Active Envelope Protection - Emerson EV3 Series Application Manuallines

1: High-Speed Envelope Protection
▪ Overload Protection enabled.
▪ Normal Operation: the minimum speed is the minimum speed of the envelope. Value taken from
the EEPROM and updated frequently based on the operating point. The user must take care to
run the compressor within the envelope at all times.
▪ SDP mode: the minimum speed is the speed available for the whole envelope. Taken from the
EEPROM and stored in register [109].
▪ In this mode, besides the speed demand, the user must send the minimum speed for each
operating point.
2: Advanced Speed-Drop Protection Mode
▪ Overload Protection enabled.
▪ Normal Operation: the minimum speed is the minimum speed of the envelope. The value is stored
and updated frequently in register [109].
▪ SDP mode: the speed at which the drive drops is the minimum speed of the envelope. The value
is stored and updated frequently in register [109].
▪ In this mode, besides the speed demand, the user must also provide the minimum speed
depending on the operating point for the Normal Operation and SDP modes in register [109].

4.4.2 Active Envelope Protection

The Active Envelope Control (selectable via register [231], mode 3) comprises of two stages:
Stage I: Out-of-maximum application envelope detection
The drive receives the evaporating and condensing temperatures via Modbus from the system
controller. Then it checks whether the operating point is within the envelope. If the operating point is
out of the envelope for 30 seconds an alarm is sent to the system controller.
If the compressor is not running inside the envelope, the drive acts differently based on the region in
which the running point is. The outer part of the envelope is spread into two parts: the grey zone
below the envelope and the white zone. This particular feature is based on the different behaviour of
the installation during start-up. In this way the compressor is allowed to run below the envelope
during start-up and defrost, until the setpoint stabilizes within the envelope.
Figure 6: Application envelope of ZPV0962E with R410A (20°F SH, 15°F SC, 95°F ambient)
White zone:
▪ Speed range: 2600-6000 rpm
▪ Allowed running time: 30 seconds
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