Current Limitation Source; Digital Setting Of Current Limit Value; Current Limit Coeff On Flux Weakening; Energy Saving Percentage - Emotron VSB Series Instruction Manual

Emotron VSB Instruction Manual
d1-12

Current limitation source

0: Disabled
1: Set by d1-13
2: Set by AI
When a non-zero value is set by d1-12, the current limitation is enabled. When output
current rises dramatically because of sharp change of load, instant adjustment of output
frequency will keep the output frequency below the set limitation. When the load is reduced,
output frequency will recover promptly. If the setting speed or motor load change dramatically,
this function can effectively reduce over-current fault.
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
d1-13
When d1-12 is set to "1: set by d1-13", 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
d1-14
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.
d1-15

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%.
limit value
weakening
Chapter 6 Specification of Parameters
Range: 0 - 2
Range: 20.0% - 200.0%
Range: 0.001 - 1.000
Range: 0% - 40.0%
- 119 -
Factory default: 1
Factory default:
160.0%
Factory default:
0.500
Factory default:
0.0%