BENSHAW RSi H2P Series, Instruction Manual

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890053-02-00
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19
Lost Feedback and High Feedback Settings
The Lead/Lag macro includes functions to monitor the feedback signal and detect both a lost (or low) feedback
signal and a high feedback signal. The default settings for both when exceeded cause a latched fault which may
not be appropriate for all applications. Both can be set to disable the fault. Also, both if faulted, can be auto reset
with protection parameters PRT-09 and PRT-10.
19.1
Lost Feedback
Parameter Name LCD Display Setting Range Default
AP2-55 Lost Feedback Mode Lost Fdb Mode
0 None
2 Free-Run
1 Warning
2 Free-Run
3 Dec
AP2-56 Lost Feedback Time Lost Fdb Time
0.1 ~ 120.0 (secs)
20.0
AP2-57 Lost Feedback Level Lost Fdb Level
-100% ~ +100% of PID-53
1.0 % of PID-53
The Lost Feedback Mode (AP2-55) can be set to None, (disabled) or to provide a Warning or to Trip when the
feedback falls below the Lost Feedback Level (AP2-57) for the Lost Feedback Time (AP2-56). When set to Warning,
the LCD will flash “Lost Fdb Level” but will not trip the drive. When set to Free-Run or Decel, the drive will trip and
stop (coast or decelerate). “Lost Fdb Level” also flashes on the LCD display. The Lost Feedback Level (AP2-57) is
in PID Units (PSI) and the default setting is 1.0 % of the maximum transducer value set in MC2-37 (PID-53).
Example: MC2-37 (PID-53) maximum value of transducer is 100 PSI. AP2-57 defaults to 1.0 PSI for Lost Feedback
Level detection.
When a trip occurs (setting of Free-Run or Decel), the drive will stay in a faulted condition if the feedback signal
remains below the Lost Feedback Level (AP2-57). If the feedback signal increases above the Lost Feedback Level
(AP2-57), the drive will perform Auto fault resets/restarts based on the settings of PRT-09 (Retry Number) and PRT-
10 (Retry Delay) time. The default settings for PRT-09 and PRT-10 are Retry 3 times every 5 seconds. If the fault
is reset, the drive resumes operation. Also, when a trip occurs, any output relay set to the “Trip” function will activate.
19.2
High Feedback
The High Feedback default settings cause a trip when the feedback signal exceeds the High Feedback Level AP2-
54 (High Fdb Level) for the High Feedback Time AP2-53 (High Fdb Time). “High Fdb Level” flashes on the LCD.
The High Feedback Level (AP2-54) is in PID Units (PSI) and the default setting is 90 % of the maximum transducer
value set in MC2-37 (PID-53).
Parameter Name LCD Display Setting Range Default
AP2-53
High Feedback Time High Fdb Time 0.0 – 1200.0 (sec) 100.0
AP2-54
High Feedback Level High Fdb Level -100% ~ +100% of PID-53 90% of PID-53
When a trip occurs, the drive will stay in a faulted condition if the feedback signal remains above the High Feedback
Level (AP2-54). If the feedback signal decreases below the High Feedback Level (AP2-54), the drive will perform
Auto fault resets/restarts based on the settings of PRT-09 (Retry Number) and PRT-10 (Retry Delay) time. The
default settings for PRT-09 and PRT-10 are Retry 3 times every 5 seconds. If the fault is reset, the drive will resume
operation when the feedback level decreases below the setpoint. Also, when a trip occurs, any output relay set to
the “Trip” function will activate.
To disable the High Feedback Level fault, set AP2-54 to 0.00 (PID Units).