Solcon MPR-6 Motor Protection Relay

Product Information

Manufacturer	Solcon (Solcon Industries, Israel)
Model	MPR-6
Product	Digital Motor Protection Relay
Front Panel	LCD display; LEDs On, Start/Run, Alarm/Fault; keys Page, Select, Up, Down, Select/Reset, Store
Part / Serial Number, Supply Voltage	Not clearly visible in the supplied photograph
Quantity in photo	2 units
Condition	Refurbished
Category	Accessories
Supplier	SM MARINE SERVICE™, Chattogram, Bangladesh

Product Introduction

SM MARINE SERVICE™ (https://www.smmarineservice.com/) supplies the Solcon MPR-6 Motor Protection Relay. The MPR-6 is a microprocessor-based digital relay that protects critical three-phase motors by monitoring phase currents, ground current and motor temperature, and by building a thermal model of the motor. It is used on ships for pumps, compressors, fans and winches, and in industrial plants.

What Is This Equipment?

The MPR-6 is mounted on the starter panel door and connected to current transformers, an optional RTD or thermistor in the motor, and the contactor control circuit. It trips the motor on overload, stall, unbalance, earth fault and other faults, and shows operating data and fault history on its LCD.

Main Features

• Microprocessor-based, true RMS measurement with 0.5 ms sampling
• Thermal model with early "time to trip" warning
• Separate alarm and trip levels with adjustable delays
• RTD or PTC/NTC thermistor temperature input
• Programmable inputs, outputs and analogue output
• RS-485 MODBUS communication for remote monitoring and programming
• Statistics: run time, number of starts and trips, last trip data
• Compact panel-mount design

Solcon MPR-6 Motor Protection Relay – front panel

Main Technical Specifications

Power supply	230 VAC (175–250 V) or 115 VAC (88–125 V), 45–65 Hz (per published data)
Measurement	Three-phase current, ground fault current, true RMS
Temperature input	RTD or PTC/NTC thermistor
Communication	RS-485, MODBUS protocol
Analogue output	Programmable
Display	LCD with status LEDs
CT input / relay contact ratings	Not clearly visible in the supplied photograph

Inside the Unit: PCBs, Modules & Part Numbers

Solcon does not publish separate PCB part numbers for the MPR-6. The internal sections are:

Main Microprocessor / Control PCB

Performs true RMS measurement, thermal modelling and all protection logic.

Display & Keypad PCB

LCD, status LEDs and the six-key membrane keypad on the front.

Power Supply Section

230 VAC or 115 VAC control supply input.

Input / Output & Communication Section

CT current inputs, temperature input, external fault inputs, output relays, analogue output and RS-485 port.

Exact internal board numbers: not verified.

Main Components & Related Units

• Current transformers for phase and ground current
• Motor RTD or thermistor sensors
• Related Solcon relays: MPR-3 Motor Protection Relay, TPR-6 Temperature Protection Relay, MIP6 Motor Insulation Protection Relay
• Solcon soft starters (e.g. RVS-DN) used in the same motor starter panels

Marine & Industrial Applications

• Ship pumps: cargo, ballast, fire, cooling water, lube oil
• Compressors, fans, blowers, winches and thrusters
• Medium-size low-voltage motors and small medium-voltage motors
• Process industry, water treatment, mining and power plants

Solcon MPR-6 – LCD display, LEDs and keypad

Common Problems & Troubleshooting

• Display blank: check control supply voltage and fuse.
• Nuisance trips on start: check start time and starting current settings against the motor data.
• Unbalance or ground fault trips: check CT wiring, motor cable insulation and supply phases.
• Temperature sensor fault: check RTD/thermistor wiring – the relay detects a disconnected sensor.
• No communication: check RS-485 polarity, address and baud rate.

Safety note: isolate the motor starter and control supply before work. Short-circuit CT secondaries before disconnecting the relay. Only qualified electricians should change protection settings.

Common Alarms

The relay provides alarm/trip for the documented functions: maximum start time (stall), too many starts, under-current, load increase, over-current (jam), short circuit, thermal capacity, current unbalance, ground fault, current instability (broken bar), over-temperature, disconnected temperature sensor and external faults 1 and 2.

Maintenance Tips

• Record all settings and keep a copy on board.
• Check fault history and statistics regularly.
• Keep the panel dry and terminals tight.
• Test the trip function during planned maintenance.

Spare Parts & Replacement Availability

SM MARINE SERVICE™ can supply the Solcon MPR-6 and related Solcon relays. For a quotation please send a photo of the rear label (model, supply voltage, options), quantity and delivery port. We ship worldwide.

Why This Equipment Is Still Used

The MPR-6 gives complete motor protection in a compact unit. Replacing a failed relay with the same model keeps the panel wiring and settings unchanged.

FAQ

Q: Who makes the MPR-6?
A: Solcon.

Q: What does the MPR-6 protect against?
A: Overload, stall, too many starts, jam, short circuit, unbalance, ground fault, under-current, over-temperature and external faults.

Q: What supply voltage does it use?
A: 230 VAC or 115 VAC versions, depending on order.

Q: Does it support Modbus?
A: Yes, RS-485 MODBUS.

Q: Can it use motor temperature sensors?
A: Yes, RTD or PTC/NTC thermistor.

Q: Are there replaceable PCBs?
A: Solcon does not publish separate PCB numbers; the relay is normally replaced as a complete unit.

Q: What is the difference between MPR-6 and MPR-3?
A: Both are Solcon motor protection relays; please confirm the required functions with us.

Q: How many units are available?
A: Two units are shown; availability subject to confirmation.

Q: What condition are they?
A: Refurbished.

Q: Do you ship worldwide?
A: Yes, SM MARINE SERVICE™ ships worldwide.

Short Product Description

The Solcon MPR-6 Motor Protection Relay is a microprocessor-based digital relay for critical three-phase motors. It measures phase and ground currents in true RMS, builds a thermal model with time-to-trip warning, and accepts RTD or thermistor temperature input. Protection includes stall, too many starts, jam, short circuit, unbalance, ground fault, under-current, broken bar and over-temperature. It offers an LCD display, programmable I/O, analogue output and RS-485 MODBUS. Used for ship pumps, compressors, fans and industrial motors. SM MARINE SERVICE™ supplies refurbished MPR-6 relays with worldwide shipping.

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SM MARINE SERVICE™ – Marine Automation & Navigation Equipment Supplier

Available Equipment Conditions: New • Used • Refurbished • Reconditioned (Specific product condition and availability are subject to confirmation.)

Stock Locations: Bangladesh • China

Services: Worldwide Shipping • Technical Support • Spare Parts Supply • Marine Equipment Sourcing

Samir Market, DT Road, Pahartali, beside CDA Market, Chattogram, Bangladesh

Mobile / WhatsApp / Viber: +88 01818 929292

Email: info@smmarineservice.com

Website: https://www.smmarineservice.com/

Contact SM MARINE SERVICE™ today for a quotation on the Solcon MPR-6 Motor Protection Relay.

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