMPR Ranges
EMPR Applications
Industries having 50% to 80% of motor loads need to be protected and monitored against various protections. Electric Motor Protection Relays are used widely in Pump, Compressor motors, HVAC, Conveyor Systems, soft starters, Machinery, and other Single or Three Phase Equipment.
Buy LS Electric Motor Protection Relays at the best prices from Kreatronix Electric. We provide timely dispatch of genuine EMPR products along with the warranty. For inquiries, reach us at +91 9916755505 / 9916552020or esales@kreatronix.in / blrsales@kreatronix.in
FAQ’s on EMPR
1. Why should industries require EMPR?
Industries use devices such as Single phase preventer for phase loss, thermal bi-metallic overload relay for overload, MPCB for overload, phase loss and short circuit, ELR for earth leakage, and more.
Monitoring devices such as an ammeter, voltmeter, and energy meter are used for current, voltage, and power.
Using EMPR helps you replace all of these devices and provides protection against current, voltage, and power. It also provides additional protection such as insulation resistance and motor temperature
2. Why is the Thermal Overload relay replaced by the Electric Motor protection Relay/ Electronic Motor protection Relay/ Digital motor protection relay/ EMPR in industries?
- Thermal Overload relay works on the principle of Curvature of Bi-Metal – Wide margin of error.
Electronic Motor Protection Relay works on the principle of Micro-Controller Unit based – Real-time processing / High precision. - Thermal Overload relay provides protection against Overload, Open phase(part of ) – overload: set by motor rating current.
Electronic Motor Protection Relay provides protection against Overload, Open phase, Unbalance, Lock, Reverse phase, Ground fault, Instantaneous, etc. – overload: set by actual load current (< full load current). - Thermal Overload relay power consumption will be 5~12W.
Electronic Motor Protection Relay power consumption will be 0.5~1W only.
3. Is EMPR Trusted, Proven & Certified?
Yes, Our EMPR is Trusted, Proven & Certified by IEC (CE), UL (cUL), Safety certi (S), GB (CCC), etc.
