Protective Functions; Electronic Thermal - Larsen & Toubro C*2000 Series User Manual

Chapter 10 Protective Functions

10. Protective Functions

10.1Electronic Thermal

Group Code
Function
F50
group 1
F51
F52
F53
Select F50 – [Electronic thermal select] to 1.
It activates when the motor is overheated (time-inverse). If current is greater
than that set in F51, inverter output is turned off for the preset time in F51.
 F51: Enter the value of max current that is capable of flowing to the motor
continuously for one minute. It is set in percent of motor rated current. The
value cannot be set lower than F52.
 F52: Enter the amount of current for continuous operation. Normally motor rated
current is used. It cannot be set greater than F51.
 F53: For a standard motor, cooling fans are equipped; however, cooling effects
can be achieved when a motor is running at low speed. A separately powered
cooling fan is used.
F53 Motor cooling type
Current for continuous operation [%]
10-1
Parameter
ETH (Electronic thermal)
select
Electronic thermal level
for 1 minute
Electronic thermal level
for continuous
Motor cooling type
Standard motors having a cooling fan directly
0
connected to the shaft
Special motor that uses a separately powered
1
cooling fan.
100
95
H53 = 0
65
20
Set Value Range
1 0 ~ 1
- 50 ~ 200 150
- 50 ~ 150 100
- 0 ~ 1
H53 = 1
Output freq [Hz]
60
Initial Unit
0
%
%
0
Cx2000 AC Drive