Parker AC890 Product Manual page 140

The 4-Q Regen drive can act as a Smart Brake:
4-Q Regen Drive:
 In addition to the settings given in "Drive Set-up", page 7-26, set the BRAKE MODE
parameter in the REGEN CONTROL function block to TRUE.
In this system, the 4-Q Regen drive supplies the regenerating requirement of the load.
Additional external equipment required by the 4-Q Regen drive includes:
 EMC Filter
 AC Line Fuses
 DC Link Fuses
During motoring operation, the drives on the common link are supplied via their own internal 3-phase
diode bridge. The 4-Q Regen drive tracks the mains supply but does not supply motoring power to the
common DC Link.
During regeneration, the DC link voltage will rise and trigger the 4-Q Regen drive to return the excess
power to the mains (sinusoidal current, unity power factor).
Thus, the 4-Q Regen drive acts as a smart, no loss, Dynamic Brake.
The BRAKE MODE allows the level of regeneration (braking) capacity in the system to be rated differently
from the required motoring capacity.
When using the Brake Mode, each drive is responsible for pre-charging its own DC Link. When an
individual drive is pre-charged and healthy, it connects itself on to the common DC Bus via a DC contactor.
The drives disconnect from the common bus if a trip occurs.
890SD (Standalone) Drive: Frame G, H & J
Operating the Drive
MMI Menu Map
1 SETUP
2 MOTOR CONT ROL
3 REGEN CNTROL
BRAKE MODE
6-36
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