Nabrico DF-1 N Series, Owner'S Manual

Page: 65 / 72

65
NABRICO DF-1 N ELECTRIC WINCH Owner’s Manual
OM-DF1-021-A
MOTOR BRAKES
INSTALLATION & MAINTENANCE
RETAIN FOR FUTURE USE U35000 - 11 of 19
www.nord.com/docs 06.13.16
NORD Gear Corporation
Toll Free in the United States: 888.314.6673
NORD Gear Limited
Toll Free in Canada: 800.668.4378
Brake Times & Electrical Selection
Brake timing performance is critical in selecting the optimal
brake system. NORD brakes can provide exceptional perfor-
mance in terms of the release (start) times and engagement
(stop) times. Use the following guidelines in order to select
the correct brake control components and connections.
1) Determine if the brake needs to be wired directly
from the motor terminal block or powered by a
separate power source.
- If you are using a frequency inverter, soft-start or a
two speed motor you will need to supply the
rectifier from a separate power source.
- If the motor is powered direct across-the-line the
rectifier power can be supplied from the motor’s
terminal block.
2) What type of performance do I need?
- Is the standard brake performance OK?
- Is a higher performance required for fast brake release
or very fast brake stopping?
3) Determine the brake supply voltage and check the
rectifier compatability using the table on page 10?
Selection Suggestions
When Fast Stopping is Recommended
Any applications that require quick stops and positive action
at stand-still
Recommended Applications
• conveyors and inclined conveyors
• hoists and lifts
• bulk material handling equipment
(bucket elevators, idler conveyor’s).
CAUTION
• Hoisting (lifting/lowering) applications - must have
the brake wired for fast response.
When Fast-Release is Recommended (Overexcitation)
Fast Release is recommended in any application that is very
high-cycling with frequent starts and stops. These applica-
tions require the brake to release very-quickly in order to
avoid excessive heat build-up in the AC motor and brake coil.
Recommended Applications
• Index conveyors
• Diverters
• Storage and retrieval crane systems
Power Source Brake Release
(start)
Brake engagement
(stop)
Braking
Method *
Rectifier
Motor
Terminal Block
Standard Standard (AC switching) 10 GVE/GHE/GUE
Standard Fast (DC switching) 15 GVE/GHE/GUE

Fast (Overexcitation) Standard (AC switching) 30 PMG 500

Fast (Overexcitation) Fast (DC switching) 35 PMG 500
Separate
Power Source
Standard Standard (AC switching) 20 GVE/GHE/GUE
Standard Fast (DC switching) 25 GVE/GHE/GUE

Fast (Overexcitation) Standard (AC switching) 45 PMG 500

Fast (Overexcitation) Fast (DC switching) 50 PMG 500
* Braking methods referenced in connection diagrams on pages 11-15.

Please see important note below:
IMPORTANT NOTE
The PMG500 rectifier is required when utilizing the larger 800 Nm (590 lb-ft) - and 1200 Nm (885 lb-ft) twin-rotor brakes. In
order to prevent rapid wear, NORD recommends using the PMG500 rectifier to “overexcite” the brake during its release. The
brake coil should be sized utilizing the PMG rectifier like a half-wave rectifier.