gefran VDI100 Series Instruction Manual page 321

A larger than required torque compensation gain value creates over-excitation at low speeds, continued operation
may cause the motor to overheat. Check the characteristics of the motor for additional information.
Warning
Toute valeur excessive du gain de compensation du couple entraîne une surexcitation aux basses vitesses. Le
fonctionnement continu peut provoquer une surchauffe du moteur. Pour plus d'informations, vérifier les ca-
ractéristiques du moteur.
Automatic Energy Saving Functions (11-19)
8.4.
In the V/f control mode the automatic energy saving (AES) function automatically adjusts the output voltage
and reduces the output current of the inverter to optimize energy savings based on the load.
The output power changes proportional to the motor load. Energy savings is minimal when the load exceeds
70% of the output power and savings become greater when the load decreases.
The parameter of automatic energy saving function has been set at the factory before shipment. In general, it is
no need to adjust. If the motor characteristic has significant difference from Gefran standard, please refer to the
following commands for adjusting parameters:
Enable Automatic Energy Savings Function
To set parameters 11-19 to 11-24:
After power-up press the DSP/FUN key
-
Set Group 11 (Auxiliary Function Group), and select parameter -19 to -24 with the UP/DOWN ▲ and ▼
-
keys and press the READ/ ENTER key.
(1) To enable automatic energy saving function set 11-19 to 1.
(2) Filter time of automatic energy saving (11-20)
(3) Commissioning parameter of energy saving (11-21 to 11-22)
In AES mode, the optimum voltage value is calculated based on the load power requirement but is also affect-
ed by motor temperature and motor characteristic.
In certain applications the optimum AES voltage needs to be adjusted in order to achieve optimum energy sav-
ings. Use the following AES parameters for manual adjustment:
11-21: Voltage limit value of AES commissioning operation
Sets the voltage upper limit during automatic energy saving. 100% corresponds to 220V or 440V depending on
the inverter class used.
11-22: Adjustment time of automatic energy saving
Set sample time constant for measuring output power.
Reduce the value of 11-22 to increase response when the load changes.
Note: If the value of 11-22 is too low and the load is reduced the motor may become unstable.
11-23: Detection level of automatic energy saving
Set the automatic energy saving output power detection level.
VDI100 • Instruction manual
Voltage limit value of commissioning operation
Voltage Limit
11-21
11-21
Output
Voltage
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