Hitachi SJ Series, User Manual

Page: 204 / 786

12-7-5
Chapter 12 Inverter Functions
Maintaining electronic thermal after power
termination or resetting
• Want to continue the motor protection even after
the power is shut off and the system is restarted.
• The temperature integration data of the motor are
saved even after power termination or inverter trip
resetting. When the motor current increases again
when the power is made on or the system is reset,
the system is restarted with the saved temperature
integration data.
Related functions
• Want to know the integration state of the motor
electronic thermal.
• The integration state can be monitored from
[dA-42] electronic thermal load rate monitor
(motor).
• If you want a warning signal when the electronic
thermal exceeds a certain level, set the output
signal function 026 [THM] and [CE-30] electronic
thermal warning level (motor). For details, see
“12.19.8 Output of warning before thermal
protection of motor.”
• When the data-holding function is used, the
integration data are held even if the inverter is
powered off for a long period of time, and a risk of
occurrence of an error would increase. After it is
powered on, a short-time operation could cause an
error.
• Want to know the integration state of the inverter
electronic thermal.
• The integration state can be monitored from
[dA-43] electronic thermal load rate monitor
(controller).
• If you want a warning signal when the electronic
thermal exceeds a certain level, set the output
signal function 027 [THC] and [CE-31] electronic
thermal warning level (controller). For details, see
“12.19.9 Output of warning before thermal
protection of inverter.”
Item Parameters Data Description
First electronic
thermal data
holding selection
[bC-14]
00
Not holding:
The temperature integration data are cleared by the power
shut-off and resetting.
01
Holding:
The temperature integration data are not cleared and
subtracted only in the subtraction mode.
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