GENER
AL INFORMA
TION
PR
ODUC
T INFORMA
TION
SY
STEM DESIGN
INTEGR
ATION INT
O SY
STEM
ORDERING INFORMA
TION
Protection required
• HP switch*
• LP switch*
• DGT set @ 135°C (275°F) if necessary
see §Discharge T° protection
•Measurements of suction and discharge pressure,
unit controller is permanently maintaining compressor
within its envelope
with right minimum speed
•drive setting:
parameter 4-11[ Motor speed low limit(rpm)]: keep
default value as 1000
See “Test, criteria and solutions”
HP switch
LP swit
ch
MOP c
on
tr
ol
Condensing pressure control
1000-6600rpm
1800-6600rpm
4200-6000r
pm
2400-6000rpm
Minimum pr
essur
e r
atio
DGT
Multiple envelope control: Speed range <2400 allowed
Test N°
Purpose
Test condition
Pass criteria
Solutions
1
Check reaction
of system to oil
boost
Stabilized the system in area below
minimum speed (2400RPM) until oil
boost happen
No unsafties happen
Superheat requirement fullfilled
Modify ramp-up
Modify superheat control
Manage operating envelope
Controller needs to manage speed limitation
according to operating conditions.
1000RPM to 1800RPM is allowed in area 1.1
1800RPM to 2400RPM is allowed in area 1.1 and
1.2
2400RPM to 6000RPM is allowed in area 1.1; 1.2
and 1.3
4200RPM to 6000RPM is allowed in all area
Below 2400RPM oil boost function is enabled by
default (more details
“Oil management logic”
)
Perform oil boost test 1 described below
*for more details see “Control Logic”
SY
STEM DESIGN
34
AB237586440343en-000601