YASKAWA Varispeed V7 Instruction Manual page 177

Energy-saving Search Operation
In energy-saving control mode, the maximum applicable voltage is cal-
culated using the output power. However, a temperature change or the
use of another manufacturer's motor will change the fixed constants,
and the maximum applicable voltage may not be emitted. In the search
operation, change the voltage slightly so that the maximum applicable
voltage can be obtained.
Search Operation Voltage Limit (n144)
Limits the range where the voltage is controlled. The constant is set in
% for 200-V/400-V Inverters. The search operation is not performed
when n144 is set to 0.
Constant No.
n144
Search Operation Voltage Steps (n145, n146)
Constants n145 and n146 set the change in voltage for one cycle of the
search operation. For 200 V Class Inverters, set the values as percent-
ages of 200 V. For 400 V Class Inverters, set the values as percentages
of 400 V. Increase the value and the changes in the rotation speed will
also increase.
For 200 V Class Inverters, the range of the change in voltage is deter-
mined from the 100% and 5% settings for 200 V. For 400 V Class
Inverters, the range of the change in voltage is determined from the
100% and 5% settings for 400 V. The values calculated by linear inter-
polation are used for voltages other than these.
Constant
No.
n145
n146
n143
176
Name
Search Operation Voltage Limit
Name
Search Operation Voltage Step at
100%
Search Operation Voltage Step at
5%
Power Average Time
Unit Setting Range
% 0 to 100
Unit Setting Range
% 0.1 to 10.0
% 0.1 to 10.0
×24 ms
1 to 200
Factory
Setting
0
Factory
Setting
0.5
0.2
1 (24 ms)