DG-IRMCK203 Datasheet, PDF (48/67 Pages) International Rectifier – Application Developer’s Guide

Byte
Offset
7
0x7E
0x7F
IRMCK203 Application Developer’s Guide
Bit Position
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1
0
NumRetries
ParkIRet
StartupRetrial Write Register Map
Field
Name
RetryTm
ParkTmRet
FlxThrL
FlxThrH
NumRetries
ParkIRet
Access Field Description
(R/W)
This parameter provides the adjustment to the sampling instant for
W determination of start failure. The sampling instant starts when
Closed_Loop = 1. Scaling 1 count = 1.966 msec. Please do not
modify this parameter without consulting a motor drive FAE.
During motor start-up, dc current is injected to the motor for
W maximization of startup torque per ampere rating. ParkTm controls
the duration of dc current injection. However, users are able to use a
longer duration after two or more restarts by setting this parameter
(ParkTmRet scaling 255 = 4 secs.). This is done to increase the
chance of a successful start-up.Start-up failure may be caused by
increased shaft friction. After first start-up retry, the parking time can
be increased to improve parking performance.
W The low flux threshold level for determining a successful startup
(scaling: 129 = 100% flux). Please do not modify this parameter
without consulting a motor drive FAE.The low flux threshold level for
determining a successful startup.
W The upper flux threshold level for determining a successful startup
(scaling: 64 = 100% flux). Please do not modify this parameter
without consulting a motor drive FAE.The high flux threshold level for
determining start-up failure.
If start-up fails, the user can program start-up retrial. This parameter
W determines the number of start-up retries. A value of zero will disable
startup retrial. The maximum number of retries is 15.
During motor start-up, dc current is injected to the motor for
W maximization of startup torque per ampere rating. Users are able to
use a higher level of dc current injection (ParkIRet scaling 255 =
Motor Rated Amp * 0.866) after two or more restarts. This is done to
increase the chance of a successful start-up.Start-up failure may be
caused by increased shaft friction. After first start-up retry, the
parking current can be increased to improve parking performance.
StartupRetrial Write Register Field Definitions
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