174
Selecting Cooling Fan Operation
In order to increase the life of the cooling fan, the fan can be set to operate only when Inverter is running n039 = 0 (Factory setting): Operates only when Inverter is running
(Continues operation for 1 minute after
Inverter is stopped.)
=1: Operates with power ON
Using Energy-saving Control Mode
Verify that the constant n002 is set to 0 (V/f control mode) when performing energy-saving control. Set n139 to 1 to enable the energy-saving control function.
Energy-saving Control Selection (n139)
Constant
No.
Name Unit Setting Range Factory
Setting n139 Energy-saving Control
Selection
0: Disabled
1: Enabled
0
Normally it is not necessary to change this setting. However, if the motor characteristics are different from a Yaskawa standard motor, refer to the description below and change the constant setting accordingly.
Energy-saving Control Mode (n140, n158)
The voltage for the best motor efficiency is calculated when operating in energy-saving control mode. The calculated voltage is used as the output voltage reference. The factory setting is set to the max. applicable motor capacity for a Yaskawa standard motor.
The greater the enegy-saving coefficient is, the greater the output voltage becomes.
When using a motor other than a Yaskawa standard motor, set the motor code corresponding to the voltage and capacity in n158. Then, change the setting of the energy-saving coefficient K2 (n140) by 5% to minimize the output power.
When the motor code is set in n158, the energy-saving coefficient K2, which corresponds to the motor code, must be set in n140.
7. Programming Features
Constant
No.
n140
Name Unit Setting Range Factory
Setting
0.0 to 6550 * Energy-saving Control
Coefficient K2
n158 Motor Code
* Depends on Inverter capacity.
0 to 70 *
Energy-saving Voltage Lower/Upper Limits (n141, n142, n159, n160)
Set the upper and lower limits of the output voltage. When the value calculated in the energy-saving control mode is larger than the upper limit (or smaller than the lower limit), the limit value is output as the voltage reference. The upper limit is set to prevent over-excitation, and the lower limit is set to prevent stalls when the load is light. The voltage limit is set for machines using 6 or 60 Hz. For any value other than 6 or
60 Hz, set the voltage limit using linear interpolation. The constants are set in % for 200-V/400-V Inverters.
Constant No.
n141
Name Unit
%
Setting Range
0 to 120
Factory
Setting
50 n142 n159 n160
Energy-saving Control Voltage
Lower Limit at 60 Hz
Energy-saving Control Voltage
Lower Limit at 6 Hz
Upper Voltage Limit For Energysaving Control at 60 Hz
Upper Voltage Limit For Energysaving Control at 6 Hz
%
%
%
0 to 25
0 to 120
0 to 25
12
120
16
Voltage limit
250 V*
Upper limit
Lower limit
6 Hz 60 Hz
* Doubled for the 400 V Class Inverters.
Output frequency
175
176
Energy-saving Search Operation
In energy-saving control mode, the maximum applicable voltage is calculated 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.
Name Unit Setting Range Factory
Setting
0 n144 Search Operation Voltage Limit % 0 to 100
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 percentages 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 determined 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 interpolation are used for voltages other than these.
Constant
No.
n145 n146 n143
Name Unit
Search Operation Voltage Step at
100%
Search Operation Voltage Step at
5%
Power Average Time
%
%
×24 ms
Setting Range
0.1 to 10.0
0.1 to 10.0
1 to 200
Factory
Setting
0.5
0.2
1 (24 ms)
7. Programming Features
Voltage fluctuation
Output voltage
Search Operation Power Detection Hold Width (n161)
When the power fluctuation is less than this value, the output voltage is held for 3 seconds, and then, the search operating mode is started. Set the hold width as a percentage of the power that is currently held.
Constant
No.
n161
Name Unit Setting
Range
0 to 100 Search Operation
Power Detection Hold
Width
%
Time Constant of Power Detection Filter (n162)
Response at load changes is improved when this value is small.
At low frequency, however, unstable rotation will result.
Factory
Setting
10
Constant
No.
n162
Name
Time Constant of Power
Detection Filter
Unit
×4 ms
Setting
Range
0 to 255
Factory
Setting
5
(20 ms)
177
178
Motor Code
The Energy-saving Coefficient K2 (n140) is set to a value that corresponds to the Motor Code (n158).
Motor Type Voltage Class Capacity Motor Code: n158
Yaskawa
General-purpose Motor
200 V
400 V
23
24
25
26
9
10
21
22
27
29
30
3
4
5
7
0
1
2
5.5 kW
7.5 kW
0.2 kW
0.4 kW
0.75 kW
1.5 kW
2.2 kW
3.0 kW
0.1 kW
0.2 kW
0.4 kW
0.75 kW
1.5 kW
2.2 kW
3.7 kW
3.7 kW
5.5 kW
7.5 kW
94.8
72.7
713.8
576.4
447.4
338.8
313.6
245.8
Energy-saving
Coefficient K2: n140
481.7
356.9
288.2
223.7
169.4
156.8
122.9
245.8
189.5
145.4
