Hitachi SJ Series, User Manual

Page: 203 / 786

12-7-4
Chapter 12 Inverter Functions
Free electronic thermal characteristics (continued)
(Ex. 4) For output frequency of [bC122]
Change of heat emission characteristics of
electronic thermal
• Want to set heat emission characteristics of the
motor.
• When the current is below the electronic thermal
level, the temperature integration data can be
reduced according to the heat emission from the
motor. ([bC112]=01)
• Constant period mode employed in SJ700 can
also be chosen.
Ex. 1) Subtraction mode (for [bC112]=01,
[bC113]=600 s(10 min.))
• When the output frequency coincides with the first
free-electronic thermal frequency 2 [bC122], the
electronic thermal time-limited characteristics are
given in the lower part of Example 4.
• In Example 4, a trip occurs in 60 s when an electric
current of 150% of the designated first
free-electronic thermal current 2 [bC123] flows
continuously.
・
When [bC121][bC123][bC125] are set as default
(0.00) and [bC111] electronic thermal is set as 02,
E005 is generated.
・
Be sure to set [bC125][bC123] and [bC121] in this
sequence when to set free electronic thermal.
• The electronic thermal of the inverter works
independently even when the electronic thermal
subtraction time is made shorter.
• Appropriate setting should be made for the motor
that you use.
• In case of [bC112]=00, resetting cannot be made
in 10 s after occurrence of an error.
・bC112=00 to be set to be equivalent to SJ700.
Ex. 2) Constant period mode (for [bC112]=00)
*) In the constant period mode, a trip occurs when
either of the duplicated counters reaches 100%. In
the constant period mode, data are cleared with a
constant period of 10 minutes.
Parameters
Item Parameters Data Description
First electronic
thermal subtraction
function selection
[bC112]
00
Constant period mode:
The temperature integration data are cleared with a constant
period of 10 minutes.
01
Subtraction mode:
The temperature integration data are subtracted in
accordance with the heat emission of the motor.
First electronic
thermal subtraction
time
[bC113] 1s~1000s
Should be set in accordance with the heat emission time of
the motor.
Sets the time for the integration data to change form 100% to
0%.
Ｑ
Ａ
Ａ
！
！
Max. frequency (Hz) For IM,
[Hb105] For SM (PMM),
[Hd105]
[bC125]
[bC123]
[bC121]
[bC120]
[bC122]
[bC124]
0
Output current (A)
Trip time (s)
60
3.0
(x) (y) (z) 0
Motor current (A)
(x)
：
[bC123]×110%
(y)
：
[bC123]×150%
(z)
：
[bC123]×200%
Integration
data
Time
100%
0%
10 min.
Integration
data
Time
100%
0%
10 min.
10 min.