EQJW145:
Heating controller
Commissioning
30 7010015003 A
© Fr. Sauter AG
Maximum limit values for quantity metering
SP29, SP30 and SP31 specify maximum limit values for quantity metering
(i.e. usually for the flow or heat quantity/power). SP29 defines the maximum
limit value for heating and DHW, SP30 only defines this value for the heating
and SP31 only defines it for DHW. The value is always entered in units of
'pulses per minute'. See the following examples of converting the limit value
for the flow volume or power to the 'Pulses per minute' variable.
Example 1:
The flow volume should be limited to 1.6 m³ / hour.
The flow sensor transmits a signal of 50 pulses / litre.
The following conversion: 1.6 m³ / hour = 1,600 litres / hour and 1600 litres /
hour = 26.67 litres / minute, and the flow sensor variable of 50 pulses / litre,
give a limit value that must be entered on the EQJW145 (SP29, SP30 or
SP31) of 26.67 litres / min x 50 pulses / litre = 1333 pulses / min.
Example 2:
The power in heating mode should be limited to 35kW. With simultaneous
heating operation and DHW heating, 50 kW should be allowed. A heat
quantity meter is available which outputs 1200 pulses / kWh.
The following conversion: 35 kW = 35 kWh / h and the given variable for the
heat quantity meter provide 35 kWh / h x 1200 pulses / kWh = 42,000 pulses
/ h. This gives a value that must be entered on the EQJW145 of 42,000
pulses / h = 42,000 : 60 pulses / min = 700 pulses / min. The second limit
value is 50 kW. The same conversion: (50 kWh / h x 1200 pulses / kWh x 1h
/ 60 min = 1000 pulses / min) gives a value of 1000 pulses / min that must be
entered in the EQJW145. In the EQJW145, a value of 1000 should be
assigned to SP29 and a value of 700 to SP30.
The EQJW145 switches automatically between the following two measuring
methods.
measurement of time interval (time interval measurement) between two
pulses and calculation of the 'pulses per minute' variable
measurement of the number of pulses per minute (pulse measurement) .
If the three set limit values (SP29 to SP31) are in the range 0.1 - 16.0, the
EQJW145 automatically switches over to time interval measurement. If a
value between 60 and 16.000 is entered for one of SERVice parameters
SP29 to SP31, the controller switches over automatically to pulse
measurement.
SP29 - SP31
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