SPEECON 7300PA series, Instruction Manual, Page: 63 / 139

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(33) Energy-saving tuning operation (Cn-49 to Cn-52)
In the energy-saving mode (Sn-09 = X1XX) the optimum voltage is calculated
according to load power and the voltage is supplied to the load. However, since the
setting motor constants are different depending on temperature variation or use of
other manufactures’-motors, the optimum voltage is not always output. At tuning
operation, operation is controlled so that the optimum operating status can be
obtained by fine adjustment of voltage.
(a) Tuning Operation voltage Limit (Cn-49)
Limits the range where voltage is controlled by tuning operation. Setting is made
in the units of % of rated voltage. By setting this value to 0, tuning operation is
not performed.
(b) Tuning Operation Control Cycle (Cn-50)
Sets the control cycle of tuning operation.
(c) Tuning Operation voltage Step (Cn-51, 52)
Sets voltage variation width of one tuning operation cycle. Setting is made in the
units of % of rated voltage. By increasing this value, rotation speed variation
becomes larger. This voltage variation width is set at tuning stanting voltage
100% and 5%. With the other voltage value, voltage variation width obtained by
linear interpolation is set.
(34) Energy-saving coefficient K2 (Cn-58)
Voltage at which the motor efficient will be the maximum is calculated by using this
coefficient at operation in the energy-saving mode, and the calculated value is to be
voltage reference. This value is already set to the value of a TECO motor as the
initial value. By increasing the energy-saving coefficient, output voltage becomes
larger.
V
HOLD
Cn-49
-Cn-49
5%
Cn-51
Cn-52
100%
Output Voltage
Voltage
Variation
Width