KB Electronics KBVF-48 - Manual (Page 16)

The enclosure should be large enough to allow for proper heat dissipation so that the ambient temperature
does not exceed 45 °C (113 °F). Leave enough room to allow for AC line, motor connection, and other
wiring that is required. See Figure 4, on page 12.
When mounting the Main Speed Potentiometer, be sure to install the insulating disc between the poten-
tiometer and the panel.
Models KBVF-29, 48:
1. When mounting these drives in a vertical direction, the cooling fan must be on top.
2. When mounting the drive in an enclosure, be sure to leave at least 2” of clearance around the cooling
fan for proper heat dissipation.
8 RECOMMENDED HIGH VOLTAGE DIELECTRIC WITHSTAND TESTING (HI-POT TESTING)
Testing agencies such as UL, CSA, etc., usually require that equipment undergo a hi-pot test. In order to
prevent catastrophic damage to the drive, which has been installed in the equipment, the following proce-
dure is recommended. A typical hi-pot test setup is shown in Figure 13. All drives have been factory
hi-pot tested in accordance with UL requirements.
Warning! All equipment AC line inputs must be disconnected from the AC power.
8.1 Connect all equipment AC power input lines together and connect them to the H.V. lead of the Hi-Pot
Tester. Connect the RETURN of the Hi-Pot Tester to the frame on which the drive and other auxiliary
equipment are mounted.
8.2 The Hi-Pot Tester must have an automatic ramp-up to the test voltage and an automatic ramp-down
to zero voltage.
Note: If the Hi-Pot Tester does not have automatic ramping, then the hi-pot output must be manually
increased to the test voltage and then manually reduced to zero. This procedure must be followed for
each machine being tested. A suggested Hi-Pot Tester is Slaughter Model 2550.
CAUTION! Instantly applying the hi-pot voltage will cause irreversible damage to the drive, which will
void the warranty.
16
1 2
3 0
AC KILOVOLTS
10mA
LEAKAGE
0mA
High Voltage Dielectric Withstand Tester (Hi-Pot Tester)
ZERO MAX
VOLTAGE TEST
RESET H. V.
RETURN
(Main Power Disconnected)
to AC Line Inputs
Connect Hi-Pot
AC Line Input
L1
L2
Chassis
Auxiliary Equipment
Chassis
Frame
Motor Wires
(Main Power Disconnected)
Connect All Drive Terminals Together
P3
Signal Inputs
P1
P2
W
L1
L2
U
V
L3
Adjustable Frequency Drive
Machine Equipment or Frame
FIGURE 13 – TYPICAL HI-POT TEST SETUP