Schneider TeSys GV5/GV6 Motor Circuit Breaker Operation and Protection Guide

ON Open Close Close Close

Electrical fault tripping, closing, opening, closing

Voltage release/push in test trip closed open open

6.2 Voltage Release Device

MN/UVR undervoltage trip: trips when the voltage is below 0.35 × Ue; When the voltage is between 0.35-0.7Ue, it may trip; When it is higher than 0.7Ue, it will not trip. The restoration voltage needs to reach 0.85Ue before it can be closed again. Commonly used for safety emergency stop.

MX/SHT shunt trip: When the control voltage exceeds 0.7 × Ue, the trip can be triggered by pulse or continuous signal (≥ 20ms).

It is recommended to test the operational reliability of the voltage release every six months.

6.3 SDTAM Thermal Fault Module

This module communicates with the trip unit through an optical link and provides two static outputs:

Output 1 (SD2): Normally open contact, activated when overloaded or severely unbalanced, and remains in state until manually reset or delayed automatic reset.

Output 2 (SD4): A normally closed contact used to control the contactor coil. Open 400ms before tripping, so as to disconnect the contactor first and then release the circuit breaker. This can:

Reduce the stress borne by the motor

Avoid frequent breaking of high current by circuit breakers to extend their lifespan

When the fault is temporarily eliminated (such as when the startup time is too long due to voltage sag), it can be automatically restored without the need for manual resetting of the circuit breaker.

Reset method:

Manual: Set the SDTAM dial to the OFF position, power off and then power on again.

Automatic: Set the dial to the 1-15 minute range and reset automatically after a delay (matching the motor cooling time).

Attention should be paid when wiring: if the power consumption of the contactor coil exceeds 80mA, an intermediate relay must be isolated.

Environmental adaptability and derating

7.1 Temperature and altitude

Operating temperature: -25 ° C to+70 ° C (-35 ° C to -25 ° C can be adjusted but long-term operation is not guaranteed)

Storage temperature: -50 ° C to+85 ° C

Altitude reduction:

Below 2000m: rated voltage 690V, current not reduced

3000m: maximum voltage 690V, current 0.98 × In

4000m: maximum voltage 635V, current 0.96 × In

5000m: maximum voltage 560V, current 0.94 × In

7.2 Vibration and EMC

The equipment has passed the vibration test certified by DNV-GL classification society: amplitude ± 1mm at 2-13.2Hz, acceleration 0.7g at 13.2-100Hz. The electromagnetic compatibility complies with Appendix F and J of IEC/EN 60947-2, and can resist operating overvoltage, lightning, walkie talkie radiation, and electrostatic discharge, avoiding accidental tripping.

Troubleshooting and maintenance recommendations

8.1 Common Problems and Countermeasures

Possible causes and steps for handling the phenomenon

The handle is on Trip, unable to reset downstream short circuit or overload. Check the insulation resistance, motor winding, and cable. Reset after repair

Equipment trips without reason, no SDE signal voltage release misoperation or push in test to check if the control voltage is stable, and if MN/UVR is below 0.7Ue

If the green READY LED does not flash and the load current is below 30A (LED does not work) or if the trip unit is faulty and the load is greater than 30A and the LED is off, the trip unit needs to be replaced

Red ALARM LED always on thermal imaging>95% Ir. Check if the motor has been overloaded for a long time or if there is poor ventilation

Unbalance protection frequently operates, three-phase current deviation>30%. Check for contactor contact fusion welding, power phase loss, and local short circuit in motor winding

8.2 Maintain operational safety

Before conducting any internal inspection, the handle must be placed in O and locked, and a voltage tester must be used to confirm that there is no voltage at the upper and lower ports.

After a short circuit trip, the main contact should be checked for burn damage and the mechanism should be checked for jamming. If necessary, conduct a verification of the breaking ability.

Regularly (annually) use Push to Trip to test the protection function; For the SDTAM module, it should be tested whether its output operates 400ms before overload.