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Manage operating envelope
Test N°
Purpose
Check reaction
1
of system to oil
boost
Multiple envelope control: Speed range <3000 allowed
Controller needs to manage speed limitation
according to operating conditions.
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 1800
*for more details see "Control Logic"
Test condition
Stabilized the system in area below
minimum speed (2400RPM) until oil
boost happen
Below 2400RPM oil boost function is disabled
by default but could be enabled by OEM (more
details "Oil management logic")
See "Test, criteria and solutions"
Condensing pressure control
Pass criteria
No unsafties happen
Superheat requirement fulfilled
HP switch setting
3000-6600RPM
1800-6600RPM
Solutions
Modify ramp-up
Modify superheat control
AB444226142054en-000101
OE-000067
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