C6.2.27/0716-0219/E 21
6.13 Shut-off sound
Scroll compressors incorporate a device that minimizes reverse rotation. The residual momentary
reversal of the scrolls at shut-off will cause a clicking sound, but it is entirely normal and has no
effect on compressor durability.
6.14 Frequency
There is no general release of standard Copeland Scroll compressors for use with variable speed
AC drives. There are numerous issues that must be considered when applying Scroll compressors
with variable speed, including system design, inverter selection, and operating envelopes at
various conditions. Only frequencies from 50 Hz to 60 Hz are acceptable. Operation outside this
frequency range is possible but should not be done without specific Application Engineering
review. The voltage must vary proportionally to the frequency.
If the inverter can only deliver a maximum voltage of 400V, the amps will increase when the speed
is above 50 Hz, and this may give rise to nuisance tripping if operation is near the maximum power
limit and/or compressor discharge temperature limit.
6.15 Oil level
The oil level should be maintained at mid-point of the sight glass. If an oil regulator is used the
level should be set within the top half of the sight glass.
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