KB Electronics KBAC-29 (1P) - Manual (Page 22)

9 DRIVE OPERATION
9.1 START-UP PROCEDURE – After the drive has been properly setup (jumpers and trimpots set to the
desired positions) and wiring completed, the start-up procedure can begin. If the AC power has been
properly brought to the drive, the power (PWR) LED will illuminate green. The status (ST) LED will
indicate drive status, as described in Section 11.2.
To start the drive, momentarily set the Start/Stop Switch to the “START” position. The motor will begin
to accelerate to the set speed.
WARNING! Using a jumper to eliminate the start/stop function will cause the motor to run at the
Main Speed Potentiometer setting when the AC line is applied. See Section 9.2.
Note: If the motor rotates in the incorrect direction, it will be necessary to disconnect the AC line,
reverse any two motor leads, and repeat the start-up procedure.
9.2 STARTING THE DRIVE AFTER A FAULT HAS BEEN CLEARED 1, 2 – The drive monitors four faults
(Undervoltage, Overvoltage, Short Circuit (at the motor (phase-to-phase)), and Overload). See Section
11.2 for the Status (ST) LED indication. Also see Section 6.3, on page 17, for Automatic Ride-
Through or Manual Restart selection with Jumper J3.
To start the drive after a fault has been cleared, use the Start/Stop Switch 2, 3 .
If the Start/Stop Switch has been eliminated (bypassed), see Section 5.6, on page 15. 4 The drive can
be started (after the fault has been cleared), by disconnecting the AC power until all LEDs are no
longer illuminated and then reconnecting the AC power.
Notes: 1. For an Overload Fault, be sure the fault has been cleared before restarting the drive. Check
the motor current with an AC RMS responding ammeter. Also, the CL setting may be set too low. See
Section 12.7, on page 24. 2. For an Overvoltage Fault, if the drive is set for Automatic Ride-Through,
the drive will automatically restart when the AC line voltage returns to below the specified Overvoltage
Trip Point. 3. If the Forward-Stop-Reverse Switch has been installed, it can be used to restart the
drive. 4. If the Start/Stop Switch has been eliminated (bypassed), the AC line must be used to start
the drive after an Overload Fault has been cleared.
10 AC LINE FUSING
The drive does not contain line fuses. Most electrical codes require that each ungrounded conductor con-
tain circuit protection. Do not fuse neutral or ground connections. It is recommended to install a fuse
(Littelfuse 312 / 314, Buss ABC, or equivalent) or a circuit breaker in series with each ungrounded conduc-
tor. Do not fuse motor leads. For the recommended fuse size, see Table 4, on page 10.
Wire the drive in accordance with the National Electrical Code requirements and other local codes that may
apply to the application.
11 DIAGNOSTIC LEDS
The drive contains two diagnostic LEDs mounted on the enclosure cover to display the drive’s
operational status.
11.1 POWER ON LED (PWR) – The “PWR” LED will illuminate green when the AC line is applied
to the drive.
WARNING! Do not depend on the PWR LED as a guaranteed power off condition.
Be sure the main power switch or circuit breaker is in the “OFF” position before
servicing this drive.
11.2 STATUS LED (ST) – The “ST” LED is a tricolor LED which provides indication of a fault or abnormal
condition. The information provided can be used to diagnose an installation problem such as incorrect
input voltage, overload condition, and drive output miswiring. It also provides a signal which informs
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