Outputting A Warning When Overload Occurs - Hitachi WJ Series User Manual

Chapter 9
9.11.3

Outputting a Warning When Overload Occurs

 How to be notified of the increase in the motor output current by a warning signal?
Q
 How to be notified of the increase in motor current as soon as possible?
 Assigning an "Overload warning notice [OL] (03)" or "Overload warning notice 2 [OL2] (26)" to
A
one of the output terminal functions ([C021]/[C022]/[C026]) enables the inverter to output an
overload warning signal.
 The overload warning signal is output when the output current exceeds the overload warning
level.
 By changing the "Overload signal output mode selection [C040]", the signal can be output
according to the operating status.
 If the overload warning level is set too high, an overcurrent error may occur before the overload
!
warning signal is output. In this case, lower the overload warning level.
 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 "Overload signal output mode selection [C040]" to
"Enable during running (00)" or increase the "Analog input filter time constant [A016]".
Code
Overload signal
[C040]
output mode selection
*1
[C041] Overload warning level
[C111] Overload warning level 2
Overload signal filter
[C902]
time constant
[C021]
Output terminal
[C022]
function
[C026]
*1. Parameter for "Second Control [SET]". ting also applies to the second control parameter.
■ When [C040] is set to "Enable during running (00)"
Output current
Output frequency
[OL] Output
[OL2] Output
■ When [C040] is set to "Enable only during constant speed (01)"
Output current
Output frequency
[OL] Output
[OL2] Output
Item
Enabled during running
Enabled 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.
Overload warning notice [OL]:
This signal turns on when the output
current exceeds the overload warning level.
Overload warning notice 2 [OL2]:
This signal turns on when the output
current exceeds the overload warning
level 2.
ON
ON
ON
9-11-3
Description
Overload warning level
[C041]/[C241]
[C111]
Overload warning level
[C041]/[C241]
[C111]
ON
Inverter Functions
Data
00
01
(0.00 to 2.00) ×
inverter rated current (A)
0 to 9,999 (ms)
03
26