ECKELMANN WRG 3010 E, Инструкция по эксплуатации, Страница: 32 / 113

Firmware V1.4 20.05.2021 32/113
5.4 Power Signal
The building transmits a heating power requirement separately for HT and LT to the WRG 3010 E in the form of
a 0..10 V signal. This signal should be understood as a 0..100% heating power requirement. These are read at
the analogue input 5 (terminals 48/49) for LT and analogue input 7 (terminals 59/60) and are designated as
"external power signal". If such a signal is not available, it is possible to create this signal in the WRG 3010 E
itself.
The way in which the power signal is formed must be selected during commissioning. Switching during
operation is also possible. It is also possible to set HT and LT differently. For example, this can be used if HT
and LT are present in the system and only one power signal is available from the building.
A ramp is built into the calculation of the internal power signal to protect the refrigeration pack system against
setpoint jumps of the building. This should slowly ramp up or ramp down the system. This ramp can be
adjusted in LDSWin.
The algorithms for calculating the internal power signal are the same for HT and LT. The power signal embodies
the heating requirement of the building, so to speak, and the individual heating instances are activated or
deactivated via the switch-on and switch-off points that can be adjusted in LDSWin; for details see
Visualisation
in LDSWin - HT / LT / Power Signal Setpoints . As it will almost always be the case that the two calculated power
signals (HT and LT) have different levels, the highest of the two is decisive. In the event that, for example, HT
continues to request power and LT no longer requires power, the power signal LT is successively lowered until it
falls below the "Desuperheat" switch-off point. Then the hot gas valve is closed and the LT functional unit goes
into standby. However, the heating instances requested by HT will continue to be executed.
The power calculation includes a state machine (ZM) with the following states, see Visualisation in LDSWin -
HT / LT / Power Signal Setpoints lower left corner.
ZM State Cause Effect
0
Off
There is no request from the building or the
function (HT / LT) has been deselected.
The calculated power signal remains at 0.
1 Standby The external power signal has been reached. The calculated power signal can have all values
between 0 V and 10 V.
2 Increase The external power signal is higher than the
calculated power signal. The calculated power signal is increased according to
the set ramp.
-2 Reduce The external power signal is lower than the
calculated power signal. The calculated power signal is lowered according to
the set ramp
-1 Shutdown The request from the building has been removed
or the function has just been deselected.
The calculated power signal immediately goes to 0.
Restarting the power calculation is prevented for 5
minutes.
At this point of the visualisation, there are also feedback signals from the power signal calculation.