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

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