“The Right Control for Your Application.”
12095 NW 39 Street, Coral Springs, FL 33065-2516
KB Electronics, Inc. Phone: 954-346-4900; Fax: 954-346-3377
(A40288) - Rev. E - 6/6/2005 - Z3562E00 Page 8 of 20
Figure 3
Models KBVF-14, 24, 24D, 26D Mechanical Specifications (Inches/mm)
(Model KBVF-26D Shown with Finger-Safe Cover Installed)
(See
Figure 4, On Page XX, for Expanded View of Jumpers and Trimpots)
99.0
3.90
0.2
5.1
112
4.40
127
5.00
10.2 2.0
3.07
77.9
3.82
97.0
1.32
33.5
4.30
109 145
5.70
4.70
119
0.4 0.08
5.70
145
Figure 4
Expanded View of Jumpers and Trimpots
4 IMPORTANT APPLICATION INFORMATION
4.1 Motor with External Fan Cooling: Most totally enclosed fan-cooled (TEFC) and open ventilated 3-phase AC induction motors will
overheat if used beyond a limited speed range at full torque. Therefore, it is necessary to reduce motor load as speed is decreased.
Note: Some fan-cooled motors can be used over a wider speed range. Consult the motor manufacturer for details.
WARNING! Some motors have low speed characteristics which cause overheating and winding failure under light load or no
load conditions. If the motor is operated in this manner for an extended period of time, it is recommended that the unloaded motor
current be checked from 2-15 Hz (60-450 RPM) to ensure motor current does not exceed the nameplate rating. Do not use motor
if the motor current exceeds the nameplate rating.
It is recommended that the drive be used with Inverter Duty or TENV motors.
Inverter duty and most totally enclosed non-ventilated (TENV) motors can provide full rated torque over an extended speed range
without overheating. See
Figure 5, on page XX.
If external fan cooling is provided, open ventilated motors can also achieve an extended speed range at full rated torque. A box fan
or blower with a minimum of 100 CFM is recommended. Mount the fan or blower so the motor is surrounded by the airflow. See
Figure 6, on page XX.
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