Protective Circuits - Parker GT Series Hardware Installation Manual

Protective Circuits

Short Circuit Protection
Inrush Current Protection
Drive Overtemperature Protection
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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):
GT-L5 5Ω
GT-L8 5Ω
GT-U5 5Ω
GT-U8 5Ω
GT-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
Appendix A – Specifications
61