Matrix
®
APAX Installation Guide 380V - 415V
15 mtecorp.com Form: MX-IG-E January 2018 REV. 002
Harmonic Filter Field Checks
1. Read and understand the Matrix APAX Technical Reference Manual which can be
downloaded at www.mtecorp.com/matrix-apax-literature-documents/. Locate figures and
drawings for your particular filter and identify the terminal locations.
2. Disconnect all power and remove input power wiring from U1, V1, and W1 terminals.
3. Remove VFD drive power connections from filter terminals U2, V2, and W2 as well as
any control wiring to the filter contactor or temperature switch. (For filters using control
transformers: remove power fuses on top of transformer.)
4. Visually inspect filter terminals and wiring lugs for signs of heat and corrosion. Contact
factory if any wires appear to be missing or cut!
5. Inspect the U4, V4, and W4 capacitor interconnect terminals and wiring.
6. Visually inspect all capacitors for signs of case deformation, bowing of the top, leaking
oil or terminal damage. Note the CAP- # and date code of any damaged capacitors.
7. Using a multi meter set to read 100K ohms check:
a. Phase to phase U1-V1-W1-U1 (mechanically activate contactor if present) after
reactor and caps charge reading should be about 40K (total equivalent breeder
resistance value). Open circuit or very low readings indicate a problem.
b. Phase to chassis U1- case, V1-case, and W1-case; low readings indicate a
ground fault problem.
8. Ensure the “disconnect” is safe then wire the utility power to U1, V1, and W1.
9. Apply power and verify that proper output voltage is present on U2, V2, and W2.
10. Using a clamp on amp meter read the filter input current:
a. Readings will be 0.4 of the capacitor current listed in the Matrix APAX Technical
Reference Manual found at www.mtecorp.com/matrix-apax-literature-
documents/. Mechanically activate the contactor if the filter is equipped with one.
Readings should be the same (+/- 5%) for all phase currents; contact the
factory if currents are out of tolerance!
b. Open contactor readings will show zero current for all phases.
11. Disconnect filter power and wire the VFD to U2, V2, and W2 as well as any control
wiring to the filter contactor or temperature switch. Replace any control transformer
fuses. Follow the drive power startup guidelines in the drive manufacturer’s user manual.