Rockwell Automation 2090-UCSR-P900 User Manual

Installation Instructions

900 Watt Passive Shunt Module

Ultra Series drives and controllers can require external power
dissipation when large inertial loads are present. To ensure that drive
faults due to excessive bus voltage do not occur, loads requiring
power dissipation that exceed a drive’s internal shunt capability
require the use of external shunt resistor(s).

The passive shunt (Catalog No. 1398-SR9PF or 2090-UCSR-P900) can
be used with the following products:

Drive Catalog No.

ULTRA 200 Drives 1398-DDM-075, -075X, -150, and -150X

ULTRA Plus Drives 1398-PDM-075 and 1398-PDM-150B

Ultra3000 Drives 2098-DSD-075, -075-SE, -075-DN, -075X, -075X-DN, -150,

-150-SE, -150-DN, -150X, and -150X-DN

Ultra5000 Drives 2098-IPD-075, -075-DN, -150, and -150-DN

ATTENTION

Using the passive shunt with modules not listed can
cause equipment damage or personal injury.

!

As a motor decelerates, power is returned from the motor to the drive
module, causing the bus voltage on the drive to increase. Ultra servo
amplifier products have circuitry that senses the voltage on the drive’s
DC bus and dissipates power when needed. When the bus voltage
reaches the shunt turn-on voltage of the drive, the internal shunt
circuitry allows the excessive regenerated power to be dissipated
through an external resistor. After the bus voltage is reduced to the
turn-off voltage level, the shunt transistor turns-off and no additional
power is dissipated by the shunt resistor.

1 Publication 2090-IN001A-EN-P — March 2001

2 900 Watt Passive Shunt Module

Installing the Shunt

Do not mount shunt module
on its side

Orientation and Clearance

The following enclosure restrictions must be considered because the
shunt module dissipates excess regenerative power in the form of
heat. Refer to Figure 1 on page 2 and Figure 4 on page 9 for shunt
module spacing requirements.

Figure 1 Shunt Module Spacing Requirements Within an Enclosure

Do not mount temperature
sensitive components above
shunt module

155 mm (6.1 in.) min. of clearance
above the shunt module.

155 mm (6.1 in.) min. of
clearance on each side of the
shunt module.

155 mm (6.1 in.) min. of
clearance on each side of the
shunt module.

ATTENTION

!

ATTENTION

!

155 mm (6.1 in.) min. of clearance
below the shunt module

The shunt module can release a large amount of heat
over time.

Any materials above the shunt module or its
enclosure may need the protection of a metal plate
to keep from deteriorating.

Failure to observe this precaution could result in
damage to surrounding materials, possibly leading to
fire.

The shunt module can release a large amount of heat
inside an enclosure.

Ensure there is enough ventilation so as the

maximum ambient temperature of 50° C (122° F) is
not exceeded.

Failure to observe this precaution could result in
damage to the shunt module.

Publication 2090-IN001A-EN-P — March 2001

900 Watt Passive Shunt Module 3

If the work environment dictates, mount the shunt module in an
enclosure providing protection against dust and splashing water
(IP54), or dust free and protected against water jets (IP65).

ATTENTION

!

Many NEMA (National Electrical Manufacturers Association) Type 4
cabinets provide this level of protection.

ATTENTION

Avoid contaminating electronic components.

Provide a quality air source to cabinets; free of
debris, oil, corrosives, or electrically conductive
contaminates. All cabinets should have scheduled
inspections and be cleaned as needed.

Failure to observe these safety procedures could
result in breakdown and damage to equipment.

If you mount the shunt module inside a cabinet, you
must make sure that the ambient temperature inside
the cabinet does not exceed 50° C (122° F).

!

Publication 2090-IN001A-EN-P — March 2001

4 900 Watt Passive Shunt Module

900 Watt Continuous Dissipation Cabinet Layout

Figure 2 details the proper position and cable separation for mounting
a single shunt module with a one drive inside a cabinet.

Motor power cable

IMPORTANT

Only one passive shunt module can be used per
DDM/PDM/DSD-075, IPD-075 or damage to the
drive will result.

Figure 2 Typical Shunt Module Position and Conductor Routing for 900W Continuous Dissipation

AC power cable

155 mm (6.1 in.) of minimum clearance on all
sides of the shunt module

Always separate low voltage signal
wiring from high voltage power wiring to
reduce affects of EMI

Twist conductors (2 twists per foot min.)

Publication 2090-IN001A-EN-P — March 2001

Shielded metal conduit, shielded cable,
and ferrite filters are also recommended
for reducing the effects of EMI

When shielding is used, the shield must
be grounded to the shunt and drive as is
the motor power cable

Low voltage communications, Control I/O, and
Motor feedback cables