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Gemini GT6 Hardware Installation Guide
Protective Circuits
Short Circuit Protection
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:
Phase to phase short circuit
Phase to earth short circuit
Results of Fault:
Power to motor is turned OFF
LEDs: Left = illuminated RED; Right = off
Fault output is activated
Latched fault
Inrush Current Protection
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
Current limiter bypassed
Drive
Limiter (ohms):
with shorting relay:
GT6-L5
5
Ω
yes
GT6-L8
5
Ω
yes
GT6-U5
5
Ω
no
GT6-U8
5
Ω
no
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:
Inrush Current Limit:
25°C (77°F)
less than 35 amps
50°C (122°F)
less than 70 amps
Drive Overtemperature Protection
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:
80°C (176°F)
Results of Fault:
Power to motor is turned OFF
LEDs: Left = illuminated RED; Right = off
Fault output is activated
Latched fault
