96
7.1.- Pump-Down (EVAP_10).
This function controls the shutdown of the last operating compressor stage.
Pump-Down starts when there is only one compressor operating. The shutdown of this stage takes place when:
This single stage operates for a period of time in excess of that defined by the user parameter
EVAP_11.
The suction pressure/temperature falls below the Pump-Down Set Point (
EVAP_12
).
7.- Other functionalities
Pevap (bar)
Tevap (ºC)
No. ACTIVE
STAGES
ALL
LAST
STAGE
Timer
(Secs)
Timer
(Secs)
EVAP_11
Case 1: Shutdown due
to PUMP
DOWN SP
EVAP_11
Case 2: Shutdown due to time
EVAP_12 (PUMP-DOWN. SP)
EVAP_8
EVAP_6
EVAP_1 (EVAP SP)
EVAP_1 - EVAP_7
EVAP_1 - EVAP_9
t
t
t
t
The graphs above show the two shutdown modes. In case 1, the final stage is shutdown when the evaporation
pressure/temperature falls below the Set Point for Pump-Down (
EVAP_12
), even though the interval defined
by the parameter
EVAP_11
has not been exceeded.
On the other hand, the last compressor shuts down in case 2 because the time is exceeded.
we make it easy
Содержание AKO-21006
Страница 20: ...20 The digital inputs and outputs from the above example are connected as follows B A B a a we make it easy...
Страница 104: ...104 A 5 Physical dimensions AKO 21801 AKO 21802 AKO 21803 67 mm 52 mm 51 mm 280 mm 90 mm DUOVision we make it easy...
Страница 117: ...NOTES 117 we make it easy...
Страница 118: ...118 NOTES we make it easy...
Страница 119: ...NOTES 119 we make it easy...
