Hitachi SJ Series User Manual page 154

Chapter 12
12.2 Basic setting of inverter
12.2.1 Change duty rating of inverter
Ｑ
• Want to change the duty rating mode to the one
checked in selecting the mode.
• Want to lower the capacity of the inverter against
the motor since the duty of the fan or pump is
small.
• Want to use the inverter for a lift or others with a
heavy duty.
Ａ
• The duty rating mode of the inverter can be chosen
from Normal Duty (ND), Low Duty (LD), and Very
Low Duty (VLD). See "Difference in duty rating
modes" in the following.
• The rated current, excess duty endurance, and
rated temperature of the inverter could change
depending on the duty rating mode.
• A change of the inverter duty rating mode is
reflected immediately after the duty type [Ub-03] is
changed.
Parameters
Item Parameters
Duty Type [Ub-03]
Difference in duty rating modes
Duty rating
Excess duty
150% (1 min.) 200% (3 sec.)
endurance
Temperature 50 °C (with derating)
characteristics
Correspondin Induction motor IM
g control type • V/f control
*) • V/f control with sensor
• SLV (sensorless vector)
control
• 0 Hz-range SLV control
• Vector control with sensor
Synchronous motor SM
• SLV control
Major Lifts, cranes, etc.
applications
*) Feedback option of the optional cassette is
necessary for the vector control with sensor.
Data
00
01
02
ND (Normal Duty)
Conveyors, transportation machines, etc.
！
• When [Ub-03] is changed, the parameter set for
the electric current is automatically adjusted at the
ratio of the changed rated current and the set
value is changed accordingly.
• Another check is necessary if the electric current is
set by using the excess duty limit function, direct
current control function, electronic thermal function,
excess duty warning function, or low current
detection function.
• When VLD is selected and the control mode is
selected out of the VLD specification range with
the control type [AA121], the control mode is
automatically set to the V/f control. Another check
is necessary when the control type setting is
changed.
VLD (Very Low Duty)
LD (Low Duty)
ND (Normal Duty)
LD (Low Duty)
120% (1 min.) 150% (3 sec.)
45°C (with derating)
Induction motor IM
• V/f control
• V/f control with sensor
• SLV (sensorless vector)
control
Synchronous motor SM
• SLV control
12-2-1
Inverter Functions
Description
VLD (Very Low Duty)
110% (1 min.) 120% (3 sec.)
40°C (with derating)
Induction motor IM
• V/f control
• V/f control with sensor
• SLV (sensorless vector)
control
Synchronous motor SM
• SLV control
Fans, pumps