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Brake Resistor

 

General

When servo motors are braked, electrial energy is generated in the motor. This energy is fed back through the brake circuit that is integrated in the servo amplifier p.s.u. to a brake resistor, where it is dissipated as heat. More theoretical explanations are on page Four Quadrant Operation.

Many of our servo amplifier have a built-in brake resistor. However, in some situations the permissible power dissipation of this internal resistor is insufficient. The deciding factors in choosing the right resistor are the resistance value (in ohms) and the required power dissipation. All resistors meet the requirements of CE directives and are UL registered.

Refer to the Accessories Manual for detailed information.

The resistors are available with different power classes, for projecting refer to the page Calculation of brake power.

To avoid any fault during operation  the following conditions have to be observed:

  • unhindered access of cooling air
  • unhindered diverting of warmed up air
  • maximum ambient temperature 40°C
    Caution: If the ambient temperature is higher than 40°C, you have to lower the continuous dissipation for 4% per 10 K temperature rise!

In cases of insufficient cooling or false mounting the resistor or the surrounding devices could be overheated or damaged.

Current Kollmorgen brake resistors

Overview

Type BAFP Type BAR Type BAS
Flat profile Tube resistor Plate resistor
IP40 IP20 IP20

Excess temperature in dependance of continuous dissipation

Normal operation range (up to 130%)
Recommended operation range for maximum product life and failure free operation

Allowable threshold (up to 160%)
Allowable operation range, danger of shorter product life and higher failure probability

Unallowable operation range (more than 160%)
Danger of excessive heat and destruction of resistor and neighbouring components

Mounting and distances

Free Space BAFP BAR BAS
(1) 200 mm 200 mm 300 mm
(2) 300 mm 200 mm 1000 mm

Documentation and assignment

CE, UL, and RoHS information can be found on page Approvals.
Refer to the Accessories Manual for detailed information.

  Resistance Rated Power Max. Power Max. Operating Voltage unique nergy absorption every 120 s Usable for Drawing
 Type
(data sheet)
(Ohm) (W) (W) (VDC) (kWs) S300
(S3xx61)
S300
(S3xx01)
S400
S601...620
S701...712
S640
S748
S670
S772
S724 AKD-
x003...06

AKD-
x01206
x02406

AKD-
x02407
3D
BAS(U) 2000-10 10 2000 3200 850 200         x         STEP
BAS(U) 3000-10 10 3000 4800 850 300         x         STEP
BAS(U) 6000-10 10 6000 9600 850 600         x         STEP
BAR(U) 500-15 15 500 800 850 22       x       x   STEP
BAR(U) 1000-15 15 1000 1600 850 44       x       x   STEP
BAS(U) 2000-15 15 2000 3200 850 200       x       x   STEP
BAS(U) 3000-15 15 3000 4800 850 300       x       x   STEP
BAS(U) 6000-15 15 6000 9600 850 600       x       x   STEP
BAR(U) 600-23 23 600 960 850 30           x     x STEP
BAR(U) 1000-23 23 1000 1600 850 44           x     x STEP
BAS(U) 2000-23 23 2000 3200 850 200           x     x STEP
BAS(U) 3000-23 23 3000 4800 850 300           x     x STEP
BAS(U) 4000-23 23 4000 6400 850 400           x     x STEP
BAFP (U) 100-33 33 100 160 850 2.7     x       x     STEP
BAFP(U) 200-33 33 200 320 850 9     x       x     STEP
BAR(U) 250-33 33 250 400 850 7     x       x     STEP
BAR(U) 500-33 33 500 800 850 30     x       x     STEP
BAR(U) 1500-33 33 1500 2400 850 35     x       x     STEP
BAS(U) 3000-33 33 3000 4800 850 300     x       x     STEP
BAR(U) 300-66 66 300 480 850 7 x                 STEP
BAR(U) 600-66 66 600 960 850 22 x                 STEP
BAR(U) 1000-66 66 1000 1600 850 44 x                 STEP
BAR(U) 300-91 91 300 480 850 7   x               STEP
BAR(U) 600-91 91 600 960 850 22   x               STEP
BAR(U) 1000-91 91 1000 1600 850 44   x               STEP