Hitachi WJ Series User Manual page 125

Chapter 8
■ When [b910] = 00

Clears the load factor every 10 minutes. When one
of the doubled counters becomes 100%, inverter
trips due to " Overload error [E05]".
100%
Electronic
thermal load
ratio
0%
■ When [b910] = 02

The electronic thermal load ratio is subtracted at
the rate where the load ratio is from 100% to 0% in
the set time in [b911].
100%
Electronic
thermal load
ratio
0%
Saving the accumulated value of the electronic thermal even after power-off
A
 The accumulated value of the electronic thermal can be saved when the power is turned off, and
can be read the next time the power is turned on.
Code
Store electronic thermal
[b914]
counter at power-off
Related functions
A
 The electronic thermal load ratio can be checked on the "Electronic thermal load ratio monitor
(Motor) [d104]".
 If want to output a warning signal when the electronic thermal load ratio exceeds a certain level,
set the output terminal function "Electronic thermal alarm (Motor) [THM] (13)" and "Electronic
thermal warning level (Motor) [C061]". For details, see "9.11.5 Outputting a Warning before
Electronic Thermal Protection".
Mandatory Setting for Motor Drive and Test Run
10 minutes
10 minutes
Time
Time
[b911]
Item
The accumulated value is set to zero when the power is
turned on.
Stores the accumulated value when the power is turned
off and displays it when the power is turned on.
8-1-12
■ When [b910] = 01

The electronic thermal load ratio is subtracted at
the rate where the load ratio is from 100% to 0% in
10 minutes.
100%
Electronic
thermal load
ratio
0%
■ When [b910] = 03

The electronic thermal load factor when the output
current falls below the electronic thermal level is
subtracted by a first-order filter with the set value of
[b912] as the time constant. The load ratio
becomes 0% in approximately five times of the set
time in [b912].
100%
Electronic
thermal load
ratio
0%
[b912]
Description
10 minutes
Time
Time
[b912] × 5
Data
00
01