Changing The Load Rating Of The Inverter - Hitachi WJ Series User Manual

Chapter 8
8.1.2

Changing the Load Rating of the Inverter

 How to change to the load rating mode considered at the time of inverter selection?
Q
 How to use the lower capacity inverter against the motor for light load applications such as fans
and pumps?
 The load rating mode of the inverter can be selected from the normal duty rating (ND) and the
A
low duty rating (LD).
 The rated current, overload current rating, temperature rating, etc. of the inverter differ
depending on the load rating mode. Select either one according to the load used.
■ Features of normal duty/low duty rating
Item
Features
Application example
Rated output current
(example)
Overload current rating
 The load rating mode is set in "Load type selection [b049]." Changing the [b049] and pressing
!
the SET key will immediately change the mode. As shown in the table below, the setting range
and the initial value of some parameters will be changed. Note that the setting values at that
time will also be initialized or changed.
Code
[b049] Load type selection
■ List of parameters changed when switching to normal duty rating
Code
*1
[A044] Control mode selection
[A054] DC braking force
[A057] DC braking force at start
[b012] *1 Electronic thermal level
[b016]/
Free electronic thermal
[b018]/
current-1 to 3
[b020]
Overload restriction 1
[b022] *1
active level
Overload restriction 2
[b025]
active level
Active frequency
[b028]
matching restart level
[b083] Carrier frequency
[Ao2] Output reference
[C030] value (at digital output
current monitor)
[C039] Low current detection level
*1
[C041] Overload warning level
[C111] Overload warning level 2
*1
[H003] Async. Motor capacity
*1. "2nd-motor control [SET]" target parameter.
Mandatory Setting for Motor Drive and Test Run
Normal duty rating
Suitable for loads requiring high
torque at start,
acceleration/deceleration, etc.
Elevators, cranes, conveyors, etc.
3.0 A (3-phase 200 V, 0.4 kW inverter)
150%/1 minute, 200%/3 seconds
Item
Normal duty rating (ND mode)
Low duty rating (LD mode)
Item
00(V/f constant torque)/
01(V/f reduction torque)/
02(Free-V/f)/
03(sensorless vector)
0 to 100 (%)
(0.20 to 1.00)
rated current (A)
(0.00 to 1.00)
rated current (A)
(0.20 to 2.00)
rated current (A)
2.0 to 15.0 (kHz)
(0.20 to 2.00)
rated current (A)
0.00: Function disabled
(0.01 to 2.00)
rated current (A)
0.1 to 18.5 (kW)
8-1-2
Suitable for loads with less drive than
rated torque, etc. One size bigger
motor may be able to be driven.
Fans, pumps, air conditioners, etc.
3.5 A (3-phase 200 V, 0.4 kW
inverter)
120%/1 minute, 150%/0.5 seconds
Description
Default value after
Data
initialization
00
50 (%)
0 (%)
×
ND
ND rated current (A)
×
ND
0.00 (A)
×
1.5 ND rated
× current (A)
ND
ND rated current (A)
2.0 (kHz) [Pattern 0]
10.0 (kHz) [Pattern 1]
2.0 (kHz) [Pattern 3]
×
ND
ND rated current (A)
×
1.15
×
ND
current (A)
Same capacity as the
model
Low duty rating
Data
00
01
Setting at
switching to ND
No change
Converted
value
Converted
value
Converted
value
No change
Converted
value
ND rated
No change