KB Electronics KBDA-42 - Manual (Page 18)

If the motor is overloaded to 120% of the Motor Nameplate Rated Current setting, the I2t
Timer starts. If the motor continues to be overloaded at the 120% level, the timer will shut
down the drive after 30 minutes. If the motor is overloaded to 160% of full load, the drive will
trip in 6 seconds.
*UL approved as an overload protector for motors.
5 MOUNTING INSTRUCTIONS
It is recommended that the drive be mounted vertically on a flat surface with adequate ventilation.
Leave enough room below the drive to allow for AC line, motor connections, and any other connections
that are required. Although the drive is designed for outdoor and washdown use, care should be taken
to avoid extreme hazardous locations where physical damage can occur. When mounting the drive in an
enclosure, the enclosure should be large enough to allow for proper heat dissipation so that the ambi-
ent temperature does not exceed 45°C (113 °F) at full rating. The recommended mounting screw size is
1/4 inch (M6). See Figures 6 and 7, on pages 14 and 15.
WARNING! Do not use this drive in an explosion-proof application.
Be sure the drive is securely mounted.
6 ELECTRICAL CONNECTIONS
WARNING! HIGH VOLTAGE – Read Safety Warning, on page 6, before using the drive.
Disconnect main power before making connections to the drive. To avoid electric shock,
be sure to properly ground the drive.
Application Note: To avoid erratic operation, do not bundle the AC line and motor wires with each
other or with wires from signal following, start/stop contacts, or any other signal wires. Also, do not
bundle motor wires from multiple drives in the same conduit. Use shielded cables on all signal wires
over 12” (30 cm). The shield should be earth grounded on the drive side only. Connect the drive in
accordance with the National Electrical Code requirements and other local codes that may apply.
Be sure to properly fuse each AC line conductor that is not at ground potential. Do not fuse neutral
or grounded conductors. A separate AC line switch or contactor must be installed as a disconnect
so that each ungrounded conductor is opened. For fuse or circuit breaker selection, see Table 3, on
page 10. Also see Section 6.1, on page 18.
To maintain the watertight integrity of the drive, be sure to use suitable liquidtight fittings and wires
that are appropriate for the application. Model KBDA-24D contains mounting holes for standard 1/2”
liquidtight fittings (not supplied) (two liquidtight plugs are provided, if only one knockout is used).
Models KBDA-27D, 29, 45, 48 contain two mounting holes for standard 1/2” liquidtight fittings (not
supplied) and one mounting hole for standard 3/4” liquidtight fitting (not supplied) (two liquidtight
plugs are provided, if only one knockout is used). The Liquidtight Fittings Kit (Part No. 9526) is avail-
able for all models (see Table 1, on page 9).
The drive is designed with a hinged case so that, when the front cover is open, all wires stay intact.
To open the cover, the four screws must be loosened so they are no longer engaged in the case bot-
tom. After mounting the drive and all electrical connections are complete, close the cover making
sure that the wires do not get caught or crimped as the cover is closed. Tighten the four screws so
that the gasket is slightly compressed. The recommended tightening torque is 12 in-lbs (14 kg-cm).
See Figures 6 and 7, on pages 14 and 15, for the tightening sequence. Do not overtighten.
17