Carel UltraCella - Page 50

50
ENG
UltraCella +0300083EN - rel. 1.5 - 07.02.2015
D
D
OFF
rd/2
St
Sv
rd/2
CP1
CP2
ON
OFF
ON
Fig. 6.t
Key
SV Virtual probe
CP1 Compressor 1
t time
CP2 Compressor 2
rd Diff erential
St Set point
Operation examples: (NOTE: REQ1: Sv > St + rd/2; REQ2: Sv > St + rd)
t
t
t
t
Example 1
CP2
OFF
ON
CP1
OFF
ON
REQ2
OFF
ON
REQ1
OFF
ON
Fig. 6.u
Example 2
t
t
t
t
CP2
OFF
ON
CP1
OFF
ON
REQ2
OFF
ON
REQ1
OFF
ON
Fig. 6.v
Example 3
t
t
t
t
CP2
OFF
ON
CP1
OFF
ON
REQ2
OFF
ON
REQ1
OFF
ON
Fig. 6.w
Example 4
t
t
t
t
CP2
OFF
ON
CP1
OFF
ON
REQ2
OFF
ON
REQ1
OFF
ON
Fig. 6.x
Key
REQ1 request 1
REQ2 request 2
t time
CP1 compressor 1
CP2 compressor 2