Emerson FXMP25 User Manual page 51

Figure 7-3 Mentor II mode
Drive healthy
flux level
25
Field
flux
output
A1/A2 If
Refer to Mentor II User Guide Issue 14 page 95 for Mentor II block diagram.
Thermal overload in Mentor II mode works by forcing current feedback to zero causing
the relay to operate. When Mentor II is enabled, this causes the drive to trip FdL (field
loss). When in the disabled state, FdL trip is not active on Mentor II, and therefore
following loss of feedback Mentor II will advance the firing angle to the end stop which
WARNING
will cause the output of the FXMP to reach maximum voltage set by the front end stop
Pr 6.21.
When using FXMP 25 with Mentor II, Pr 6.21 must be set in order to avoid field over
voltage conditions during fault conditions. (Refer to Pr 6.21 on page 64 in the Mentor II
User Guide for an example calculation). FXMP relay and Mentor II logic functions
should be used to set Pr 6.13 to 0 to disable firing pulses during fault conditions in the
disabled state.
FXMP25 User Guide
Issue Number: 3
Drive healthy
hysteresis level
26
exceeded
Field flux
07
output scaling
www.controltechniques.com
Drive
01
healthy / OK
Flux
level
27
OR
Flux
54
feedback
Flux calculator
Mentor II field
11
feedback setting
56
Field
current
feedback
8
F
A
I
9
L
10
51