Pulse Valency - Siemens Synco 700 Series Basic Documentation

Types of meter
Setting
Notes on "Meter 1"
Notes
Example 1
Example 2
Building Technologies
HVAC Products
The pulse values represent:
• Energy in kJ, MJ, GJ, Wh, kWh or MWh
3
• Volume in m
, l or ml
• Variables without unit (max. 3 decimal places)
• Heat cost unit
• BTU (British Thermal Unit)
The pulses are converted to consumption values as per the setting values, added, and
the cumulated values are stored as 15-month values at midnight upon month rollover.
The meters are used to optimize plant operation. Also, they are mandatory for pulse
limitation.
The following types of meter can be used:
• Mechanical pulse sources (Reed contact) without Namur circuit with a maximum
pulse frequency of 25 Hz and a minimum pulse duration of 20 ms
• Electronic pulse sources with a maximum pulse frequency of 100 Hz and a minimum
pulse duration of 5 ms
Electronic pulse sources, such as Open Collector outputs, generate shorter and less
bouncing pulses than mechanical pulse sources, such as relays or Reed contacts.
To ensure full flexibility of use, the type of meter can be selected:
Main menu > Commissioning > Settings > .... or
Main menu > Settings > Inputs > RMK770.X... (or RMZ78.... )
Operating line
Type
Each meter can be assigned a name (refer to subsection 11.3.7 "Assignment of texts").
If text is entered and the meter is called up, the meter's name appears in place of
"Meter 1" (or 2, 3 or 4).
• The pulse counter integrated in the RMK770 controller is not suited for billing pur-
poses due to insufficient accuracy. Only direct meter readings (heat meters, electric-
ity meters, etc.) deliver valid values
• Meters using Namur or S0 circuitry are not supported
• A total of 4 independent meters are available

11.3.3 Pulse valency

Every pulse delivered by a pulse source corresponds to a certain consumption value.
The pulse valency is printed on the consumption meter. Pulse valency must be entered
as a numerator and denominator.
Settings: Pulse valency numerator = 20
Pulse valency denominator = 1
Pulse unit = liter
Pulse valency = 20 liters/pulse
Settings: Pulse valency numerator = 10
Pulse valency denominator = 3
Pulse unit = Wh
Pulse valency = 3.33 Wh/pulse
Boiler sequence controller RMK770
11 Data acquisition
Range
Mechanical /
Electronic
Factory setting
Mechanical
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CE1P3132en
23.04.2009