Rockwell Automation 20B PowerFlex 70, PowerFlex 700 Reference Manual - Manual (Page 18)

Analog Inputs
18 Rockwell Automation Publication PFLEX-RM001H-EN-P - June 2013
While the process is normal and running from the analog input, everything
proceeds normally. However, if the wire for the analog input should be severed or
the sensor malfunction so that the 4-20mA signal is lost, the following sequence
occurs:
1. The drive will sense the signal loss.
2. An active Type 1 Alarm is created and the last signal value is maintained as the
speed reference.
3. The alarm activates the digital output relay to light the alarm light for the
operator.
4. The operator uses the HIM to switch the drive to Manual Control (see Auto/
Manual).
5. The operator manually brings the process to a controlled stop until the signal
loss is repaired.
Alarm Queue (PowerFlex 700 Only)
A queue of 8 parameters exists that capture the drive alarms as they occur. A
sequential record of the alarm occurrences allows the user to view the history of
the eight most recent events.
Analog Inputs Possible Uses of Analog Inputs
The analog inputs provide data that can be used for the following purposes:
•
Provide a value to [Speed Ref A] or [Speed Ref B].
•
Provide a trim signal to [Speed Ref A] or [Speed Ref B].
•
Provide a reference when the terminal block has assumed manual control of
the reference
•
Provide the reference and feedback for the PI loop. See Process PI Loop on
page 135 .
•
Provide an external and adjustable value for the current limit and DC braking
level
•
Enter and exit sleep mode.
•
Provide a value to [Torque Ref A] or [Torque Ref B].
U
T
IL
ITY
Al
arm
s
262
263
264
265
266
267
268
269 [Alarm 1 Code]
[Alarm 2 Code]
[Alarm 3 Code]
[Alarm 4 Code]
[Alarm 5 Code]
[Alarm 6 Code]
[Alarm 7 Code]
[Alarm 8 Code]
A code that represents a drive alarm. The codes will
appear in the order they occur (first 4 alarms in – first 4
out alarm queue). A time stamp is not available with
alarms.
Default:
Min/Max:
Display:
Read Only
0/256
1
261
Vector FV