User Manual
EM303B General Purpose Inverter
129
Overload Pre-alarming
8.9.1
Overload Pre-alarming Control
No.
Function
Range
Unit
Default Type
F7-00
Overload Pre-Alarm
Control
Ones place
:
Overload pre-alarm detection
0: Detect all the time
1: Detect at constant speed
Tens place: inverter status after
pre-alarming
0: Alarm on, run continuously
1: Delayed stop after alarm
00
〇
Overload pre-alarm status is enabled that mean present current of inverter exceeds overload
detection scale and the remaining time exceeds the overload detection time. User can define
the detection scale and remaining time.
Overload pre-alarm detection
F7-00 ones place=0
Overload pre-alarm detection will work all the time during operation of
inverter.
F7-00 ones place=1
Overload pre-alarm detection only works when the system works at
constant speed.
Running mode of inverter at overload pre-alarm
F7-00 tens place=0
There is pre-alarm after reaching the overload pre-alarming scale, and
inverter will run continuously.
F7-00 tens place=1
When reaching the overload pre-alarming scale, inverter will pre-alarm
first and stop automatically after delayed for a while. The delay time is set by F7-03. (Please
use this function with the overload pre-alarm function of multi-function output terminal in
order to obtain output display before inverter stopped.)
No.
Function
Range
Unit Default Type
F7-01
Overload Pre-alarm Detection Time
0.00
~
60.00
S
5.00
〇
F7-02
Overload Pre-alarm Detection Scale
0.00
~
600.00
%
200.00
〇
F7-03
Overload Pre-alarm Stop Delay Time 0.00
~
600.00
S
5.00
〇
F7-01 Overload pre-alarm detection time
It defines that inverter will output overload pre-alarm signal after the output current exceeds
the overload pre-alarm detection scale (F7-02) continuously for certain time.
F7-02 Overload pre-alarm detection scale
It defines the current threshold of overload pre-alarming. The setting value of F7-02 is the
percentage to the rated current.
F7-0
3
Overload pre-alarm stop delay time
If F7-00 tens place=1, its stop delay time is set by F7-0
3
.
See Figure 7-23 overload pre-alarm control logic diagram for the description of parameters
stated above.