12
Commissioning the Unit
The commission procedure is as follows:
1. If the chiller has been stored outdoors, allow at least 24 hours
room temperature stabilization prior to commissioning.
Ensure any condensation that occurs as a result of the ambi-
ent temperature is allowed to evaporate.
2. Enter parameters in the applicable PIC6 menu screen.
3. Install surge suppression devices if required.
4. Review the power wiring and grounding to ensure that it has
been properly connected.
5. Visually examine the inside of the drive enclosure to:
a. Look for signs of corrosion or moisture residue.
b. Remove any dirt or debris.
c. Make sure all vents are clear.
6. Apply power to the drive and take thermal measurements of
the capacitor bank and power connections. Do this again
before start-up.
7. Measure and record the incoming line voltage. Line-to-line
voltages should be balanced within 3% as calculated below:
Measure voltages phase-to-phase and phase-to-ground.
Vmax = Maximum measured phase-to-phase voltage
(A to B, B to C, C to A)
Vmin = Minimum measured phase-to-phase voltage
Imbalance Calculation Formula
8. Take a final thermal measurement of the capacitor bank and
power after finalizing the installation to ensure all connec-
tions are good.
9. If a ground fault occurs, then do the following:
a. Check for a ground in the motor or motor wiring.
b. Check for damage to wiring insulation and that wiring is
dry.
c. Verify the motor wiring is separated from ground and
there is no connection between phases.
d. Check for failed IGBTs.
10. If an overcurrent fault occurs, then do the following:
a. Check for excessive load and verify load limit settings
on the HMI.
b. Check motor and wiring insulation.
c. Check parameter settings in the General VFD menu.
Check that the VFD Current Limit is set 1.03x Motor
RLA or greater (limited by drive and motor size).
Check Internal Jumpers
On the Main VFD Control board there are 2 jumpers labeled J1
HARDWARE ENABLE and J2 SAFETY ENABLE. J1 should
be removed and J2 should be in place. See Fig. 13.
Va vg =
(VAB + VBC + VCA)
3
Imbalance % =
(Vmax – Vmin) x 100
Va vg
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