KB Electronics KBVF-48 - Manual (Page 14)

level of 160% of the rated drive current. The CL Trimpot is used to recalibrate the drive current from
60% thru 200%. The Power Start™ circuit provides an overshoot function that allows most motors to
develop more than 200% of starting torque and breakdown torque.
Standard I 2 t is undesirable because it causes nuisance tripping. It allows a very high motor current to
develop and will turn the drive off after a short period of time. KB’s RMS Current Limit Circuit avoids
this nuisance tripping while providing maximum motor protection.
If the motor is overloaded to 120% of full load (75% of the CL setting), the I 2 t Timer starts. If the
motor continues to be overloaded at the 120% level, the timer will shut down the drive after 30 min-
utes. 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 FINGER-SAFE COVER
The drive is designed with an IP-20 Finger-Safe Cover which provides protection against accidental contact
with high voltage.
WARNING! Disconnect main power when removing or installing the Finger-Safe Cover.
WARNING! To prevent accidental contact with high voltage, it is required that the Finger-Safe
Cover be properly installed onto the drive after all wiring and setup is complete. It offers
protection against electric shock which limits the potential liability to the equipment manufacturer
and installer.
5.1 REMOVING THE FINGER-SAFE COVER – The Finger-Safe Cover will have to be removed before
wiring the drive or setting selectable jumpers. All trimpots can be readjusted with the Finger-Safe
Cover installed. Notice the orientation of the Finger-Safe Cover before removing it.
To remove the Finger-Safe Cover, gently lift up on the four retainer clips until the cover disengages
from the base.
Note: The Finger-Safe Cover is designed with a removable panel (on the trimpots side) which must be
removed for installation of optional accessories SIVFR Signal Isolator and Run/Fault Relay (Part No.
9597) or Multi-Speed Board (Part No. 9503). Complete instructions are provided with the accessories.
5.2 INSTALLING THE FINGER-SAFE COVER – To install the Finger-Safe Cover, be sure to properly align
the retainer clips. Gently push the Finger-Safe Cover onto the base until the retainer clips are fully
engaged with the base.
6 SETTING SELECTABLE JUMPERS
The drive has customer selectable jumpers
which must be set before the drive can be
used. For the location of jumpers, see Figure 5,
on page 13.
6.1 60H Z AND 50 H Z MOTOR OPERATION
AND DRIVE OUTPUT FREQUENCY
SELECTION (JUMPERS J1 AND J2) –
Both jumpers must be set for the appropri-
ate motor nameplate frequency rating. Jumpers J1 and J2 are located on the lower PC board.
6.1.1 Setting the Drive for 60 Hz or 50 Hz Motor Operation – The drive is factory set to operate
60 Hz motors. Jumper J1 is factory set to the “60Hz” position and Jumper J2 is factory set to
the “X1” position. For 50 Hz motors, set Jumper J1 to the “50Hz” position and be sure Jumper
J2 is set to the “X1” position. See Figure 8.
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FIGURE 8 – 60 Hz & 50 Hz MOTOR SELECTION
60 Hz Motor Operation
(Factory Setting)
(J1 Installed in “60Hz” Position)
(J2 Installed in “X1” Position)
50 Hz Motor Operation
(J1 Installed in “50Hz” Position)
(J2 Installed in “X1” Position)
J2
J1
50/60Hz
X1 X2
J2
J1
50/60Hz
X1 X2