Automation Direct DURA PULSE GS-2DBU, User Manual

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Chapter 1: Overview and Component Specifications
2nd Ed., Rev.C – 06/14/2019 – DURA
pUlse
Drives Dynamic Braking User Manual 1–3
Special Symbols
When you see the “notepad” icon in the left-hand margin, the paragraph to its
immediate right will be a special note.
W
hen you see the
“
exclamation mark
”
icon in the left
-
hand margin
,
the paragraph to
its immediate right Will be a Warning
. t
his information could prevent injury
,
loss of
property
,
or even death
(
in extreme cases
).
Introduction
Dynamic Braking
All dUra
pUlse
GS3 and GS4 series AC drives are capable of dynamic braking to enable an AC
motor with a high-inertia load to decelerate more rapidly than could be otherwise achieved,
and to absorb the energy generated when a three-phase induction motor decelerates.
Applications with high-inertia type loads tend to cause the motor to regenerate energy back
into the AC drive. This regeneration causes the AC drive’s internal DC bus voltage to rise,
which can cause an over voltage fault. With dynamic braking, the energy generated by the
overhauling motor is dissipated through dedicated braking resistors as heat.
As shown in the selection tables in this chapter, lower-capacity drives can connect directly
to the optional external braking resistors, but higher-capacity drives also require optional
dynamic braking units installed between the drives and resistors.
Dynamic Braking Units
dUra
pUlse
dynamic braking units are used with larger dUra
pUlse
AC Drives to continuously
monitor the drive’s DC bus voltage. When bus voltage exceeds a predetermined level
(depending on the supply voltage) the dynamic braking unit dissipates the excess energy
into external resistors in the form of heat. dUra
pUlse
dynamic braking units must be used
along with GS series braking resistors to provide optimum braking performance.
dUra
pUlse
dynamic braking units are available for both 230V or 460V dUra
pUlse
AC Drives.
MASTER/SLAVE configurations allow the use of multiple dUra
pUlse
dynamic braking units in
order to accommodate the power ratings of larger dUra
pUlse
AC Drives and motors.
dUra
pUlse
dynamic braking units (GS-1DBU, GS-2DBU, GS-3DBU and GS-4DBU) are approved
by Underwriters Laboratories, Inc. (UL) and Canadian Underwriters Laboratories (cUL).
Unpacking
After receiving the dUra
pUlse
dynamic braking unit, please check for the following:
• Make sure that the part number indicated on the package corresponds with the part number of
your order.
• Make sure that the package includes the dUra
pUlse
dynamic braking unit and the dUra
pUlse
dynamic braking unit User Manual.
• Inspect the contents to insure they were not damaged during shipment.