KGL Operating Manual – VS 3010 BS
2018-07-02
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4.12 COP
COP -
Coefficient of Performance
- is a factor without units and is used to assess the energy efficiency of a
refrigeration pack system. The greater the COP value, the more efficient the refrigeration system. In the E*LDS
system, the COP value is calculated by the pack controller and can be monitored in the LDSWin program.
4.12.1 COP optimisation
In order to prevent the system from running continuously with unfavourable efficiency (FC compressor
operates at excessive speed), the controller loads a fixed speed compressor and reduces the speed of the FC
compressor in order to switch to a more energy-efficient operating point after a delay time of 10 minutes.
4.13 Operating data and archiving
4.13.1 Operating hours of compressors and fans
The operating hours of all compressors and fans are recorded every 30 seconds and stored in non-volatile
memory. The display (menu 6-1) is shown in hours. In the case of replacement of compressors or fans or the
controller, the operating hours can be adjusted (menu 6-1-1 and menu 6-1-2).
4.13.2 Daily run times, compressor starts and activity
As well as the operating hours, the run times, compressor starts per day and the activity (utilisation) of the
pack are recorded daily and stored with date (menu 6). The data are archived in the pack controller for a
period of 32 days and the display is shown in hours and minutes.
Daily run times
The run times of the compressors are recorded daily and stored with date and time. The cycle time starts at
midnight. For the pack controller, the daily compressor run times are recorded separately for the first setpoint
(menu 6-4-2/6-5-2) and the second setpoint (menu 6-4-3/6-5-3).
Switch-on pulses
The switch-on pulses of the compressors are recorded daily and stored with date and time. The cycle time
starts at midnight. For the pack controller, the daily compressor switch-on pulses are recorded separately for
the first setpoint (menu 6-4-5/6-5-5) and the second setpoint (menu 6-4-6/6-5-6).
Activity
The activity (utilisation) is calculated according to the following formula and displayed in percent.
Activity: activity (utilisation) of compressor pack
L: total of all compressor run time
s: number of compressors installed
T : current time
1
T : day change
0
4.13.3 Actual value archives for the graphical display
Important key performance indicators for the pack controllers are archived in the system centre. This includes
archives for current values, 1 hour average values and 24 hour average values.
The archiving period differs for each of these archives. After this archiving period has elapsed, the oldest