Yaskawa VS-626 MC5 - Manual (Page 144)

Advanced Operation
7.1.3 Setting/Adjusting Motor Constants
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Frequency ( Hz )
Output voltage ( V )
VMAX
( E1-05 )
VC
(E1-08)
VMIN
( E1-10 )
FMIN
( E1-09 )
FB
( E1-07 )
FA
( E1-06 )
FMAX
( E1-04 )
VBASE
( E1-13 )
Fig
7.3 User-defined V/f Pattern
Adjusting Output Voltage: VC (E1-08), VMIN (E1-10)
Adjust the output voltage when you want to output more torque at low speed, such as in an elevator, or
when torque isn’t really necessary and you want to reduce the output voltage to save energy.
Adjustment range:
200 V class Inverters: Initial value 0 to 2 V
400 V class Inverters: Initial value 0 to 4 V
D When generating more torque, gradually increase the voltage but do not exceed 100% of the motor’s
rated current.
D When saving energy, decrease the voltage but do not cause stalling.
Setting the Maximum Output Frequency
The maximum output frequency can be set from 40.0 to 400.0 Hz. Set this constant in accordance with
the motor’s maximum rotational speed.
J Setting Motor Constants: E2-01 through E2-03 (E5-01 through E5-03), E2-05
through E2-08 (E5-05, E5-06)
D The motor constants (function E2) will all be set automatically when autotuning is performed, so it
normally isn’t necessary to set them manually. Set these constants manually if autotuning can’t be
completed properly.
D User constant numbers for motor 2 are given in parentheses.
Motor Rated Current: E2-01
User
Change
during Setting Factory
Valid Access Levels User
Constant
Number
Name
during
Opera-
tion
Setting
Range Unit
Factory
Setting Open Loop
Vector
Flux Vector
E2-01
(E5-01)
Motor rated current 0.32 to 6.40 A 1.90 Q Q
D The setting range is 10% to 200% of the Inverter rated output current. The default setting depends upon
the Inverter capacity. (The table shows the default setting for 200 V class, 0.4 kW Inverters.) (See page
NO TAG.)
D Set the rated current (A) shown on the motor nameplate.
Motor Rated Slip: E2-02
User
Change
during Setting Factory
Valid Access Levels
User
Constant
Number
Name
during
Opera-
tion
Setting
Range
Unit
Factory
Setting Open Loop
Vector
Flux Vector
E2-02
(E5-02)
Motor rated slip
0.00 to
20.00
Hz 2.90 Q Q
D The default setting depends upon the Inverter capacity.
(The table shows the default settings for 200 V class, 0.4 kW Inverters.)
D Calculate the rated slip (E2-02) from the value shown on the motor nameplate with the following equa-
tion and set this value.
Rated slip = rated frequency (Hz) -- rated speed (r/min)
u number of poles/120
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