Vector Control Iq Limit (Torque Current Limit) - Toshiba T300MV2 Instruction Manual

Medium voltage adjustable speed motor drive
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CIRCUIT OPERATION (cont'd)

Vector Control IQ Limit (Torque current limit)

The IQ limit has a flat characteristic from 0 to base speed and tapers from base to top speed. The
following settings are used to adjust the limits.
LMT_IQ_BAS: Base speed torque current limit. Set 110%, 115%, etc. according to OL
LMT_IQ_TOP: Top speed torque current limit. Set as required by the application or set the same
LMT_IQ_INV:
LMT_SP_BASE: The upper speed of the drive at which LMT_IQ_BASE is used. Set 125% for
LMT_TRQ:
LMT_TRQ_INV: Torque reference regeneration absolute limit. The maximum regeneration torque
Speed feedback
IF08CZ10 April, 2019
specification of the drive.
as the base limit when field weakening is not used.
Regeneration torque current limit. Set to 1 or 2%. This Drive cannot regenerate.
applications that do not use field weakening. Otherwise set as required by the
application.
Torque reference motoring absolute limit. The maximum motoring torque reference
allowed regardless of speed. Set to the base speed torque current limit.
reference allowed regardless of speed. Set to 2%.
IQ limit calculation
LMT_IQ_BAS
LMT_IQ_TOP
LMT_IQ_INV
LMT_SP_BASE
Normal rotation
IQ limit
deceleration
LMT_IQ_BAS
LMT_IQ_INV
LMT_SP_BASE
Inverse rotation
acceleration
- 46 -
IQ limit
IQMAX4
Normal rotation
acceleration
LMT_IQ_TOP
100%
Speed
Magnetic
flux reference
Inverse rotation
FL_R
deceleration
IQ Limit
IQ limit
Torque
limit
X
LMT_TRQ

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