FEC AFC1200 - Manual (Page 23)

)(& ,QF
6.6 Current Monitoring
The current monitoring function works as a redundant protection for the torque preamplifier
operations. By sensing the current drawn by the motor, the system can establish an alternate
reference to the signals generated by the torque preamplifier. It is intended to detect hidden
problems not trapped neither by the torque transducer nor by the angle encoder, like wrong
calibration values, failures in the tool transmission, deffective torque transducers, etc.
This function allows the operator to set limits for low current, high current, low current warning
and high current warning. When the system reaches the peak torque torque or final angle
values and the motor current overrides the high current limit or does not achieve the low
current limit, an Abnormal signal is generated and the System is halted. If the current drawn
by the motor overrides the high warning limit or does not achieve the low warning limit, the
System activates the Current Warning Output Signal, without halting the System's operation.
This current warning signal prompts for a potential failure in the system, that requires to be
inspected.
FIG. 6.6: Current monitoring parameters
Hi limit current limit. Set to trigger the warning alarm. CURRENT WARNING LOW LIMIT
Hi limit current limit. Set to trigger the warning alarm. CURRENT WARNING HI LIMIT
Maximum current allowed to perform the Final Torque. CURRENT LOW LIMIT
Minimum current allowed to perform the Final torque. It is
determined experimentally by analyzing data from acceptable
parts. CURRENT HI LIMIT
RECOMMENDATION FUNCTION
Chapter 6: Fastening Instructions
Page 6-23
HI CURRENT
HI WARNING
LOW WARNING
LOW CURRENT
TIME/ANGLE
CURRENT