Frequency converter 'frequency'
dreizler A 3001 E - 18.12.2015 | A 2064 - 1.14 | EN - 13.06.2014
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45 Frequency converter 'frequency'
45.1 'frequency' speed control
The 'frequency' speed control uses a gas/air ratio control as mixture regulation for the control and allocation
of fuel and air. This simplifies the burner configuration at any load position, as air pressure generates a con-
trolled gas pressure inside the burner head.
Regardless of whether the air pressure is generated by means of the
- Air damper position, or
- Motor speed.
The frequency converters 'frequency' control motor speed steplessly via the air damper position. For each
air damper position, a fixed motor speed value is therefore allocated, which changes in line with the move-
ment of the air damper.
The 'frequency' burner with integrated frequency converter is controlled in a modulating manner, i.e. the
gas valve provides control depending on air pressure, and releases gas pressure. Via the actuator poten-
tiometer A 0 - 10V impulse is generated, which mirrors the air damper position. This impulse drives the fre-
quency converter towards the associated motor speed.
The air pressure is generated parallelly by means of the blower speed and damper controls. Blower speed
runs parallelly to the damper position between 1000 and 3000 rpm, saving motor capacity and power con-
sumption.
Fig. 45-1 Schematic 'frequency' burner
1
Frequency converter
2
Noise dam cap
3
Electric motor
4
Control panel with automatic firing device and wiring
5
Air damper with actuator and potentiometer
6
Gas ramp
