YASKAWA SI-T/ V7, Technical Manual

Page: 41 / 157

2-5
DIGITAL OPERATOR
DESCRIPTION KEY SEQUENCE DISPLAY
Table 2-1. Open Loop Vector Startup Procedure - Continued
Set the motor “no load cur-
rent” in the drive.
Motor no load current is set
as a percentage of motor
rated current. It is calculated
using the formula:
I
noload
*100 = n110
I
rated
Where:
I
noload
= Motor no load current
(measured in the
previous step)
I
rated
= Motor rated current
(from motor
nameplate)
Example:
2.5 * 100 = 60
4.2
Press the key four times.
DSPL
This completes the startup.
Make further programming
changes as required.
Press the key to get out of the pro-
gramming mode.
DSPL
(1)
The number in the display may be different than shown.
(2)
Motor synchronous speed can be calculated using the following formula:
120 x motor rated frequency
synch. speed =
number of motor poles
For 60 Hz Rated Motors
Poles Synchronous Speed
2 3600 RPM
4 1800 RPM
6 1200 RPM
8 900 RPM
PRGM
PRGM
PRGM
PRGM
FREF
Press the key.
DATA
ENTER
Press the key.
Use the & keys until the
number in the display matches calculated no-
load current.
V
V
DATA
ENTER
Press the key four times.
V
(1)
(1)