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Siemens Building Technologies Basic Documentation LMV5... CC1P7550en
HVAC Products 18 Addendum 3: Variable speed drive (VSD) module 13.08.2004
18.1.4 Configuration of current interface
The VSD is controlled via a current interface which can be switched from 0...20 mA to
4...20 mA, or vice versa.
Parameter: Analog Output (0...20 mA / 4...20 mA)
If the VSD requires an input signal of DC 0...10 V, a resistor of 500 Ω ±1 % must be
connected parallel to its input.
18.1.5 Configuration of fuel meter
The module can be used with fuel meters having a Namur or Reed output or open col-
lector (pnp).
To be able to adapt the module to different types of meters, the number of pulses corre-
sponding to a volume unit must be parameterized in the system.
The setting requires 4 or 5 decimal points. If one of these values shall be changed, the fol-
lowing setting procedure is required on the following menu:
«Params & Display» → «VSD Module» → «Configuration» → «Fuel Meter»
→ «Pulse Value
Gas» or
«Params & Display» → «VSD Module» → «Configuration» → «Fuel Meter»
→ «Pulse Value
Oil»
The pointer indicates the unit to be selected (1 m
3
/ 1ft
3
)
P u l s e V a l u e G a s
C u r r : 3 . 0 0 0 0
1 m
3
= 3 . 0 0 0 0
The proposed unit can be changed with
SELECT.
When pressing
Enter, the pointer jumps to the first position of the display section with
the numbers.
P u l s e V a l u e G a s
C u r r : 3 . 0 0 0 0
1 m
3
= 3 . 0 0 0 0
SELECT can be used to change the digit with the highest value of the numerical num-
ber, or
ENTER can be pressed to switch to the next digit.
After selecting the last decimal place and pressing
Enter, the value will be adopted.
After selecting the last decimal place and pressing
Enter, the value will be adopted.
The setting procedure for «Pulse Value Oil» is the same as that for «Pulse Value Gas»,
the selectable units being 1 l or 1 gal.
Note
Pulse value gas
Pulse value oil
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