NORD Drivesystems B1000 - Manual (Page 736)

www.nord.com G734
BRAKES
G1000 – Subject to Change Without Notice
Brake Times & Electrical Selection
Brake timing performance is critical in selecting the
optimal brake system. NORD brakes can provide ex-
ceptional performance in terms of the release (start)
times and engagement (stop) times. Use the follow-
ing 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 sepa-
rate source.
- If you are using a frequency inverter, soft-start or a
two speed motor you will need to supply the rectifi er
from a separate power source.
- If the motor is powered direct across-the-line the
rectifi er power can be supplied from the motor’s ter-
minal block.
2) What type of performance do I need?
- Is the standard brake performance OK?
- Is a higher performance required for fast brake re-
lease or very fast brake stopping?
Selection Sugestions
When Fast or Very Fast Stopping is Recommended
Any applications that require quick stops and posi-
tive action at stand-still
• conveyors and inclined conveyors
• hoists and lifts
• bulk material handling equipment (bucket elevators,
idler
conveyor’s).
• Hoisting (lifting/lowering) applications - must
have the brake wired for fast response.
CAUTIONS
When Fast-Release is Recommended (Overexcitation)
Any application that is very high-cycling with fre-
quent starts and stops. These applications require
the brake to release very-quickly in order to avoid ex-
cessive heat build-up in the AC motor and brake coil.
• Index conveyors
• Diverters
• Storage and retrieval crane systems
Power Source Brake Release
(start)
Brake engagement
(stop)
Braking Method
*
Rectifi er
Motor
Terminal Block
Standard Standard (AC switching) 10 GV/GH
Standard Fast (DC switching) 15 GV/GH
Standard Very Fast (Reduced power holding) 40 GPE
Fast (Overexcitation) Standard (AC switching) 30 GPE
Fast (Overexcitation) Fast (DC switching) 35 GPE
Separate
Power Source
Standard Standard (AC switching) 20 GV/GH
Standard Fast (DC switching) 25 GV/GH
Standard Very Fast (Reduced power holding) 55 GPU
Fast (Overexcitation) Standard (AC switching) 45 GPU
Fast (Overexcitation) Fast (DC switching) 50 GPU
* Braking methods referenced in connection diagrams on pages 743 - 748
Selection