Parker 890SD - Page 177

Operating the Drive
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames B, C & D Page 7-33
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Additional external equipment required by the 4-Q Regen drive includes :
• EMC Filter
• AC Line Fuses
• DC Link Fuses
No extra hardware is required to detect the rotation, frequency and phase of the mains supply. Also, no
dynamic braking resistor is required.
When mains power is applied to the 4-Q Regen drive, the DC link slowly charges through the external pre-
charge circuit and the drive's internal power supply will start in the normal way. If the 4-Q Regen drive is
healthy and the Run signal is applied, it will synchronise to the mains supply (phase, rotation and
frequency). This process takes approximately 100ms. After synchronisation, the DC link on the common
bus is boosted to approximately 720V (on a 400V product). This high value of DC link volts is required for
successful regen operation.