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HP regulation setpoint calculation in normal operation
The HP setpoint is calculated depending on the gas cooler outlet temperature.
The calculated high pressure setpoint ensures optimal use of energy under supercritical and subcritical
conditions. The HP setpoint is limited by the parameters
HP-Min
and
HP-Max
(menu 3-2-2). Any desired
supercooling is also taken into account. The supercooling can be configured using the parameter
Subcooling
(menu 3-2-2).
HD regulation setpoint calculation in HRC mode
In HRC mode, the HP setpoint can be determined using three different methods:
•
Calculation using the HRC outlet temperature
•
Specification using an external signal (0..10 V)
•
HP setpoint specification from an external controller via CAN bus
Setpoint calculation using HRC outlet temperature
A setpoint is calculated that prevents any condensation of the refrigerant in the heat exchanger.Any specified
superheat is not undercut for this. The superheat can be configured using the parameter
subcool.HRC
in menu
3-2-2. The HP setpoint may not exceed the limit value
HP-Max.HRC
(menu 3-2-2). If the sensor for the heat
recovery outlet temperature is defective, the system is switched to controlled operation.
Setpoint specification by an external 0..10 V signal
The HRC setpoint is shifted using an external 0..10 V signal into the limits
HP-Min.HRC
and
HP-
MAX.HRC
(
menu 3-2-2-3). A lower limit value can be specified using the offset
Off.ext.Sig.
to, for example,
connect a 1..10 V signal. If any signal offset is specified, an error message
M.err.ext.HP-shift
is output if the
signal undercuts the value
Off.ext.Sig.
(cable break detection).
HD setpoint specification from an external controller via CAN bus
This function is only possible in combination with a GLT 3010. The operating mode can only then be activated if
the parameter
HRC- mode = YES
and the parameter HRC-Pump
= YES
(menu
3-2-2-3) and an HRC request
telegram is sent from the GLT 3010.
The setpoint calculation in this operating mode is performed by the external controller.
5.6 Gas cooler outlet temperature regulation
The gas cooler outlet temperature is regulated using the gas cooler fans
.
Regulation
Various types of control (menu 3-2-2-1-a) are provided for the fan control:
•
Step controller
Regulation using enable and disable of fan capacity stages.
•
Speed controller
Regulation using speed controller (continuous control). The high pressure control is performed here
using an analogue signal which specifies the required speed to the speed controller. The fans are all
permanently connected in parallel to the speed controller.
If the sensor for the gas cooler outlet temperature is defective an HP setpoint of 80 bar is implemented.
Содержание VS 3015 C
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