Siemens LMV36.520A1 - Fan Control; VSD and PWM Fan Activation

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Building Technologies Division Basic documentation LMV36... CC1P7544en
Infrastructure & Citiies Sector 13 Fan control 25.09.2013
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...
Bild 332e/1010
X64
VSD X74
M
VSD
Sensor L
Sensor disk
Actual speed
PWM
Or
4
5
3
2
1
4
5
3
2
1
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
542
Activation of VSD / PWM fan
0 = inactive
1 = active

Note
For configuration of the analog output when the VSD is activated, refer to chapter
Power output X74 pin 3!