Iq Limit (Torque Current Limit) - Toshiba T300MVi MEDIUM VOLTAGE Instruction Manual

CIRCUIT OPERATION (cont'd)

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 specification of the drive.
LMT_IQ_TOP: Top speed torque current limit. Set as required by the application
or set the same as the base limit when field weakening is not used.
LMT_IQ_INV:
cannot regenerate.
LMT_SP_BASE: The upper speed of the drive at which LMT_IQ_BASE is used.
Set 125% for applications that do not use field weakening. Otherwise set as
required by the application.
LMT_TRQ:
torque reference allowed regardless of speed. Set to the base speed torque
current limit.
LMT_TRQ_INV: Torque reference regeneration absolute limit. The maximum
regeneration torque reference allowed regardless of speed. Set to 2%.
Speed
feedback
LMT_IQ_TOP
IQ Limit
Regeneration torque current limit. Set to 1 or 2%. This Drive
Torque reference motoring absolute limit. The maximum motoring
IQ limit
calculation
LMT_IQ_BAS
LMT_IQ_TOP
_IQ_INV
LMT
LMT_SP_BASE
+IQ
LMT_IQ_BAS
LMT_SP_BASE
LMT_IQ_INV
LMT_IQ_INV
-100%
LMT_SP_INV
SPEED
LMT_IQ_BAS
-IQ
ID limit
calculation
LMT_IQ_TOP
+100%
Flux
SPEED
reference
- 38
IQ imit
l
ID
limit
Torque
reference
limit