NORD Drivesystems B1000 - Manual (Page 742)

www.nord.com G740 G1000 – Subject to Change Without Notice
BRAKES
Double Brakes (DBR)
Some applications require two independent brakes to
meet industry safety guidelines.
Double Brakes for Theatrical Applications
Many international standards for braking systems
used on theatre hoists mandate the use of brakes
that automatically set when power is removed. Re-
dundancy is also required with the system brakes. If
one brake fails, the other brake can still operate the
system by running independently and parallel to each
other. NORD DBR (2xBRE) brake systems are designed
to meet these requirements. The NORD double brakes
are also designed for quiet operation < 50dB(A).
Some safety standards require that the load brake hold
1.25 times the rated load at test. We recommend selecting
the brake for approximately 1.6 to a maximum of 2.0
times the required operating torque for each brake.
The NORD double theatre brakes do not need to
be worn-in and will achieve their full braking toque
initially.
Two brake rectifi ers are required for operating a
double brake systems. These will be provided as loose
parts and are normally mounted in the customers
control panel.
The double brake option will add motor length
compared to the single brake.
Motor Brake 7 Springs 5 Springs 4 Springs
[Nm] [lb-ft] [Nm] [lb-ft] [Nm] [lb-ft]
63S/L DBR6 2 x 6 2 x 4.4 2 x 4 2 x 3 2 x 3.5 2 x 2.6
71S/L DBR6 2 x 6 2 x 4.4 2 x 4 2 x 3 2 x 3.5 2 x 2.6
80S DBR6 2 x 6 2 x 4.4 2 x 4 2 x 3 2 x 3.5 2 x 2.6
80L DBR12 2 x 12.5 2 x 9.2 2 x 8.5 2 x 6.3 2 x 7 2 x 5.2
90S DBR12 2 x 12.5 2 x 9.2 2 x 8.5 2 x 6.3 2 x 7 2 x 5.2
90L DBR25 2 x 25 2 x 18.4 2 x 17.5 2 x 12.9 2 x 14 2 x 10.3
100L DBR25 2 x 25 2 x 18.4 2 x 17.5 2 x 12.9 2 x 14 2 x 10.3
100LA/4 DBR50 2 x 50 2 x 37 2 x 35 2 x 26 2 x 28 2 x 20.7
112M DBR50 2 x 50 2 x 37 2 x 35 2 x 26 2 x 28 2 x 20.7
132S DBR75 2 x 75 2 x 55 2 x 52 2 x 38 2 x 42 2 x 31
132M DBR125 2 x 125 2 x 92 2 x 89 2 x 66 2 x 70 2 x 52
160M DBR187 2 x 187 2 x 138 2 x 132 2 x 97 2 x 107 2 x 79
160L DBR187 2 x 187 2 x 138 2 x 132 2 x 97 2 x 107 2 x 79
180MX/LX DBR300 2 x 300 2 x 221 2 x 225 2 x 166 2 x 150 2 x 111
200L DBR500 2 x 500 2 x 369 2 x 375 2 x 277 2 x 250 2 x 184
Build
Options
• NORD recommends delayed operation of one
of the brakes. If the brakes are operated
simultaneously, the combined torques may
result in excessive torque for the gear unit
or other mechanical system elements. If the
brakes are set at the same time even in an E-stop
condition, the gear units must be sized to handle
this increased torque.
CAUTIONS