Honeywell SmartVFD HVAC2 Applications Manual page 160

parameter motor nominal current and the drive's
nominal current IL are used to find the scaling
ratio for the internal torque value. If other than
nominal motor is used with the drive, the
accuracy of the torque calculation decreases.
The default parameter value of the underload
protection time limit is 20 seconds, which is the
maximum time allowed for an underload state to
exist before causing a trip according to this
parameter.
U n d e rlo a d cu rv e a t
Feild weakening point,
P12.14(default)=50%
U n d e rlo ad cu rve a t
ze ro fr e q. P12.15= 10%
Fig. 59. Underload protection
160
To rq ue
U nd e rlo ad a re a
5 H z
Field w ea ke n ing
p oin t , P 1 .1 1
f
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