138/267
Building Technologies Basic documentation LMV37.4... CC1P7546en
12 Fan control 17.12.2018
12.12 Control of fan motor with pneumatic fuel-air
ratio control
For the fan motor control for burners with pneumatic fuel-air ratio control, only the
control path is used with the factory setting
There is no need to connect a speed feedback signal and to have speed control (for
operating modes, refer to chapter Selection of operating mode).
If speed monitoring is required in the pneumatic ratio control, additional supervision
thresholds can be activated (see chapter Acquisition of speed or Extended speed
supervision).
12.13 EMC of LMV37.4 and VSD
The function and EMC tests with the LMV37.4 have been successfully conducted in
connection with the following makes and types of VSDs:
Siemens: SED2-0.37 / 22 X
Danfoss: VT2807
During operation, VSDs generate electromagnetic interference on the mains network.
For this reason, the supplier’s specifications must be strictly observed to ensure that
makeup of the system is in compliance with EMC regulations:
Siemens: Operating Instructions installation conforming to EMC
Danfoss: Technical Brochure radio suppression filter
Data Sheet on Danfoss EMC filter for long motor cables
Caution!
When using other types of VSD, compliance with EMC regulations and trouble-
free operation are not ensured!
12.14 Special conditions for PWM fan in
electronic fuel-air ratio control system
When using a PWM fan in the electronic fuel-air ratio control system, different conditions
must be observed or complied with.
This is connected, among other things, with the different properties of the PWM fan
compared with VSDs.
Fan characteristic
Load dependency of the speed
Reduced braking performance
Acquisition of speed
To Next Page
Loading...
Need help?
General
