Energy Savings Mode / Optional Accel/Decel - Hitachi WJ200 Series Instruction Manual

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Energy Savings Mode / Optional Accel/Decel

Energy Saving Mode – This function allows the inverter to deliver the minimum power
necessary to maintain speed at any given frequency. This works best when driving
variable torque characteristic loads such as fans and pumps. Parameter A085=01
enables this function and A086 controls the degrees of its effect. A setting of 0.0 yields
slow response but high accuracy, while a setting of 100 will yield a fast response with
lower accuracy.
Func.
Code
Energy-saving operation
A085
mode
Energy-saving mode tuning
A086
The acceleration time is controlled so that the output current below the level set by the
Overload Restriction Function if enabled (Parameters b021, b022, and b023). If Overload
Restriction is not enabled, then the current limit used is 150% of the inverter's rated
output current.
The deceleration time is controlled so that the output current is maintained below 150%
of the inverter's rated current, and the DC bus voltage is maintained below the OV Trip
level (400V or 800V).
NOTE: If the load exceeds the rating of the inverter, the acceleration time may be increased.
NOTE: If using a motor with a capacity that is one size smaller than the inverter rating,
enable the Overload Restriction function (
( ) to 1.5 times the motor nameplate current.
b022
NOTE: Be aware that the acceleration and deceleration times will vary, depending on the
actual load conditions during each individual operation of the inverter.
NOTE: When analog input is a source of frequency command, be sure to set analog filter
= (500ms). Otherwise, there can be the case that this energy saving function doesn't
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work well.
"A" Function
Name
Two option codes:
00...Normal operation
01...Energy-saving operation
Range is 0.0 to 100 %.
Description
b021 ) and set the Overload Restriction Level
Run Defaults
Mode
Lnitial data Units
Edit
00
50.0 %
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