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7
SECUENCIA DE ARRANQUE
7.1
Diagramas de flujo de puesta en marcha y parada
La puesta en marcha y la parada de la unidad seguirá la secuencia que se muestra en las figs.
17 y 18.
Compressors loading
Compressor Trip
No
Alarm delay timer
expired
Compressor Trip
Control requires unit
loading
No
New Compressor start
required
(see loading table)
Yes
New Compressors
selection
Compressor line
contactor closing
No
Transition confirmation
within 10 sec
Yes
Compressor complete
unloading
Prepurge procedure
No
Pressure ratio exceeds
minimum load limit
Yes
Compressor enabled to
load
Yes
Fig. 17 - Secuencia de arranque de la unidad
Unit Start
Evap pump start
No
Evap flow switch
consensus within timer
Unit Trip
expiration
Yes
Temperature control
start
Temperature control
stabilitation
Compressors start
enabled
Control requires unit
Control requires unit
standby
Compressor stop
Compressors standby
(see unloading table)
Compressor complete
Pumpdown procedure
Compressor line
contactor opening
unloading
No
required
Yes
Compressors unloading
unloading
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