Outputting A Warning When Current Is Low - Hitachi WJ Series User Manual

Chapter 9
9.11.4

Outputting a Warning When Current Is Low

 How to make a notification that the output current of the motor has dropped?
Q
 How to detect a decrease in the motor current when a load is released?
 Assigning "Low current signal [LOC] (43)" to one of the output terminal functions
A
([C021]/[C022]/[C026]) enables the inverter to output a low current signal.
 A low current detection signal can be output when the load becomes lighter.
 The low current signal is output when the output current falls below the "Low current detection
level [C039]".
 By changing the "Low current signal output mode selection [C038]", the signal can be output
according to the operating state.
 When an analog input is used for the output frequency command input source, the frequency
!
command input may not be determined as constant speed due to fine fluctuations in the
frequency input. In this case, change the "Low current signal output mode selection [C038]" to
"Enable during running (00)" or increase the "Analog input filter time constant [A016]".
Code
Low current signal
[C038]
output mode selection
Low current detection
[C039]
level
Overload signal filter
[C902]
time constant
[C021]
Output terminal
[C022]
function
[C026]
■ When [C038] is set to "Enabled during running (00)"
Output current
Output frequency
[LOC] Output
■ When [C038] is set to "Enabled only during constant speed (01)"
Output current
Output frequency
[LOC] Output
Item
Enable during running.
Enable only during constant speed
Sets the output current level at which
the overload warning signal is output.
Sets the filter that acts on the [OL],
[OL2], and [LOC] detection levels.
Low current signal [LOC]:
This signal turns on when the
output current falls to or below
the low current detection level.
ON
9-11-4
Description
Low current
detection level
[C039]
ON
Low current
detection level
[C039]
ON
Inverter Functions
Data
00
01
(0.00 to 2.00) ×
inverter rated current (A)
0 to 9,999 (ms)
43