Hitachi SJ Series, User Manual

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12-19-7
Chapter 12 Inverter Function
12.19.5 Outputting a warning when the
current is low
• I want to make a notification with a warning about a
decrease in the output current of the motor.
• I want to detect a decrease in the motor current
when the load dropout in the load occurs.
• Assign the output terminal functions 033 [LOC] and
034 [LOC2] low current signal to one of [CC-01] to
[CC-07] that corresponds to the output terminal
and output the signal.
• The low current detection signal can be output
when the load has reduced.
• When [CE101] = 00
Parameter
• Small fluctuations in the frequency input may
hinder the speed from being determined as
constant when an analog input is used as the
frequency command. In this case, change the low
current signal output mode selection [CE101] to 00
(valid in operation).
• The low current signals 033 [LOC] and 034 [LOC2]
will be output when the output currents becomes
lower than the low current detection levels [CE102]
and [CE103], respectively.
• You can output the signal in accordance with the
operating state by changing the low current signal
output mode selection [CE101].
• When [CE101] = 01
Item Parameter Data Description
Output terminal function
selection 11-15
[CC-01]~[CC-05]
033
034
033 [LOC]: Low current signal 1 is
output.
034 [LOC2]: Low current signal 2 is
output.
OFF: Less than or equal to the low
current signal level
ON: More than or equal to the low
current signal level
Relay output terminal function
selection 16A-16C
[CC-06]
Relay output terminal function
selection AL1-AL0/AL2-AL0
[CC-07]
Low current signal output mode
selection
[CE101]
00
Valid in operation
01
Valid only in constant speed operation
Low current detection level 1 [CE102]
(0.00 to 2.00) x inverter rated
current
Specify the current level at which the low
current prewarning signal is output.
The signal will be output when the
current becomes lower than the low
current prewarning detection level.
Low current detection level 2 [CE103]
Ｑ
Ａ
！
Low current signal
level
[CE102]
[CE103]
Output current
[LOC] output
[LOC2] output
Output
frequency
Low current signal
level
[CE102]
[CE103]
Output current
[LOC] output
[LOC2] output
Output
frequency