Motor Controllers AC Variable Frequency Drives
RVBS
Specifications are subjected to change without notice.10/08/2021
38
F10 specifies the detection level (in amperes) at which the electronic thermal overload protection becomes
activated. In general, set F10 to the rated current of motor when driven at the base frequency (i.e., 1.0 to 1.1
multiple of the rated current of motor 1 (P02)). To disable the electronic thermal overload protection, set F10
to "0.00: Disable."
-
Thermal time constant (F11)
F11 specifies the thermal time constant of the motor. If the current of 150% of the overload detection level
specified by F10 flows for the time specified by F11, the electronic thermal overload protection becomes
activated to detect the motor overload. The thermal time constant for general-purpose motors is approx. 5
minutes by factory default.
➢
Data setting range: 0.5 to 75.0 (minutes) in increments of 0.1 (minute)(Example) When the F11 data is set
at "5.0" (5 minutes)
As shown below, the electronic thermal overload protection is activated to detect an alarm condition (alarm
code OL1) when the output current of 150% of the overload detection level (specified by F10) flows for 5
minutes, and 120% for approx. 12.5 minutes.
The actual time required for issuing a motor overload alarm tends to be shorter than the specified value,
considering the time period from when the output current exceeds the allowable continuous drive current
(100%) until it reaches 150% of the overload detection level.
< Example of thermal overload detection characteristics >
Function
code
Mod.
add.
Description
Def
Min
Max
U.M.
R/W
F09
0x0009
Motor ETH Characteristic
1
1
2
-
R/W
F10
0x000A
Motor ETH Level
210/32
9
0
567
0.01Arms
R/W
F11
0x000B
Motor ETH Thermal Time Constant
50
5
750
0.1Min.
R/W