KB Electronics KBAC-29 (1P) User Manual

Page 23

12 TRIMPOT ADJUSTMENTS

The drive contains trimpots which are factory set for most applications.

See Figure 2, on page 9, for the location of the trimpots and their

approximate factory calibrated positions. Some applications may require

readjustment of the trimpots in order to tailor the drive for a specific

requirement. The trimpots may be readjusted as described below.

WARNING! If possible, do not adjust trimpots with the

main power applied. If adjustments are made with the

main power applied, an insulated adjustment tool must be used and

safety glasses must be worn. High voltage exists in this drive. Fire

and/or electrocution can result if caution is not exercised. Safety

Warning, on page 5, must be read and understood before

proceeding.

12.1 MINIMUM SPEED (MIN) – Sets the minimum speed of the

motor. The MIN Trimpot is factory set to 0% of frequency setting.

For a higher minimum speed setting, rotate the MIN Trimpot

clockwise. See Figure 30.

12.2 MAXIMUM SPEED (MAX) – Sets the maximum speed of the

motor. The MAX Trimpot is factory set to 100% of frequency set-

ting. For a lower maximum speed setting, rotate the MAX Trimpot

counterclockwise. For a higher maximum speed setting, rotate

the MAX Trimpot clockwise. See Figure 31.

12.3 ACCELERATION (ACCEL) – Sets the amount of time for the

motor to accelerate from zero speed to full speed. The ACCEL

Trimpot is factory set to 1.5 seconds. For a longer acceleration

time, rotate the ACCEL Trimpot clockwise. For more rapid

acceleration, rotate the ACCEL Trimpot counterclockwise.

See Figure 32.

Note: Rapid acceleration settings may cause the current limit circuit to activate, which will extend the

acceleration time.

the user that all drive and microcontroller operating parameters are normal. Table 7, summarizes the

“ST” LED functions.

Drive Operating Condition

Flash Rate

and LED Color

Normal Operation

Slow Flash Green

Overload (120% – 160% Full Load)

Steady Red

t (Drive Timed Out)

Quick Flash Red

Short Circuit

Slow Flash Red

Undervoltage

Quick Flash Red / Yellow

Overvoltage

Slow Flash Red / Yellow

Stop

Steady Yellow

Stand-By

Slow Flash Yellow

TABLE 7 – DRIVE OPERATING CONDITION AND STATUS LED INDICATOR

Notes: 1. Slow Flash = 1 second on and 1 second off. Quick Flash = 0.25 second on and 0.25 second off. 2. When the Overload is
removed, before the I

t times out and trips the drive, the “ST” LED will flash green. 3. When the Undervoltage or Overvoltage condition is

corrected, the “ST” LED will flash Red / Yellow / Green. 4. Only if the Forward-Stop-Reverse Switch is installed.

(Shown Factory Set to 0% Frequency Setting)

MIN

FIGURE 30 – MINIMUM SPEED

TRIMPOT RANGE

(Shown Factory Set to 100% Frequency Setting)

MAX

110

100

FIGURE 31 – MAXIMUM SPEED

TRIMPOT RANGE

0.3

(Shown Factory Set to 1.5 Seconds)

ACCEL

1.5

FIGURE 32 – ACCELERATION

TRIMPOT RANGE