Hitachi SJ Series, User Manual

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12-19-6
Chapter 12 Inverter Function
12.19.4 Outputting a warning when an
overload occurs
• I want to know an increase in the output current of
the motor from a warning signal.
• I want to know an increase in the motor current at
its early stage.
• Assign the output terminal functions 035 [OL] and
036 [OL2] overload prewarning signal to one of
[CC-01] to [CC-07] that corresponds to the output
terminal and output the signal.
• The overload prewarning signals [OL] and [OL2]
will be output when the output currents exceed the
corresponding overload prewarning level.
• You can output the signal in accordance with the
operating state by changing the overload
prewarning signal output mode selection [CE105].
• This function is effective, especially for conveyors,
to prevent machine failure that may occur when the
load increases because an excessive number of
packages are loaded, or to prevent carrier lines
from stopping because of an overload error of the
inverter.
• When [CE105] = 00
Parameter
• An overcurrent error may occur before the signal is
output when the overload prewarning level has
been set to an excessively high value. In this case,
reduce the overload prewarning level.
• 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
overload prewarning signal output mode selection
[CE105] to 00 (valid in operation).
• When [CE105] = 01
Item Parameter Data Description
Output terminal function
selection 11-15
[CC-01]~[CC-05]
035
036
035 [OL]: Overload prewarning signal
1 is output.
036 [OL2]: Overload prewarning
signal 2 is output.
OFF: Less than or equal to the
overload prewarning signal level
ON: More than or equal to the
overload prewarning signal level
Relay output terminal
function selection 16A-16C
[CC-06]
Relay output terminal
function selection
AL1-AL0/AL2-AL0
[CC-07]
Overload prewarning
signal output mode
selection
[CE105]
00
Valid in
operation
01
Valid only in constant speed operation
Overload prewarning
signal level 1
[CE106]
(0.00 to 2.00) x inverter
rated current
Specify the current level at which the
overload prewarning signal is output.
The signal will be output when the
current exceeds the overload
prewarning signal level.
Overload prewarning
signal level 2
[CE107]
Ｑ
Ａ
！
Overload prewarning
level
[CE106]
[CE107]
Output current
[OL] output
[OL2] output
Output
frequency
Overload prewarning
level
[CE106]
[CE107]
Output current
[OL] output
[OL2] output
Output
frequency