KB Electronics KBMM-225D - Manual (Page 12)

4.3 Acceleration Start – The control contains an adjustable acceleration start feature which allows the motor to
smoothly accelerate from zero speed to full speed over a time period of 0.2 - 10 seconds. The acceleration
trimpot (ACCEL) is factory set for 2 seconds.
4.4 Limitation In Use – The control is designed for use on machine applications.
CAUTION! Consult our Sales Department before using this control on constant horsepower applica-
tions such as saws and drill presses. Do not use this control in an explosive atmosphere. Be sure the
control is used within its ratings. Follow all instructions carefully.
4.5 Armature Switching – Do not wire the control for armature switching without taking proper precautions.
See Section 13.2, on page 29.
WARNING! Do not switch the armature in and out of circuit or catastrophic failure will result. If arma-
ture switching is required for reversing or dynamic braking, use Model KBMG, KBRG, KBPB, KBCC-R.
4.6 Step-Down Transformer and AC Line Switching – When using a step-down transformer (460 Volts AC to
230 Volts AC), be sure the output current rating of the transformer is at least 3 times the current rating of the
motor. Do not switch the primary side of the transformer to disconnect power or catastrophic failure can
result. Always disconnect the control from the secondary side of the transformer.
5 MOUNTING INSTRUCTIONS
It is recommended that the control be mounted on a flat surface with adequate ventilation. Leave enough room to
allow for AC line, motor connections, and other wiring that is required. Care should be taken to avoid extreme
hazardous locations where physical damage can occur. When mounting the control in an enclosure, the enclosure
should be large enough to allow for proper heat dissipation so that the ambient temperature does not exceed
45 °C (113 °F) at full rating. See Figure 2, on page 11.
6 WIRING INSTRUCTIONS
WARNING! Read Safety Warning, on page 6, before using this control. Disconnect the main power
when making connections to the control. To avoid electric shock be sure to properly ground control.
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