Rockwell Automation GV3000/SE AC Gen. Purpose and Vector Drive Software Start-Up and Ref. Manual - Manual (Page 121)

Programming Reference 4-35
P.031 to P.038 Preset Speed 1 through Preset Speed 8 (continued)
The encoder loss detection diagnostic is functional only when the drive is operating as
a speed regulator (not as a torque regulator).
When the diagnostic is enabled and feedback from the encoder is not detected, a
drive fault will be logged (EL will be displayed).
If the encoder fails, loss will be detected down to 1 RPM. If only one of the quadrature
feedback wires is disconnected, loss may not be detected below 15 RPM.
Figure 4.6 – Typical Preset Operation
P.039 Encoder Loss Enable
This parameter
enables the encoder
loss detection
diagnostic.
This diagnostic is
available for flux
vector control (FVC)
only.
Parameter Range: OFF = Disable encoder loss diagnostic
ON = Enable encoder loss diagnostic
Default Setting: OFF
Parameter Type: Tunable
Refer also to parameters: N/A
&ORVHG
5XQ DQG 6WDUW
&ORVHG &ORVHG &ORVHG &ORVHG
'LJLWDO ,Q 
7HUP  &ORVHG &ORVHG
'LJLWDO ,Q 
7HUP 
&ORVHG
'LJLWDO ,Q 
7HUP 
3
3UHVHW 
RU 76
$QDORJ LQ
3
3
3
3
3
3
3