Rockwell Automation Reliance Electric MD65, User Manual

Page: 29 / 188

5-4
MD65 AC Drive User Manual
5.2.2 Input Power Conditioning
The drive is suitable for direct connection to input power within the
rated voltage of the drive (see table 5.4). Table 5.1 lists certain input
power conditions that may cause component damage or reduction
in product life. If any of the conditions exist, install one of the
devices listed in the “Corrective Action” column in table 5.1 on the
line side of the drive.
Important: Only one device per branch circuit is required. It
should be mounted closest to the branch and sized to
handle the total current of the branch circuit.
5.3 Power Wiring Specifications
Table 5.1 – Corrective Actions for Input Power Conditions
Input Power Condition Corrective Action
Low line impedance (less than 1% line
reactance) Install one of the following:
•
Line reactor
1
•
Isolation transformer
Greater than 120 kVA supply transformer
Line has power factor correction capacitors
Line has frequent power interruptions
Line has intermittent noise spikes in excess of
6000V (lightning)
Phase-to-ground voltage exceeds 125% of
normal line-to-line voltage •
Remove MOV jumper to
ground and install
isolation transformer
with grounded
secondary, if necessary.
Ungrounded distribution system
1
Contact Reliance Electric for application and ordering information.
Table 5.2 – Power Wiring Specifications
Power Wiring Rating Recommended Copper Wire
Unshielded 600 V, 75
°
C (167
°
F) THHN/
THWN
15 mils insulated, dry location
Shielded 600 V, 90
°
C (194
°
F)
RHH/RHW-2
Belden 29501-29507 or
equivalent
Shielded Tray rated 600 V, 90
°
C (194
°
F)
RHH/RHW-2
Shawflex 2ACD/3ACD or
equivalent