40
Gemini GV Hardware Installation Guide
the fault and reset itself within 10 seconds (an overtemperature fault may take
longer to clear). When it resets itself, the GPDM will illuminate its green LED; the
GPDM is then again ready to dissipate regenerated energy.
If regeneration continues while the GPDM is in a faulted state, the drive may
experience an overvoltage fault. If you look for the cause of the drive overvoltage
fault, be aware that it may have been caused by a prior GPDM fault—even though
the left LED is now green.
If excessive regeneration continues to cause GPDM faults or drive faults, you can
connect a second GPDM, as shown in the GPDM Connections drawing below.
GPDM Specifications
Activation Conditions:
Turn on: 398VDC
Turn off: 380VDC
Resistance:
Six 100 ohm resistors in parallel (16.7 ohm equivalent)
Continuous Dissipation:
300W in 25
°
C internal ambient
Maximum Dissipation:
9KW
Maximum Pulse Energy:
13KJ (pulse rating of resistors, repeatable, not to
exceed continuous rating)
Weight:
3.1 pounds (1.4 kg)
LED Color Code for GPDM:
Left:
Right:
Status:
Green
Off
ready
Green
Yellow*
active
Red
Off
fault (max. temperature, duty cycle, or pulse exceeded)
*Yellow LED may flash or be continuously illuminated until GPDM stops dissipating
GPDM Connection Instructions
WARNING
Sheet metal and exhaust air at the top of the enclosure are hot. Avoid contact.
WARNING
V BUS+ and V BUS- terminals are at hazardous voltages when power is applied to
the drive, and for up to 30 seconds after power is removed. Lower voltages may
still be present for several minutes after power is removed. Reinstall the clear
plastic terminal cover after you make connections.
WARNING
Only connect V BUS
±
terminals of drives that share the same fused AC power
source, as shown in the next drawing.
Connecting the GPDM
1.
Connect up to three Gemini Servo Drives to one GPDM. (Connect only GV-U3n/
U6n/U12n drives. Do not connect any other Gemini drives to the GPDM.)
2.
Connect drive V BUS+ terminals to V BUS+ on the GPDM
3.
Connect drive V BUS– terminals to V BUS– on the GPDM
4.
For multiple drives, connect drive safety earth terminals to a single point ground.
5.
Keep connections between drive and GPDM less than 12 inches (300 mm). Use 14
AWG (2.5 mm
2
) or greater diameter wire.
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