Parker Gemini GV6K Series, Руководство по установке оборудования

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Chapter 4 – Special Features
43
Regeneration with GV6K-U3n/U6n/U12n
GV6K-U3n/U6n/U12n drives do not have internal regeneration circuitry. Conse-
quently, they cannot cause a regeneration fault. The drives can absorb the follow-
ing amounts of regenerated energy in their internal capacitors:
Absorb
Drive (joules):
GV6K-U3n 44 J (from 340 – 410VDC: 1680
µ
F)
GV6K-U6n/12n 59 J (from 340 – 410VDC: 2240
µ
F)
If excess regenerated energy causes overvoltage faults, you can connect the
Gemini Power Dissipation Module (GPDM) to the V BUS
±
terminals of these
drives. Regenerated energy from the drive will then be dissipated in the GPDM.
Gemini Power Dissipation Module (GPDM)
NOTE: The GPDM is designed for use with GV6K-U3n/U6n/U12n drives only.
Do not use the GPDM with GV6K-L3n/H20n/H40n drives.
The GPDM dissipates excess regenerated energy in its internal resistors. If
regenerated energy from the motor causes the drive’s DC bus voltage to increase
to 398VDC, the GPDM connects its resistors in shunt across the DC bus. Energy
in the drive’s capacitors is then dissipated as heat in the GPDM’s resistors.
When the DC bus voltage decreases to 380VDC, the GPDM disconnects its
resistors. If the motor continues to regenerate energy and the bus again rises to
398VDC, the process repeats until regeneration stops or a fault occurs.
The GPDM monitors three parameters, and generates a fault if any of the follow-
ing are exceeded:
• maximum duty cycle
• maximum temperature
• maximum energy pulse
If the GPDM faults, it will disconnect itself from the DC bus and illuminate its red
LED. Its internal fan will continue blowing. The GPDM will automatically clear
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.