Output current
Inverter
Output frequency
H64 (Low Frequency
during Protecting Overload)
Target (set) frequency
The drop in frequency is
calculated by automatic con
troller
1st Overload Protect Level
F44
Overload Prevention Control
Set the rate of decline of the output frequency of overload prevention control. This function causes the
inverter output frequency to drop before the cooling fin of the inverter overheats (alarm code: 0H1) or
an overload trip occurs (alarm code: 0LU), and thus prevents tripping. This function is applicable in
equipment such as pumps where the load reduces with a drop in the output frequency, but it is neces-
sary to continue with the operation even when the output frequency drops.
Allocating “36: OLP (Overload prevention controlling)” to Output Terminal [DO1] Function Selection,
Output Terminal [DO2] Function Selection and Output T
erminal [ROA, ROB] Function Selection acti-
vates overload prevention control and indicates that the output frequency changes, and the signal
“OLP” that turns ON during the overload prevention control is output.
Parameter No. Function name Data
Default da-
ta
Unit
H70 Overload Prevention Control
0.00: Depend on selected de-
celeration time
*1
0.01 to 100.00 Hz/s
999: Cancel
999 Hz/s
E20, E21, E27
Output Terminal [DO1] Function
Selection, Output Terminal
[DO2] Function Selection, Out-
put Terminal [ROA, ROB] Func-
tion Selection
36: OLP (Overload prevention
controlling)
- -
Related function
Output T
erminal [DO1] ON Delay Time (H309),
Output Terminal [DO2] ON Delay Time (H31
1),
Output Terminal [ROA, ROB] ON Delay Time (H313),
Output Terminal[DO1] OFF Delay Time (H310),
Output Terminal[DO2] OFF Delay Time (H312),
Output Terminal [ROA, ROB] OFF Delay Time (H314)
- -
*1. Deceleration is performed according to the currently selected deceleration time by the SET, RT1 and RT2
terminals.
*2. The OFF delay becomes the time obtained by adding 0.1 s to Output Terminal [DO1] OFF Delay Time
(H310), Output Terminal [DO2] OFF Delay Time (H312) and Output T
erminal [ROA, ROB] OFF Delay Time
(H314).
7 Other Functions
7-83
M1 Series Standard Type User's Manual (I669)
7-8 Functions Related to Protection, Warning and Various Output Signals
7
7-8-1 Current Limit/Overload Prevention Control/Overload Warning
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