ECKELMANN VS 3015 CT, Инструкция по эксплуатации, Страница: 93 / 219

Firmware V1.41 V1 08.11.2022 93/219
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5.11 Oil Return
The oil return function can be activated using the Oil return parameter (menu 3-2-2-4) .
A solenoid valve is controlled for this. The solenoid valve is controlled via the relay output 2 of the Modbus
module
MR-DOA4 . A time window (parameter Interval , menu 3-2-2-4) and the duration of the oil return can be
varied (parameter Dur. Oil-return , menu 3-2-2-4).
Example: At the default interval of 2 min. and a set duration of 60 s, the solenoid valve for the oil return will be
50% OPEN and 50% CLOSED during this time.
In principle, oil return is active when:
the oil level exceeds the minimum value and an alarm is signalled via the oil management status at digital
input 5 (ejector SIOX module, terminals 58/59).
overheating occurs. This occurs when the level in the accumulator exceeds the level of the last accumulator
sensor (digital input 1..4 on the ejector SIOX module).
For details, see chapter Terminal assignment of the digital inputs 230 V AC .
5.12 Monitoring
In addition to control and regulation functions, the following monitoring functions are integrated in the controller:
Safety chain
- Oil differential pressure switch monitoring
- Compressor high pressure limiter
- Motor overload cut-out
Compressor cylinder head temperature
Low-pressure
High-pressure
Medium pressure
Refrigerant
Burst disk / maximum refrigerant fill level
Fast unload / external OFF
Speed Controller
Condenser / fan motors
Switching frequency
Minimum superheat
Gas cooler outlet temperature
CO
2
cascade
Accumulator fill level
Oil level
5.12.1 Safety Chain
For reasons of redundancy of the monitoring system, precautionary measures, in addition to the monitoring
functions of the controller, have been taken to disable all or individual compressors of a pack under critical
operating conditions. The switching contacts used for this due to the type of wiring of the system are prioritised
below in ascending order:
Disable all compressors
1. Safety high pressure cut-out
2. HP limiter
3. NP limiter
Disable relevant compressors
4. Compressor high pressure limiter
5. Compressor motor overload cut-out