Download Disconnect Switches for use with Variable Frequency Drives

Disconnect Switches for use with
Variable Frequency Drives
Hubbell's Disconnect Switch for Variable Frequency Drives
(VFDs) prevents downtime from out of sequence equipment
shutdowns. The HBLDS3VFD integrates a verified break before
break auxiliary contact factory installed in the HBLDS3 30 Amp
disconnect switch enclosure that interfaces directly with VFDs.
The use of VFDs are being extended to a wide variety of motor
driven equipment applications. VFDs control the frequency of the
electrical power supplied to motors. When a motor disconnect
is turned off in a low frequency state, disconnect contacts can
potentially be damaged. This can cause potential risk of injury to
workers and equipment malfunctions, resulting in costly down
time and repairs.
Through extensive testing, Hubbell has found the use of an early
break auxiliary contact safely disconnects the power by signaling
the VFD that the motor disconnect is being turned off. The VFD
then executes a coast-to-stop preventing any damage to the
disconnect switch and the VFD output device.
HBLDS3VFD
Variable
Frequency Drive
•Tested to be effective for
use with VFDs
•Powers down the drive
prior to opening the motor
disconnect
•Prevents damage to the
motor disconnect and
the VFD
Main Switch
Enable
Input
Normally Open Early Break
Auxiliary Contacts
think SAFETY...
think HUBBELLSAFE
Drive Control
Voltage
24V DC
Disconnect Switches for use with
Variable Frequency Drives
IP66
SUITABILITY
Description
Catalog No.
30A Disconnect switch
with integrated break
before break auxiliary
contact
HBLDS3VFD
HBLDS3VFD
Existing CIRCUIT-LOCK® products which can be retrofitted in the field
by adding the HBLAC2 early break auxiliary contacts.
Circuit-Lock® Unfused Disconnect Switches
Can be used in all existing
20A, 30A 60A and 100A
unfused disconnect switches.
Description
30A Disconnect switch
60A Disconnect switch
100A Disconnect switch
Auxiliary contact
break before break;
1 set of n/o contacts
Auxiliary Contact
Circuit-Lock® Unfused Mechanical Interlocks
Can be used in all existing
20A, 30A 60A and 100A
unfused mechanical interlocks.
For ordering information,
please see our full line catalog
or visit our online catalog at
www.hubbell-wiring.com.
HBLAC2
®
Wiring Systems
www.hubbell-wiring.com
Hubbell Wiring Systems • Hubbell Incorporated (Delaware) • 40 Waterview Drive • Shelton, CT 06484
Phone (800) 288-6000 • FAX (800) 255-1031
Printed in U.S.A. Specifications subject to change without notice. ® is a registered trademarks of Hubbell Incorporated.
WLFS002 2/11
Catalog No.
HBLDS3
HBLDS6
HBLDS10
HBLAC2