Hitachi Braking Devices

Hitachi Braking Devices

JRB, SRB and HRB Series - Braking Resistors for SJ100/ SJ300 Drives

Used to increase the control torque of the inverter, for frequently repeated ON-OFF cycles of the inverter, or for decelerating a load with large inertia. Available models include:

• JRB120-1 - Braking resistor, 120W, 180 ohms
  
  
• JRB120-2 - Braking resistor, 120W, 120 ohms
  
  
• JRB120-3 - Braking resistor, 50W, 120 ohms
  
  
• JRB120-4 - Braking resistor, 120W, 35 ohms
  
  
• SRB200-1 - Braking resistor, 200W, 180 ohms
  
  
• SRB200-2 - Braking resistor, 200W, 100 ohms
  
  
• SRB300-1 - Braking resistor, 300W, 50 ohms
  
  
• SRB400-1 - Braking resistor, 400W, 35 ohms
  
  
• HRB1 - Braking resistor, 400W, 50 ohms
  
  
• HRB2 - Braking resistor, 600W, 35 ohms
  
  
• HRB3 - Braking resistor, 1200W, 17 ohms

NSRB Series - NEMA 1 Braking Resistors for SJ100/ SJ300 Drives

NEMA 1 rated specifications include:

• NEMA 1, ANSI-61 gray powder coat enclosures with ventilated covers.
• Resistor assemblies wired with high temperature Teflon® wire to a two-point terminal block.
• Resistor assemblies protected by a normally closed thermal sensing switch.
• Resistance values are ± 10%.
• All terminals, terminal hardware and connection jumpers are stainless steel.
• Enclosed junction box area for terminal block and thermal switch.

NEMA 1 rated braking resistor models include:

• NSRB200-1 - Braking resistor, 200W, 180 ohms, NEMA 1 rated, for use with SJ100/SJ300 series drives
  
  
• NSRB200-2 - Braking resistor, 200W, 100 ohms, NEMA 1 rated, for use with SJ100/SJ300 series drives
  
  
• NSRB300-1 - Braking resistor, 300W, 50 ohms, NEMA 1 rated, for use with SJ100/SJ300 series drives
  
  
• NSRB400-1 - Braking resistor, 400W, 35 ohms, NEMA 1 rated, for use with SJ100/SJ300 series drives

Frequently Asked Questions

• Will I be able to add dynamic (resistive) braking to my Hitachi SJ100 drive after the initial installation?
  Yes. The SJ100 inverter already has a dynamic braking circuit built in. Just add the resistor sized to meet the braking requirements.
  
  
• How will I know if my application will require resistive braking?
  For new applications, it may be difficult to tell before you actually test a motor/drive solution. In general, some applications can rely on system losses such as friction to serve as the decelerating force, or otherwise can tolerate a long decel time. These applications will not need dynamic braking. However, applications with a combination of a high-inertia load and a required short decel time will need dynamic braking. This is a physics question that may be answered either empirically or through extensive calculations.