gefran VDI100 Series Instruction Manual page 139

Set the motor rpm according to the motor nameplate.
(7) No-load motor voltage (02-19)
Parameter determines the rated flux during motor's rated rotation in SLV or SV control mode. Set the value
of this parameter to the same value as parameter 17-08. A value of 10~50V below the input voltage level
ensures that the motor is capable of providing adequate torque performance when operating at nominal
speed (or higher speed). Setting the value to small can result in a reduction in no-load current, weakened
motor flux and an increase in motor current while the motor is loaded.
(8) Motor excitation current (02-09)
The current is obtained from rotational auto-tuning. It is required to perform manual tuning if the inverter
cannot rotational auto-tune.
When the manual tuning is performed, tune it from 33% and observe no-load voltage (the output value) of
parameter 12-67. If parameter 12-67 is higher than no-load voltage (the setting value) of parameter 17-08,
perform downward revision in parameter 02-09; if it is lower than that, perform upward revision in parameter
02-09.
Tuning motor excitation current of parameter 02-09 will change motor leakage inductance of parameter 02-
17 and motor mutual inductance of parameter 02-18.
It is required to refer to the actual no-load voltage of parameter 12-76 to tune the motor excitation current of
parameter 02-09. Change of the excitation current will also affect the relative actual no-load voltage fluctua-
tion so it is required to tune to the similar setting value of no-load voltage (17-08). 1
(9) Setting of motor core's saturation coefficient 1, 2 and 3 (02-10, 02-11, 02-12)
These parameters are automatically set during auto-tune. No adjustment required. Parameters are set to
50% for 02-10, 75% for 02-11 and 137.5% for 02-12 to reduce the impact of core saturation. The motor
core's saturation coefficient is defined as a percentage of the motor excitation current. When the motor flux
reaches 137.5% level, the core's saturation coefficient shall be greater than 137.5%. When the motor flux is
50% or 75%, the core's saturation coefficient is required to be less than 50% and 75%.
(10) Motor core loss (02-13)
Set motor core loss as the percentage of the motor rated power.
% Wcore ( 02-13) =
Note:
In V/f mode motor core loss (o2-13) is used to for torque compensation.
(11) Motor line to line resistance (02-15)
(12) Motor no-load current (02-00).
Value is calculated based on the motor rated frequency (17-05) and motor rated current (17-03).
In V / F control mode, the output current is greater than the no-load current with slip compensation is ena-
bled.
Note:
The value of 02-01 needs to be greater than the value set in parameter 02-00, otherwise warning message "SE01" out
of range error will be displayed.
VDI100 • Instruction manual
Im : 02-09 Excitation Current
Ks1: 02-10 Motor Core Saturation Coefficients 1
Ks2: 02-11 Motor Core Saturation Coefficients 2 Ks3: 02-12 Motor
Core Saturation Coefficients 3
3 × Motor core loss (watt)
Motor rated power (watts, 02-05)
× 100%
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