AMETEK MX CTSL - Manual (Page 44)

User Manual MX-CTSL Compliance Test System
California Instruments Revision J 44
3.6 PACS-3-75 Unit
The PACS-3-75 measurement module can be operated on either 115V or 230 V. It requires less than 0.5
Amps to function.
Note: Check the correct Line input voltage setting of the PACS-3-75 prior to applying line voltage. If
incorrect, move the voltage selection to the correct position before applying power. See paragraph
3.6.4.
3.6.1 Mechanical Installation
The PACS-3-75 should be placed near the MX and OMNI to minimize cable runs. Both the PACS-3-75 and
OMNI-3-37MX can be mounted in a standard cabinet to be placed next to the MX power source.
The units are fan cooled, drawing air in from the sides and exhausting at the rear. The sides of the unit
must be kept clear of obstruction and a 6 inch (152 mm) clearance must be maintained to the rear for
proper cooling.
3.6.2 EUT Connection Wiring
See Error! Reference source not found., Figure 3-7 and Figure 3-8 for wiring configuration depending on
system configurations. The wire size used is dictated by the measured currents and voltages. Any wire
used must be rated for the maximum expected current and voltage. The PACS-3-75 unit is rated for 75A
RMS maximum per phase when the rear power terminals are used and therefore AWG 6 is recommended.
The wire gauge for the wiring between the MX and OMNI-3-37MX input should be AWG 4 and is supplied
with the MXCTS system.
The PACS-3-75 is rated for 75 A max. and as such requires the use of at least AWG 6 wire gauge or larger
diameter to connect to the EUT.
Caution: It is important to keep the distance between the PACS-3-75 output and the EUT as
short as possible to avoid adding additional wiring impedance to the test setup.
This is particularly important for flicker test measurements, as the wire impedance will affect the level of any
voltage fluctuations caused by the EUT. Try to limit any output wiring to no more than 5 feet (1.5 meters) or
use larger diameter wire as the distance to the EUT increases. Refer to Figure 3-9.
Caution: Be sure to replace the small rear top cover on the PACS-3-75 unit after the wiring has
been installed, otherwise insufficient cooling of internal components may result. Refer to Figure
3-10.