Protective Circuits - Parker Gemini GV Series Installation Manual

Protective Circuits

Short Circuit Protection
Inrush Current Protection
Drive Overtemperature Protection
Motor Overtemperature Protection
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Gemini GV Hardware Installation Guide
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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.
Short circuit fault caused by:
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):
GV-L3n 5Ω
GV-U3n 10Ω
GV-U6n 10Ω
GV-U12n 10Ω
GV-H20n 10Ω
GV-H40n 20Ω
The shorting relay removes the inrush current limiter after drive startup. This
allows maximum bus voltage during high acceleration/peak torque/maximum
speed applications.
Inrush current is temperature dependent:
Ambient Temperature:
25°C (77°F)
50°C (122°F)
The Gemini drive's overtemperature circuit monitors the drive's internal tempera-
ture sensors. If the sensors exceed the threshold temperature, the drive issues an
overtemperature fault.
Threshold Temperature:
Results of Fault:
The Gemini drive has two motor overtemperature circuits:
Hardware Switch: a thermal switch is embedded in Compumotor motor windings
2 t Thermal Model: the drive's internal operating software predicts motor winding
I
temperature, based on motor parameters.
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
yes
yes
yes
yes
Inrush Current Limit:
less than 35 amps
less than 70 amps
All drives except GV-H20n: 80°C (176°F)
GV-H20n: 90°C (194°F)
Power to motor is turned OFF
LEDs: Left = illuminated RED; Right = off
Fault output is activated
Latched fault