ECKELMANN VS 3015 CT, Инструкция по эксплуатации, Страница: 22 / 219

Firmware V1.41 V1 08.11.2022 22/219
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TRANSDUCER ID: XXXXX Description Input Default Dim.
HP-Min XXX b Pressure for 4 mA or 0 V at the output of
HP pressure sensor 0..2.0 1.0 bar
HP-Max XXX b Pressure for 20 mA or 10 V at the output
of HP pressure sensor 100.0..200.0 140.0 bar
MP-Transmitter → Selection of signal interface pressure
transmitter MP (4..20 mA or 0..10 V) → Screen 3-1-a-c
MP-Min XXX b Pressure at 4 mA or 0 V at the output of
the MP pressure sensor 0..2.0 1.0 bar
MP-Max XXX b Pressure at 20 mA or 10 V at the output
of the MP pressure sensor 23.0..100.0 60.0 bar
LP Z2-Transmitter → Selection of signal interface pressure
transmitter LP Z2 (4..20 mA or 0..10 V) → Screen 3-1-a-d
LP Z2-Min XXX b Pressure at 4 mA or 0 V at output of LP
Z2 pressure sensor (LT) 0..2.0 1.0 bar
LP Z2-Max XXX b Pressure at 20 mA or 10 V at output of
LP Z2 pressure sensor (LT) 25.0..80.0 26.0 bar
5.3.1 Low Pressure Transmitter Z2 (LP-Z2)
For installations in which the normal temperature (NT) zone is regulated using a controller and a low
temperature (LT) satellite compressor is activated directly using a case controller with electronic injection
valves, the controller can determine the suction gas temperature of the LT circuit (Z2 circuit) and transmit this to
the case controller via CAN bus for determining the superheat. This enables superheat regulation for the case
controller of the LT circuit (Z2 circuit) using the evaporator outlet temperature and suction gas temperature.
In order to measure the suction gas temperature of the LT circuit (Z2 circuit), a pressure transmitter with a
measuring range from 1 to 26 bar must be connected to the analogue input 3 (terminals 41/42) of the controller.
The function is activated using the
Transducer Z2 parameter (menu 3-1).
5.4 Low-Pressure Regulation
The low-pressure regulation has the task of maintaining the suction side pressure at a specified setpoint. The
controller provides two different methods for this regulation task:
Step controller
Regulation by loading and unloading compressor stages or compressor capacity stages
Damage to the system and stock loss: Incorrect parametrisation of the pressure transmitters can
result in high impairments of the functions! If any of these parameters is changed, the message
Changed Sens. type is output.
Practical tip using the example of the "connection of a pressure transmitter - 1 .. 7 bar": The
indication on the pressure transmitter here (> -1 bar) is obviously relative to the ambient pressure. The
adjustment of the pressure transmitter in the controller is carried out using absolute pressure values
(the absolute pressure cannot be negative). In order to parametrise the above pressure transmitter
with the relative pressure indication -1 bar (at 4 mA or 0 V) and 7 bar ( at 20 mA or 10 V), the ambient
pressure (1 bar) must be added. The input in this example is as follows: 0..8 bar.
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The controller functions quasi as a sensor for the suction gas temperature of the LT circuit (Z2 circuit)
and the required low pressure in Z2 is transmitted via the CAN bus. The CAN bus address and the
temperature zone Z2 of the pack controller providing this pressure via the CAN bus must be input at
the case controller.
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