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74
Gemini GV 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.
Short circuit fault caused by:
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:
GV-L3n
5
Ω
yes
GV-U3n
10
Ω
yes
GV-U6n
10
Ω
yes
GV-U12n
10
Ω
yes
GV-H20n
10
Ω
yes
GV-H40n
20
Ω
yes
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:
Inrush Current Limit:
25
°
C (77
°
F)
less than 35 amps
50
°
C (122
°
F)
less than 70 amps
Drive Overtemperature Protection
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:
All drives except GV-H20n:
80
°
C (176
°
F)
GV-H20n:
90
°
C (194
°
F)
Results of Fault:
Power to motor is turned OFF
LEDs: Left = illuminated RED; Right = off
Fault output is activated
Latched fault
Motor Overtemperature Protection
The Gemini drive has two motor overtemperature circuits:
Hardware Switch:
a thermal switch is embedded in Compumotor motor windings
I
2
t
Thermal Model:
the drive’s internal operating software predicts motor winding
temperature, based on motor parameters.
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