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Grey zone:
▪ Speed range: 2600-6000 rpm
▪ Allowed running time based on the evaporating temperature:
o if less than -15 °C: 15 minutes
o if more than -15 °C: 30 minutes
If the speed demand is less than 2600 rpm or more than 6000 rpm, the speed is increased or
decreased automatically to respect the speed range. The time and temperature thresholds are
readable through registers [318], [319], [320] and [321]. The time remaining for running outside of
the envelope is readable through register [47]. The DLT feature is enabled while Active Envelope
Protection is in place.
Stage II: Speed limits within an envelope sub-region
If the working point is within the envelope, the drive will limit the speed range of each sub-region of
the envelope (minimum speed stored in register [44] and maximum speed stored in register [45]).
The coordinates of the point are compared with several predefined lines, for a proper localization of
the sub-region.
If the compressor is running outside the allowed speed limits, a warning is given and the speed is
changed accordingly.
In case of Speed-Drop Protection, the drive may reduce the speed as low as the minimum allowed
speed for the envelope region.
Outside the qualified application envelope, the speed limits are restricted to the whole envelope
speed band, ie, 2600-6000 rpm.
There are 6 sub-regions in total, which can be identified in the envelopes as per Appendix 4.
4.5
Clearing faults
Faults can be cleared after 30 seconds. To do this, follow the steps below:
1)
Set Compressor Speed Demand to zero [101]
2)
Set Compressor Enable command to zero [100]
3)
Set Clear Fault command [103]
NOTE: Once a Clear Fault command is sent, faults will only be cleared if their triggering cause
is gone. The Clear Fault command remains active until the last remaining fault has been
cleared. If all the faults have been cleared, the Clear Fault command will automatically be
reset.
4.6
Compressor start-up
The start-up control is divided into four stages, considering the default values:
▪ Stage I: (~2 seconds) The compressor will run from 0 to 1500 rpm at a default acceleration rate
of 600 rpm/s.
▪ Stage II: (T1) The compressor continues to increase its speed from 1500 to 3600 rpm with an
acceleration rate of 1000 rpm/s.
▪ Stage III: (T2~120 seconds) The compressor will remain at 3600 rpm for 120 seconds. The speed
from region III is set to 3600 rpm by default, but it can be configured through register [213]. Also,
the time (default value = 120 seconds) is configurable via register [234].
▪ Stage IV: After 120 seconds, the compressor will reach the commanded speed by a default
acceleration/deceleration rate of 200 rpm/s. The acceleration and deceleration rates can be
changed by introducing different values into registers [211], [212] (the maximum allowed value is
600 rpm/s).
14
AGL_Sol_EV3_E_Rev_02
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