Franklin Electric CERUS X-DRIVE CXD-003A-4V, Инструкция по установке и эксплуатации, Страница: 93 / 252

OPERATION
Protection Features
93
Fine Tune Settings for HLD by Torque
1. Verify accuracy of
Motor FLA (SFA) [SET–03]
,
Motor Voltage [SET–05]
, and
VFD Base Freq [VFD–02]
. These values
determine nominal torque.
2. Adjust
HLD Frequency [SET–49]
to be equal to minimum operational frequency
Low Freq Limit [SET–13]
or
PID Lo Hz Limit [SET–22] .
3. Run motor at minimum frequency and verify water movement for pump or air movement for fans.
4. While running the motor at minimum frequency, determine whether VFD trips on HLD:
• If system trips on HLD using default
HLD Level [SET–48]
, increase level by 3% until system does not
trip.
• If system does NOT trip using default
HLD Level [SET–48]
, decrease the level by increments of 3% until
system trips, then increase back by 3%.
5. If nuisance tripping occurs, increase
HLD Min Torque [PROT–58]
by increments of 1%.
6. Adjust HLD Delay [SET–50] to duration acceptable for operation.
Underload Protection (Dry Well or Belt Loss)
Underload Detection (ULD) monitors motor current and frequency to protect against conditions such as a
dry well, broken pump, or broken drive belt. Two options are available:
•
ULD by Current: The VFD trips when current reading is less
than set value and speed is equal to or greater than set
value, the VFD will trip on ULD.
• ULD by Torque: The VFD calculates an Underload Torque
Limit curve across the full frequency range based on motor
parameters, VFD Base Frequency, and ULD settings. The
VFD then trips when torque falls below this curve with fre
-
quency equal to or greater than
ULD Freq [SET-43]
for a dura -
tion of ULD Delay [SET-44] . 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 Underload Protection, adjust the following parameters:
Prime Time [IO–39]: Some pump applications require time for the pump to self-prime before the load sta -
bilizes. This setting adds a 0 to 6000 second delay before the VFD starts monitoring for Underload or No-
Flow conditions, which protects against nuisance faults. The delay operates at any VFD start, in both Hand
and Auto modes, including Run, Wake, Restart, or Reset commands.
ULD Select [SET–41]:
0_Disable
,
1_By Current
, or
2_By Torque
.
ULD Min Torque [PROT–57]: If using ULD by Torque, set minimum torque level percentage at 0 Hz. Default
is 10%.
ULD Level [SET–42]: For ULD by Current, set as a percentage of motor FLA (SFA) (default is 45%). For ULD
by Torque, set as a percentage of nominal torque at base frequency. If all conditions are met, VFD will trip
below this level.
ULD Frequency [SET–43]: Set minimum frequency for ULD by Current or Torque detection.
ULD Delay [SET–44]: Range = 1 to 360 seconds (default = 2 sec). When timer expires, if current is still
below
ULD Level [SET–42]
or torque is still below ULD Torque Limit curve and frequency is still above
ULD Fre -
quency [SET–43] , VFD will trip based on ULD Select [SET–41] .
ULD Recovery Time [SET–45]: 0 to 720 min (default is 30 min). If timer is set to value greater than 0 min -
utes, VFD will restart after timer expires. If set to 0 and the VFD trips, manual or remote reset is required (no
auto retries).
For dry well protection,
ULD Recovery T [SET-45] should be long enough to allow the well to be filled. If VFD trips
the first time on Underload, it will restart after the Recovery timer expires. If VFD trips again, the timer value
Nominal Torque Percent
Nominal Torque
Load
Underload Torque
Limit
Base Freq [VFD-02] ULD Freq [SET-43]
ULD Level [SET-42]
ULD Min [PROT-57]
Nominal Torque 100%