Matrix
®
E-Series Technical Reference Manual 380V – 480V
Form: MAE-TRM-E September 2020 REV. 001 24
Harmonic Filter Field Checks
1. Disconnect all power and remove input power wiring from U1, V1, and W1 terminals.
2. 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.)
3. Visually inspect filter terminals and wiring lugs for signs of heat and corrosion.
Contact factory
if any wires appear to be missing or cut!
4. Inspect the U4, V4, and W4 capacitor interconnect terminals and wiring.
5. 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.
6. 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.
7. Ensure the “disconnect” is safe then wire the utility power to U1, V1, and W1.
8. Apply power and verify that proper output voltage is present on U2, V2, and W2.
9. Using a clamp on amp meter read the filter input current:
a. 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.
10. 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 start-up guidelines in the drive manufacturer’s user manual.