Best E5 Series User Manual page 135

E5 User Manual
When current limitation is enabled, the output frequency at constant speed may change at
times and the Accel/Decel time may probably be automatically prolonged. Therefore, this
function should not be used where output frequency or Accel/Decel time is not allowed to
change.
Digital setting of current
P31.13
When P31.12 is set to "1: set by P31.13", the drive keeps output current less than this current
limit value through instantaneous adjustment of output frequency. 100% current limit value
corresponds to rated current of the drive. If this parameter value is set to a relatively big one, it
will increase the chances of over-current. If this parameter value is set to a relatively small one,
it will affect the loaded capability of the drive.
Current limit coeff on flux
P31.14
When the drive runs at the frequency higher than rated frequency of motor, Accel/Decel
characteristic and output torque can be effectively improved by setting this parameter
appropriately.
P31.15 Energy saving percentage
During no-load or light-load application, load current is detected so as to appropriately reduce
output voltage, reducing the copper loss and iron loss of motor with the purpose of energy
saving. The larger the energy-saving percentage is, the better the energy-saving effect will be,
but the response will be slower. This parameter is applicable to loads such as fan and pump or
light-load for a long time. Where rapid change is required, this parameter is suggested to be
default set 0.0%.
V/f oscillation suppression
P31.16
V/f oscillation suppression
P31.17
Under V/f control, speed and current oscillation is likely to occur due to load vibration, and may
lead to system failure even over current protection. This is particularly obvious during no-load
or light-load applications. The appropriate setting of parameter values of P31.16 and P31.17
would effectively suppress speed and current oscillation. In many case it is not necessary to
modify the default setting. Please make progressive change around default setting, since
excessive setting will influence V/f control performance.
Voltage setting on V/f
P31.18
separated pattern
limit value
weakening
gain 1
gain 2
Chapter 5 Specification of Parameters
Range: 20.0%~200.0%
Range: 0.001~1.000
Range: 0%~40.0%
Range: 0~3000
Range: 0~3000
Range: 0~5
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Factory default:
160.0%
Factory default:
0.500
Factory default:
0.0%
Factory default:
16
Factory default:
20
Factory default: 0