Hitachi WJ Series

Chapter 9 Inverter Functions
9-11-5
9.11.5 Outputting a Warning before Electronic Thermal Protection
 How to monitor the output current of the motor and output a signal before the electronic
thermal error?
 How to cool down the system before a thermal error occurs?
 Assigning "Electronic thermal alarm (Motor) [THM] (13)" to one of the output terminal functions
([C021]/[C022]/[C026]) enables the inverter to output an electronic thermal warning signal.
 The status can be notified by a signal before an "Overload error [E05]" is issued by the electronic
thermal function.
 When the electronic thermal integrated value reaches 100.0%, an "Overload error [E05]" occurs.
 For details on electronic thermal settings, see "8.1.4 Setting the Electronic Thermal for the
Motor".
Code
Item
Description
Data
[d104]
Electronic thermal load
ratio monitor (Motor)
Monitors the electronic thermal load ratio. When
the monitored value reaches 100.0%, an
"Overload error [E05]" occurs.
0.0 to 100.0 (%)
[C061]
Electronic thermal
warning level (Motor)
Sets the overload level which turns on the
"Electronic thermal alarm (Motor) [THM]".
When this is set to 0, it will not function.
0 (Disabled)/
1 to 100 (%)
[C021]
[C022]
[C026]
Output terminal
function
Electronic thermal alarm (Motor) [THM]:
This signal turns on when the "Electronic
thermal load ratio monitor (Motor) [d104]" is
equal to or greater than the [C061] setting
value.
13
Electronic thermal
warning level [C061]
[THM] Output
Output current
ON
Electronic thermal load ratio
monitor (Motor) [d104]
Q
!
A