Delta VFD11AMS21AFSHA, User Manual

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Chapter 12 Description of Parameter Settings

MS300 (High Speed Model)
12-07-3

Setting 2: Frequency tracking starts from the minimum output frequency, accelerating to master
frequency command after the drive output frequency and motor rotator speed is synchronous.
This setting is recommended if the characteristics of motor load are small inertia and large
resistance.

Allowed Power Loss Duration
Factory Setting: 2.0
Settings 0.0~20.0 sec.

This parameter determines the maximum time of allowable power loss. If the duration of a power
loss exceeds this parameter setting, the AC motor drive will stop outputting.

Pr. 07-06 is valid when the maximum allowable power loss time is

20 seconds and the AC
motor drive displays “LU”. But if the AC motor drive is powered off due to overload, even if the
maximum allowable power loss time is

20 seconds, the operation mode as set in Pr. 07-06 is
not executed. In that case it

Base Block Time
Factory Setting: 0.5
Settings 0.1~5.0 sec.

When momentary power loss is detected, the AC motor drive will block its output and then wait
for a specified period of time (determined by Pr. 07-08, called Base-Block Time) before resuming
operation. This parameter should be set at the time which allows the residual voltage at output
side to decrease to 0V before the drive is activated again.
Ti me
B .B . S p e e d tr a cki n g : fr o m l a st o u tp u t fr e q u e n cy
B.B.
A
In p u t B .B . si g n a l
S to p o u tp u t vo l ta g e
Di sa b l e B .B . si g n a l
Wa i ti n g ti me P r. 0 7 - 0 8
S p e e d tr a cki n g
S yn ch r o n o u s sp e e d d e te cti o n
Fr e q u e n cy co mma n d b e fo r e B .B .
O u tp u t fr e q u e n cy ( H)
O u tp u t vo l ta g e ( V )
O u tp u t cu r r e n t
P r. 0 7 - 0 9
Cu r r e n t l e ve l o f
sp e e d tr a cki n g
FWD Ru n