Trip Unit Description
Introduction
The trip unit is suitable for protecting motor-feeders in standard applications.
The thermal trip curves are calculated for self-ventilated motors.
The adjustment dials and indications are located on the front face.
Description
TeSys GV5 trip unit
TeSys GV6 trip unit
A Indication LEDs
B Phase-unbalance
C Seal for setting cover
D Setting range
E Instantaneous protection pickup (Ii)
F Tripping curve
G Adjustment dial for the short-time protection pickup (Isd)
H Trip class setting
I Adjustment dial for the overload or thermal protection pickup (Ir)
Indication LEDs
Indication LEDs on the front of the trip unit indicate its operational state.
|
Indication LED |
Description |
|---|---|
|
Green READY LED |
Blinks slowly when the electronic trip unit is ready to provide protection. |
|
Red ALARM LED |
Overload temperature alarm LED: Shows a steady light when the thermal image of the motor exceeds 95% of the Ir setting. |
The indication LEDs function for device load currents above 30 A.
Protection Functions
|
Item |
Parameter |
Description |
Adjustable |
Default setting |
SDTAM activation |
|---|---|---|---|---|---|
|
A |
Ir |
Overload or thermal protection pickup |
Yes |
0.4 x In |
Yes |
|
B |
Class |
Trip class |
Yes |
10 |
Yes |
|
C |
Isd |
Short-time protection pickup |
Yes |
13 x Ir |
No |
|
D |
tsd |
Short-time protection time delay |
No |
0.1 s |
No |
|
E |
Ii |
Instantaneous protection pickup |
No |
17 x In |
No |
|
– |
Iunbal |
Phase-unbalance protection pickup |
No |
30% |
Yes |
|
– |
tunbal |
Phase-unbalance protection time delay during startup |
No |
0.7 s |
Yes |
|
Phase-unbalance protection time delay in steady state |
No |
4 s |
Yes |
Each function is reviewed in detail on the following pages.
Setting the Protection
Set the overload or thermal protection pickup (Ir), the short-time protection pickup (Isd), and trip class (Class) by using the dials on the device.
Reflex Tripping
The system of reflex protection breaks very high fault currents by mechanically tripping the device with a piston actuated directly by the pressure produced in the device from a short-circuit. This piston operates the opening mechanism, resulting in ultra-fast device tripping.