Motor Operating States

Introduction

TeSys GV5 / GV6 devices consider the application to be operating as soon as the 10% of Ir pickup is crossed in a positive direction by the motor current.

Two operating states are considered:

Startup state
Steady state

Startup State

The application is considered to be in startup state according to the following criteria:

Start: As soon as 10% of Ir pickup is crossed in a positive direction by the motor current.
End: As soon as Id pickup equals 1.5 x Ir and the td time delay equals 10 s (non-adjustable parameters).

Exceeding the 10 s time delay does not result in tripping.

NOTE: The trip unit filters the subtransient state (first current peak of approximately 20 ms on contactor closing). This current peak is not therefore taken into account when assessing whether the Id pickup has been crossed.

Steady State

The application is considered to be in steady state according to the following criteria:

Start: As soon as startup ends.
End: As soon as the 10% of Ir pickup is crossed in a negative direction by the motor current.

Operating Diagram

The following diagrams show the two cases of transition between startup and steady state:

Operating states with current I < Id before end of td

Operating states with current I > Id at end of td

A TeSys GV5 / GV6 devices status (green: ON position)

B Contactor status (green: ON position)

C Current in the motor

D Operating state: startup state (green: active state)

E Operating state: steady state (green: active state)