116 Rockwell Automation Publication PFLEX-RM003E-EN-E - January 2011
Chapter 1 Detailed Drive Operation
Precharge Staging
Parameter 472 [PreCharge Delay] can be used in conjunction with a precharge
enable (see condition one in Precharge Operation on page 112
) to coordinate the
precharge operation of a group of drives. Typical uses may include common bus
or shared bus applications. The precharge coordination can be open loop, using
different precharge delay times or could be closed loop by monitoring the
precharge done status (parameter 555 [MC Status], bit 11 “PreChrg Done”) of
each drive before the next drive in the sequence is enabled for precharge. The
maximum value for [PreCharge Delay] is limited by parameter 410 [PreChrg
TimeOut]. The maximum value for [PreCharge Delay] is determined by the
following calculation:
• [PreCharge Delay] max = [PreChrg Timeout] - 1
Motor Sim Mode
When motor simulation mode is selected, the precharge requirements are
ignored and the precharge done condition is not required to run the drive.
External Power Supply
If the drive is used with an external power supply, the user should not request
precharge until the drive incoming power is available. If the user does request
precharge without incoming drive power, a precharge timeout fault will occur (if
configured for a fault).
Preset Speeds
There are seven preset speeds available for use. Refer to Speed Reference on
page 145 for more information.
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