KB Electronics KBWS-25D - Manual (Page 18)

VII. OPERATION. (You must read the Safety Warning on page 5 before proceeding).
After the KBWS has been properly setup, the startup procedure can begin. If AC power
has been properly brought to the control, the PWR ON LED will illuminate green.
Before starting, be sure that the Main Speed Potentiometer is set to the zero speed
position. The motor should begin to run as the Main Speed Potentiometer is rotated
clockwise. Note: If the motor runs in the incorrect direction, it will be necessary to dis-
connect the AC line, reverse the motor leads and repeat the startup procedure.
VIII.FUSING
The KBWS does not contain fuses. Most electrical
codes require that each ungrounded AC line con-
ductor contain circuit protection. It is recommend-
ed to install a fuse or a circuit breaker in series with
each ungrounded conductor. Check all electrical
codes that apply to the application. See Table 4.
In order to protect the motor against overload, it is
recommended to install an armature fuse. The
fuse should be selected so that its Amp rating is 1.2
times the motor rating (Amps DC). An AC Line / Armature Fuse Kit is available (P/N
9849). Use Littelfuse 326, BUSS ABC or equivalent fuses (supplied separately).
IX. TRIMPOT ADJUSTMENTS
The KBWS contains trimpots which are factory set for most applications. Figure 1,
on page 8 illustrates the location of the trimpots and their approximate calibrated
positions. Some applications may require readjustment of the trimpots in order to
tailor the control for a specific requirement. Readjust trimpots as described below.
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TABLE 4 – RECOMMENDED
AC LINE FUSE
Application Note: This control is not recommended for applications where
the AC line is to be rapidly cycled on and off.
Model
Recommended AC
Line Fuse (Amps)
KBWS-12 5
KBWS-15 10
KBWS-22D 5
KBWS-25D 10