Power Failure - Brainchild P41 User Manual

4-8 Power failure

4-8 Power failure
If power is lost and then restored, while a profile is running, the behavior of
the profile is determined by the setting of the parameter " PFR " power fail
recovery in profile configuration. This can have one of 4 settings -
, and
the profile continues from where it was interrupted when power was lost.
The parameters such as set point value ( SV ), time remaining ( TIME ) and
cycle remaining ( CYCL ) will be restored to their power-down values. For
application that need to bring the process value to the set point value as
soon as possible, this is the best choice. The two diagrams below illustrate
the respective responses, Fig. 4.3 if power fails during a dwell segment and
Fig. 4.4 if it fails during a ramp segment.
Set point Set point
Ramp
Segment
Figure 4.3 Recovery from profile at dwell segment Figure 4.3 Recovery from profile at dwell segment
Set point Set point
power off power off
Ramp Segment Dwell Segment
Figure 4.4 Recovery from profile at ramp segment Figure 4.4 Recovery from profile at ramp segment
. If
Segment dwell Segment dwell
time = t1+t2 time = t1+t2
t1
power off power off
Dwell
Segment
Target Set point Target Set point
is selected, then when power is restored
t2
power on power on
Time
power on power on
UM0P411A
Time
,
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