Fan Control; Function Principle; Activation Of Vsd/Pwm Fan - Siemens LMV36.520A1 Basic Documentation

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13 Fan control

13.1 Function principle

Optionally, the LMV36... system can be operated with a VSD or PWM fan. Control is
accomplished via a DC 0...10 V interface. For control of the fan's speed, a safety-
related speed feedback signal is required. With pneumatic fuel-air ratio control, the
speed feedback signal is not evaluated. To facilitate the use of fans with different speed
ranges, the fan's speed is standardized between 0...100%. If fan control is not
connected, a load output and, alternatively, a fuel meter output are available (refer to
chapters Load output X74 pin 3 and Fuel meter input X75 pin 1 / X75 pin 2).
LMV...
5
4
3
2
1
Bild 332e/1010
Figure 81: Function principle of fan control

13.2 Activation of VSD/PWM fan

The VSD can be activated in any of the operating modes (parameters 201 and 301).
No. Parameter
Activation of VSD / PWM fan
542 0 = inactive
1 = active
Note
For configuration of the analog output when the VSD is activated, refer to chapter
Power output X74 pin 3!
Basic documentation LMV36...
13 Fan control
5
Actual speed
4
3
2
1
Sensor disk
VSD
Or
PWM
Sensor
L
CC1P7544en
25.09.2013