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Regenerative DC Bus
Supply Sizing
Input Power Conditioning
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Regenerative DC Bus Supply Operation
The 1336 REGEN Package
The following steps should be taken to size the 1336 REGEN
Package for Regenerative DC Bus Supply Operation.
1. The 1336 REGEN Converter, 1336 REGEN Precharge and
1321 10% Line Reactor must be sized as a package, with all
components having the same nameplate amp rating.
2. The power capability of the 1336 REGEN Package must equal
the maximum continuous power requirement of all common bus
drives connected to the 1336 REGEN Package. Total drive
power can be calculated as follows:
P
=
P
+
TOTAL
DRIVE 1
P
Where
DRIVE
3. The input amp rating of the 1336 REGEN Package must be
greater than or equal to the AC line amps calculated using the
following formula.
≥
I
P
INPUT
TOTAL
——————
√3 × VL-L
V
Where
L-L
ATTENTION: The National Codes and standards
!
(NEC, CENELEC, etc.) and local codes outline the
provisions for safely installing electrical equipment.
Installation must comply with specifications regarding
wire types, conductor sizes, branch circuit protection
and disconnect devices. Failure to do so may result in
personal injury and/or equipment damage.
In general, 1336 REGEN equipment is suitable for direct
connection to a correct voltage AC line.
If the AC input power system does not have a neutral or one phase
referenced to ground as detailed under Ungrounded Distribution
Systems, an isolation transformer with the neutral of the
secondary grounded is highly recommended. If the line-to-ground
voltages on any phase exceed 125% of the nominal line-to-line
voltage, an isolation transformer with the neutral of the secondary
grounded is highly recommended.
P
+
P
DRIVE 2
DRIVE n
= P
MOTOR SHAFT
——————————
MOTOR EFFICIENCY
=
The RMS Line-to-Line AC Input Voltage
2–3
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