KB Electronics KBWT-210 - Manual (Page 5)

KBWT Series Installation and Operation Instructions (A40130) – Rev. B00 – 5/29/2013
Page 5 of 7
4 SELECTABLE JUMPER J1
The drive contains a Potentiometer Safety Circuit (PSC). When power is applied to
the drive the signal input must first be set to zero: the Main Speed Potentiometer
must be set fully counterclockwise, or the analog signal must be set to 0 Volts DC,
or the PWM signal must be set to 0 Volts DC. Then increase the signal to the
desired setting to control motor speed.
Jumper J1 is factory set to the "PSC" position, to enable the Potentiometer Safety Circuit. To disable the
Potentiometer Safety Circuit, set Jumper J1 to the "NPSC" position. See Figure 9. See Figure 2, on page 3, for
the location of Jumper J1.
5 DIAGNOSTIC INDICATORS
Two diagnostic LEDs are provided to indicate the drive's operational status. See Figure 2, on page 3, for the
location of the LEDs.
5.1 Power ON (PWR): The PWR LED will illuminate green when AC line is applied to the drive.
5.2 Overload (OL): When the motor is loaded to the Current Limit (CL) set point (established by the CL Trimpot
setting), the OL LED will illuminate red. If the drive is allowed to stay in CL and then "times out" in Timed Current
Limit (TCL), the OL LED will remain illuminated until the drive is restarted (either by an On/Off AC Line Switch or
with the Inhibit Switch). If the OL LED remains illuminated during normal drive operation, a fault condition may
exist. On cyclical loads, it may be normal for the CL LED to momentarily flash.
6 ADJUSTABLE TRIMPOTS
The drive contains trimpots which have been factory set for most applications. Figure 2, on page 3, illustrates the
location of the trimpots and their approximate factory settings. Some applications may require readjustment of the
trimpots in order to tailor the drive for a specific requirement. See Figures 10 – 15, for the trimpot ranges.
WARNING! If possible, do not adjust trimpots with the main power applied. If adjustments are
made with the main power applied, an isolated adjustment tool must be used and safety glasses must be
worn. High voltage exists in this control. Electrocution can result if caution is not exercised. The Safety
Warning, on page 7, must be read and understood before proceeding.
FIGURE 10
CL TRIMPOT
RANGE
(% FULL LOAD)
FIGURE 11
IR TRIMPOT
RANGE
(VOLTS DC)
FIGURE 12
MAX TRIMPOT
RANGE
(% BASE SPEED)
FIGURE 13
MIN TRIMPOT
RANGE
(% BASE SPEED)
FIGURE 14
ACCEL TRIMPOT
RANGE
(SECONDS)
FIGURE 15
DECEL TRIMPOT
RANGE
(SECONDS)
200 0
150
15 0
3, 6
50
100
30 0 12 0.2
2
12 0.2
2
6.1 Current Limit Trimpot (CL): The CL Trimpot sets the current limit (overload), which limits the maximum
current (torque) to the motor. The CL also limits the AC line inrush current to a safe level during startup. The CL
Trimpot is factory set to 1.5 times the full load rating of the drive. To increase the current limit, rotate the CL
Trimpot clockwise (do not exceed 2 times motor current rating (maximum clockwise position)). To decrease
the current limit, rotate the CL Trimpot counterclockwise. See Figure 10, above.
Note: On cyclical loads, it may be normal for the CL LED to momentarily flash.
FIGURE 9
JUMPER JI SETTINGS
Jumper J1 Set to
"PSC" Position
(Factory setting)
Jumper J1 Set to
"NPSC" Position