ECKELMANN VS 3015 C, Инструкция по эксплуатации

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on the gas cooler outlet temperature.
5.5.1 Control of high pressure control valve
The high pressure is regulated by a continuous HP control valve using a PI controller which calculates an
opening degree for the valve via a control signal (0..10 V) from the controller. However, a configurable minimum
value is not undercut. The amplification factors for the P-component (parameter
P-Wert , see menu 3-2-2-2), the
I-component (parameter i-factor , see menu 3-2-2-2) can be configured. If all available compressors have failed
or if the input System.OFF is active, the HP control valve is closed).
The HP control valve can also be operated in manual mode. Using the parameter Man. op. xxx % in menu
3-2-2 -2), the valve opening degree can be set from 0... 100%. If "---" is entered, the opening degree is
controlled via the controller.
In the event of a failure of the HP transmitter, a voltage of 5 volts is applied at the output for the HP control
valve (middle opening degree)
Neutral zone HP control
A neutral zone is provided for the HP valve to prevent many load changes. If the high pressure is within a
neutral zone, the correcting variable of the HP valve ( 0 to 10 volts output) is not changed. If 0.0 bar is specified
as the HP neutral zone (parameter
Neutr.zone HP , see menu 3-2-2-2), this function is deactivated.
HP valve control for stopped compressors
The parameter HPV off w/comp (see menu 3-2-2) defines whether the HP valve is closed for stopped
compressors. If the parameter is set to YES , zero volts is output as control signal if the high pressure has
undercut the HP On Comp (see menu 3-3) HP limit value and all compressor stages are unloaded. With the
switching on of the first compressor stage, at least the minimum control signal is output again immediately
(parameter
Min contr val., see menu 3-2-2) . The HP valve is not closed if the parameter is set to NO . The
signal calculated by the controller or the minimum control signal is maintained.
Limitation of the HP valve opening degree by the medium pressure
The maximum opening degree of the HP valve in normal operation is 100% (10 volts at the output of the
controller). If the pressure difference between the maximum permissible medium pressure and the actual value
reduces, the maximum opening degree of the HP valve reduces to prevent any further increase of the medium
pressure to critical values.
The limitation is used if the average value of medium pressure, setpoint and maximum pemissible medium
pressure is exceeded (parameter
Setp. MP menu 3-2-3 and parameter MP Off Comp , menu 3-3 ).
When the maximum permissible medium pressure is reached, the opening degree of the HP valve is 15% plus
the minimum required opening degree (parameter
Min contr val., see menu 3-2-2).
5.5.2 High pressure setpoint calculation
The setpoint for the HP regulation depends on the operating mode of the regulation. Setpoint calculation is
performed in normal and in HRC operation. The heat recovery mode can be activated and deactivated using
the parameter
Ht. rec. mode Y/N (menu 3-2-2-2). The activation and deactivation of the heat recovery mode are
performed using the digital input 21 (terminals 90/91) or via CAN bus from an external controller.