Flow / Power Limit - Danfoss ECL Comfort 210 Installation Manual

Installation Guide

5.5 Flow / power limit

Heating circuit
A flow or heat meter can be connected to the ECL controller in
order to limit the flow or consumed power. The signal from the
flow or heat meter is a pulse signal.
When the application runs in an ECL Comfort 310 controller, the
flow / power signal can be obtained from a flow / heat meter via
the M-bus connection.
The flow / power limitation can be based on the outdoor
temperature. Typically, in district heating systems a higher flow or
power is accepted at lower outdoor temperatures.
The relationship between the flow or power limits and the outdoor
temperature is set in two coordinates.
The outdoor temperature coordinates are set in 'High T out X1'
and 'Low T out X2'.
The flow or power coordinates are set in 'Low limit Y1' and 'High
limit Y2'. Based on these settings, the controller calculates the
limitation value.
When the flow / power gets higher than the calculated limit, the
controller gradually reduces the desired flow temperature to obtain
an acceptable max. flow or power consumption.
The parameter 'Units' (ID 1x115) has a reduced setting range when
the flow / energy signal comes via M-bus.
Parameters indicated with an ID no. like "1x607" mean a universal
parameter.
x stands for circuit / parameter group.
Danfoss District Energy
ECL Comfort 210 / 310, application A260
Flow / power limitation
High limit Y2
Low limit Y1
-15
Low T out X2 High T out X1
Flow / power
limitation
Desired flow
temp.
If the 'Adapt. time' is too high, there is a risk of unstable control.
Pulse based signal for flow / energy, applied to input S7
For monitoring:
Frequency range is 0.01 - 200 Hz
For limitation:
Minimum frequency is recommended to be 1 Hz in order to have a
stable control. Furthermore, the pulses must appear regularly.
VI.LG.F2.02
Outdoor temp.
° C
15
Limit
Time
DEN-SMT/DK 57