Burkert 3280 - Derating

18
Technical data
Type 3280, 3285
6.6.1 Derating
The maximum duty cycle of the valve depends on the maximum ambient temperatures and the current required by
the stepper motor.
The duty cycle does not refer to the duty cycle of the device but to the duty cycle of the motor. This is not
switched on unless the valve is to move. Frequent set-point value changes will drastically increase the
duty cycle of the motor.
The derating curve can be used to indicate the maximum duty cycle permissible at the corresponding ambient
temperature. A lower duty cycle must be selected for high medium temperatures. By switching on the low power
function a higher duty cycle can be achieved (Warning: during low power function, max medium pressure is reduced;
if violated Valve will not move or malfunction).
5 10
10
15 20
20
30
40
50
60
70
80
90
100
25 30
35 40 45
50
55 60 65
Max. ambient temperature [°C]
Duty cycle [%]
Normal operation
Low power function
Type 3280
Seat ø 1...6 <6 bar standard
5 10
10
15 20
20
30
40
50
60
70
80
90
100
25 30
35 40 45
50
55 60 65
Max. ambient temperature [°C]
Duty cycle [%]
Normal operation
Low power function
Type 3285
Seat ø 8...25 standard
Figure 6: Derating curve for standard device
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