KB Electronics KBVF-23P - Manual (Page 28)

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Application Note – 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 Figures 2A, 2B, 3A and 3B, on
pages 16 –19.
When mounting the Main Speed Potentiometer, be sure to install the insulating disc between the
potentiometer and the panel.
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 procedure is recommended. A typical hi-pot test setup is shown in Figure 15, on page 29.
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.