Baldor SERIES 5, Installation And Operating Manual, Page: 27 / 32

27
If the motor is overloaded to 120% of full load (75% of the CL setting), the I
2
t Timer
starts. If the motor continues to be overloaded at the 120% level, the timer will shut
down the drive after 30 minutes. If the motor is overloaded to 160% of full load, the
drive will trip in 6 seconds.
*UL approved as an overload protector for motors.
8.2 Start-Up Procedure: After the drive
has been properly setup (jumpers
and trimpots set to the desired
positions) and connections com-
pleted, the power (PWR) LED will
be illuminated green. The status
(ST) LED will indicate drive status,
as described in Table 10. To
remove and install the Finger-Safe
Cover, see Section 4, on page 14.
8.3 Fault Recovery: The drive moni-
tors four faults (Undervoltage,
Overvoltage, Short Circuit at the
motor (phase-to-phase), I
2
t).
Table 11 describes how the drive
will automatically start (factory
setting) after the fault has cleared.
Application Note – In Manual Start
Mode, the drive must be manually
reset for any fault. Use the Manual
Start Switch, as described in
Section 5.6, on pages 18 and 19.
8.4 Restarting the Drive After an I
2
t
Fault Has Cleared: The drive can
be restarted after an I
2
t Fault has
cleared by any of the following methods.
Note: If an I
2
t Fault occurs, the motor may be overloaded. Check the motor current with
an AC RMS responding ammeter. Also, the CL setting may be set too low. See Section
7.7, on page 25.
1. Disconnect and reconnect the AC power (approximately 15 seconds).
The “ST” LED must change from quick flashing red to flashing red/yellow.
2. Set the Main Speed Potentiometer to zero (fully counterclockwise).
Note: In order to be able to reset the drive by setting the Main Speed Potentiometer
to zero, it is necessary to have the MIN Trimpot set to zero (fully counterclockwise).
3. Open and close the Enable switch or contact. See Section 5.8, on pages 19 and 20.
TABLE 11 – FAULT RECOVERY & RESETTING THE DRIVE*
Fault Automatic Start Mode (Factory Setting)
Undervoltage
Drive will automatically start
after the bus voltage returns to the operational level
or when the drive is first turned on (power up).
Overvoltage
Drive will automatically start
after the bus voltage returns to the operational level.
Short Circuit
Drive will automatically start
after the short circuit is removed.
I
2
t
Drive must be manually restarted .
*The fault must be cleared before the drive can be reset.
Notes: 1. Slow Flash = 1 second on and 1 second off. Quick Flash = 0.25
second on and 0.25 second off. 2. In Manual Start Mode, when the Overload
is removed, before the I
2
t times out and trips the drive, the “ST” LED will
flash green. 3. In Manual Start Mode, when the Undervoltage or Overvoltage
condition is corrected, the “ST” LED will flash Red / Yellow / Green.
TABLE 10 – DRIVE OPERATING CONDITION &
STATUS LED INDICATOR
Drive Operating Condition
Flash Rate
1
and LED Color
Normal Operation (Run) Slow Flash Green
Overload (120% – 160% Full Load)
Steady Red
2
I
2
t (Drive Timed Out)
Quick Flash Red
Short Circuit Slow Flash: Red
Undervoltage
Quick Flash Red / Yellow
3
Overvoltage
Slow Flash Red / Yellow
3
Stop Steady Yellow