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Compressor Information
Oil return management
–
Insufficient lubrication can be the result of oil depositing itself in pipes and
bends. Return management helps oil deposits to return to the crankcase by:
• Increasing velocity for short periods at regular time intervals.
• Providing adequate oil return when velocity is too low.
Figure 26 - Sight Glass
Timed oil boost
– Returns oil from the system to the compressor for a
defined time period. To set the oil boost configuration, go to
Factory
Settings > Compressor Config > Oil Boost Time
. The user can set
the time OFF or configure a time setting between 1-120 minutes. Default
is set to 60 minutes. When the system is in an oil boost, the boost will
last for 1 minute, and an “O” will be displayed on the HMI.
Oil level
–When the compressor is running and in a stabilized condition,
the oil level should be visible in the sight glass window, see
.
The presence of small bubbles and foam indicates there could be a
large concentration of refrigerant in the oil, or there may be liquid
returning to the compressor.
VZH 044/035/028
When the system has been running low on oil at a low RPM, less than 3000 RPM (100 Hz) for 19 minutes,
the internal lubrication algorithm in the drive will accelerate the compressor. The compressor will
accelerate to 4200 RPM (140 Hz) for 60 seconds. This will make sure there is sufficient lubrication of the
compressor’s moving parts.
When “Hands On” mode is selected, the oil return management will not be
active, even if the parameter is set to be on. If the compressor does run below 3000 RPM (100 Hz) for 19
minutes, an error will occur, and the compressor will shut down. The minimum/maximum speed for the
compressor is 1500 RPM (50 Hz)/6000 RPM (200Hz).
Oil level sensor
– This sensor is an optical sensor that monitors the compressor’s internal oil level. The
sensor will send a signal to the VFD controller. A warning will be displayed on the HMI if a low oil level
condition exists. If the oil level is low, the system will enter a secondary oil boost. If the oil level is still low
after this boost cycle, the system will shut down and display a fault.
If the oil level is low, add oil as necessary when the compressor is idle. Use PVE oil from new containers.
DO NOT CONTAMINATE THE OIL
. Connect an oil hand pump to the Schrader valve connection on the
compressor. Add oil until the level fills 50-75% of the sight glass after the unit has been off for at least 5
minutes.
Compressor VZH 065
When the system has been running low on oil at a low RPM, less than 2400 RPM (80 Hz) for 19 minutes,
the internal lubrication algorithm in the drive will accelerate the compressor. The compressor will
accelerate to 3600 RPM (120 Hz) for 60 seconds. This will make sure there is sufficient lubrication of the
compressor’s moving parts. When “Hands On” mode is selected, the oil return management will not be
active, even if the parameter is set to be on. If the compressor does run below 2400 RPM (80 Hz) for 120
minutes, an error will occur, and the compressor will shut down. The minimum/maximum speed for the
compressor is 1000 RPM (50Hz)/6600 RPM (330Hz).
If the oil level is low, add oil as necessary when the compressor is idle. Use PVE oil from new containers.
DO NOT CONTAMINATE THE OIL
. Connect an oil hand pump to the Schrader valve connection on the
compressor. Add oil until the level fills 50-75% of the sight glass after the unit has been off for at least 5
minutes.
Sight Glass
