Compressor Start-Up And Shutdown Profile - Emerson COPELAND EVA3 Bulletin

Compressor Start-up and Shutdown Profile

The EVA3 drives incorporate a specific startup profile when starting the compressor. This profile is
configurable, see the Drive Configuration section for more details. Figure 1 and Table 1 correspond to the
compressor startup profile, while Figure 2 and Table 2 correspond to the compressor shutdown profile.
Stage Description
Drive receives valid
I compressor speed
demand.
Compressor dwell
II
speed.
Compressor
reaches demanded
III
speed.
Stage Description
Drive receives compressor speed
I demand of 0 (controlled shutdown
request).
II Compressor reaches minimum speed.
III Compressor has stopped.
1
This speed may vary based on compressor selected.
Emerson Classification: Internal
14
© 2023 Emerson Climate Technologies, Inc.
Table 1 – Compressor Startup Sequence
Target Speed Ramp Up Rate
(rpm)
1800
Default: 3600
(Configurable)
Default: 200
Demanded
Speed
(Configurable)
Table 2 – Compressor Shutdown Sequence
Ramp Down
(rpm/s) Rate (rpm/s)
1600 -
- -
Default: 200
(Configurable)
Target Speed Ramp Down Rate
(rpm)
-
900 1
(Configurable)
-
AE8-1435
Duration (s)
4
Default: 10
(Configurable)
(rpm/s)
-
Default: 200
-