AMETEK MX CTSL - Manual (Page 29)

User Manual MX-CTSL Compliance Test System
California Instruments Revision J 29
3.4 OMNI-3-37MX Unit
The OMNI-3-37MX Zref impedance provides 0.24 + 0.15j Ohms for each phase and 0.16 + 0.10j Ohm for
the neutral. This Zref is required for IEC 61000-3-3 flicker test.
If only an OMNI-3-75 is present, the MX30-3Pi or MX45-3Pi programmable impedance must be used to
increase the required resistive portion of the flicker reference impedance for IEC 61000-3-3 testing. In this
case, either the OMNI-3-75 must be manually controlled or the programmable impedance must be
manually set as the CTSMXL software can only control one impedance type at a time. If the CTSMXL
software is configured to use the OMNI-3-75 control through the MX system interface, the MX30 or MX45
programmable impedance can be set manually while in flicker mode after selecting the test setup but
before clicking on the START button as the front panel will be unlocked at this time. It is important to only
set the Resistive portion of the programmable impedance as the inductive values of the OMNI-3-75 and
OMNI-3-37MX are the same. See 15.6 for differences in impedance values of both OMNI's.
If both OMNI's are present (MXCTSH configurations with optional CTSMXL software added), only one
OMNI can be connected at a time to prevent impedance build-up. A quick disconnect scheme is provided
in this case to allow switching between OMNI units. Refer to Figure 3-8.
Only manual control of the flicker or BYPASS state on the OMNI-3-37MX is supported through the front
panel push button.
3.4.1 Mechanical Installation
The OMNI-3-37MX is contained in a separate 19" wide cabinet with a 5.25" height (3U). This cabinet
should be placed as near the MX-45-3Pi as possible.
The OMNI-3-37MX has its own IEC320 AC power input for bias power. Check the input rating set at the
back of the OMNI-3-37MX chassis. It can be set for either 115V or 230V AC. DO NOT CONNECT if the
input rating is set incorrectly. The setting can be changed by pulling out the fuse holder. The set line input
voltage is shown through the small window on the IEC320 connector.
If the OMNI-3-37MX is installed in an OMNI-3-75 cabinet as part of a CTSHL system, you must first turn on
the power to the OMNI-3-37 using the front panel On/Off rocker switch located at the bottom of the cabinet.
This ensures the OMNI-3-75 is engaged connected the MX output power. Then use the OMNI-3- 37MX
On/Off switch to turn the OMNI-3-37MX on or off. Note that if the OMNI-3-37MX is turned off, it disconnects
the output. For both harmonics and flicker testing, the OMNI-3-37MX must be turned on and placed in
either Bypass (for Harmonics) or Flicker mode using the front panel MODE button.
The OMNI-3-37MX can operate in one of two modes:
Bypass mode This mode is used during harmonics test
Flicker mode This mode is used during flicker test
Note: The OMNI-3-37MX mode is not controlled by the CTSMXL Software. Instead, the OMNI-37MX front
panel control button is enabled to allow manual switching between modes.