Fuel Meter; Fuel Meter Input X71 / X72; Configuration Of Vsd - Siemens LMV51 Series Basic Documentation

Fuel meter

Fuel meter input
X71 / X72
Siemens Building Technologies
HVAC Products
To acquire the amount of fuel consumed, up to 2 fuel meters can be connected. As-
signment to the type of fuel is fixed.
To adapt to different types of fuel meters, assignment of the number of pulses and the
resulting fuel throughput must be parameterized.
Type of sensor:
Frequency:
3
Pulses / l or gal, m :
3
Pulses / ft :
Power supply:
Switching current:

18.1.2 Configuration of VSD

The VSD must be configured in accordance with the type of motor connected.
The times set for the acceleration and deceleration ramps must be shorter than the
times of the ramps parameterized for the LMV5x.2... with electronic fuel / air ratio con-
trol.
Example: Ramp of 10 seconds ⇒ VSD ramps to be set to 7 seconds.
The motor must be able to follow the parameterized VSD ramp.
If this is not observed, the predefined speeds will not be reached within the respective
periods of time.
The configuration of the current / voltage interfaces of the VSD must be in accordance
with the configuration of the LMV5x.2... VSD module.
The minimum output frequency of the VSD must be set to 0 Hz. To ensure that the fan
motor will reach the required speed under all operating conditions, the VSD during con-
figuration will be controlled with a maximum of only 95 % of the positioning signal. If the
burner's rated capacity calls for full fan speed, the maximum output frequency must be
set to 105.2 % of mains frequency.
Basic Documentation LMV5...
18 Addendum 3: Variable speed drive (VSD) module
inductive sensor to DIN 19234 (Namur) or
open collector (pn) with U
Reed contact
≤ 300 Hz
≤ 9999.9999 (to be parameterized)
≤ 999.99999 (to be parameterized)
DC 10 V, max. 15 mA
> 10 mA
< 4 V, U > DC 15 V or
CEsat CEmin
CC1P7550en
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13.08.2004