Franklin Electric CERUS X-DRIVE CXD-003A-4V, Installation And Operation Manual

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OPERATION
Protection Features
92
High Load Detection
High Load Detection (HLD) protects the VFD and equipment against damage from an over-torque condi -
tion. Two options are available:
• HLD by Current: The VFD trips when current is above HLD Level [SET-48] with frequency equal to or
greater than HLD Freq [SET-49] for a duration of HLD Delay [SET-50] .
• HLD by Torque: The VFD calculates a High Load Torque Limit curve across the full frequency range
based on motor parameters, VFD Base Frequency, and HLD settings. The VFD then trips when torque
rises above this curve with frequency equal to or greater than
HLD Freq [SET-49] for a duration of HLD Delay
[SET-50] . This feature is primarily used for centrifugal loads such as centrifugal pumps or fans. It is not
recommended for progressive cavity pumps or constant torque loads.
To enable High Load Detection, adjust the following parameters:
HLD Select [SET–47]: 0_Disabled , 1_By Current , or 2_By Torque .
HLD Min Torque [PROT–58]:
Only if using HLD by Torque, set minimum torque level percentage at 0 Hz.
Default = 10%.
HLD Level [SET–48]:
For HLD by Current, set as a percentage of motor FLA (SFA) (default = 110%). For HLD
by Torque, set as a percentage of nominal torque at base frequency. If all conditions are met, VFD will trip
above this level.
HLD Frequency [SET–49]: Set minimum frequency for HLD by Current or Torque detection.
HLD Delay [SET–50]:
Range = 0 to 360 seconds. When timer expires, if current or torque is still above limits
and frequency is still above [SET–49] , VFD will trip based on [SET–47] .
HLD Recovery Time [SET–51]:
0 to 720 min (default = 0 min). If timer is set to value greater than 0 minutes,
VFD will restart after timer expires. If set to 0 and the VFD trips, manual or remote reset is required (no auto
retries).
If the VFD trips the first time on high load, it will restart after the Recovery timer expires. If VFD trips again,
the timer value will be doubled. The VFD will continue restart attempts, doubling the timer value until it
reaches 720 minutes (12 hours). Then every restart will be in 720 min.
HLD Recover Cnt [SET–52] displays the
countdown before the next restart attempt.
When the VFD finally runs without tripping for 180 sec, the recovery timer will be reset to original setting
and at next high load trip VFD will wait for original
[SET–51] time value. If the run command is removed, or
HOA is set to OFF, the high load feature is canceled and the [SET–51] timer is reset to its original setting.
Nominal Torque Percent
High Load Torque Limit
Nominal Torque Load
Base Freq [VFD-02] HLD Freq [SET-49]
HLD Level [SET-48]
HLD Min [PROT-58]
Nominal Torque 100%