Protective Circuits - Parker GT6-L8-NK Hardware Installation Manual

Protective Circuits

Short Circuit Protection
Inrush Current Protection
Drive Overtemperature Protection
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Gemini GT6 Hardware Installation Guide
The Gemini drive has an internal circuit that protects it from short circuits between
one motor terminal to another (phase to phase), or from any motor terminal to
earth. A short circuit fault is a latched fault.
Causes of Fault:
Results of Fault:
The Gemini drive has internal circuitry that protects it from high inrush current
when power is initially applied to the drive. The circuitry works automatically.
Inrush Current
Drive Limiter (ohms):
GT6-L5 5Ω
GT6-L8 5Ω
GT6-U5 5Ω
GT6-U8 5Ω
GT6-L5/8 drives have a shorting relay that removes the inrush current limiter after
drive startup. This allows maximum bus voltage in high acceleration/peak torque/
maximum speed applications.
Operation is temperature dependent:
Ambient Temperature:
25°C (77°F)
50°C (122°F)
The drive overtemperature circuit monitors the drive's internal temperature
sensors. If the sensors exceed the threshold temperature, the drive issues an
overtemperature fault.
Threshold Temperature:
Results of Fault:
Phase to phase short circuit
Phase to earth short circuit
Power to motor is turned OFF
LEDs: Left = illuminated RED; Right = off
Fault output is activated
Latched fault
Current limiter bypassed
with shorting relay:
yes
yes
no
no
Inrush Current Limit:
less than 35 amps
less than 70 amps
80°C (176°F)
Power to motor is turned OFF
LEDs: Left = illuminated RED; Right = off
Fault output is activated
Latched fault