Advanced motion controls b25a40

Advanced Motion Controls - B25A40 Series
B25A40 SERIES BRUSHLESS SERVO AMPLIFIERS
Model: B25A40
ELECTROMATE
Toll Free Phone (877) SERVO98
Toll Free Fax (877) SERV099
www.electromate.com
sales@electromate.com
FEATURES:
* Surface-mount technology
* Small size, low cost,
ease of use
* Optical isolation, see block diagram
* DIP switch selectable modes:
current, open loop, tachometer,
HALL velocity and encoder velocity
* Four quadrant regenerative operation
DESCRIPTION: B25A40 Series PWM servo amplifiers are designed to drive brushless DC motors at a high switching
frequency. The B25A40 is fully protected against over-voltage, under-voltage, over-current, over-heating and short-circuits.
This model interfaces with digital controllers or can be used as stand-alone drive and requires only a single unregulated DC
power supply. A single red/green LED and a single digital output indicate operating status. Loop gain, current limit, input
gain and offset can be adjusted using 14-turn potentiometers. The offset adjusting potentiometer can also be used as an on-board
input signal for testing purposes when SW1 (DIP switch) is ON.
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C-34
MODEL
POWER STAGE SPECIFICATIONS B25A40
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DC SUPPLY VOLTAGE 120 - 400 V
PEAK CURRENT (2 sec. max., internally limited) ± 25 A
MAXIMUM CONTINUOUS CURRENT (internally limited) ± 12.5 A
MINIMUM LOAD INDUCTANCE* 600 μH
SWITCHING FREQUENCY 20 KHz ± 15%
HEATSINK (BASE) TEMPERATURE RANGE 0o to +65o C, disables if >65o C
POWER DISSIPATION AT CONTINUOUS CURRENT 115 W
OVER-VOLTAGE SHUT-DOWN (self reset) 420 V
BANDWIDTH 2.5 KHz
MECHANICAL SPECIFICATIONS
POWER CONNECTOR Screw terminals
SIGNAL CONNECTOR Molex connector
SIZE 8.0 x 6.26 x 1.36 inches
203.2 x 159.1 x 34.6 mm
WEIGHT 2 lb.
0.91 kg
* Low inductance motors require external inductors.

C-35
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PIN FUNCTIONS
CONNECTOR PIN NAME DESCRIPTION / NOTES I/O
1 MOTOR A Motor phase A connection O
2 MOTOR B Motor phase B connection O
P2 3 MOTOR C Motor phase C connection O
4 POWER GND Power ground GND
5 HIGH VOLTAGE DC power input I
1 +10 V, 5 mA OUT For customer use O
2 SIGNAL GND Reference ground GND
3 -10 V, 5 mA OUT For customer use O
4 +REF IN Differential reference input,
maximum ±15 V, I
5 -REF IN 50K input resistance
6 -TACH IN Tachometer input, max. ±60 VDC, 60K input
resistance
I
7 VELOCITY MONITOR OUT
Hall-velocity mode: 1 V = 100 Hz Hall sensor
frequency. Encoder velocity mode: 1V = 25KHz
encoder frequency
O
8 CURRENT MONITOR OUT SW3=OFF , 1 V = 2 A
SW3=ON , 1 V = 4 A
O
P1 9 INHIBIT IN
Pull to ground to inhibit. For inverted
inhibit inputs, see section "G".
I
10 +V HALL 30mA OUT Power for HALL sensors,
short circuit protected, O
11 GND +6 V @ +30 mA GND
12 HALL 1 HALL sensor inputs, logic levels,
internal 2 KW pull-up.
13 HALL 2
Maximum low level input is 1.5 V,
I
14 HALL 3
minimum high level input is 3.5 V.
15 CURRENT REFERENCE
OUT
Monitors the input signal connected directly to the
internal current amplifier. 7.5 V = maximum peak
set current. See page C-37.
O
16
FAULT OUT
(LED red)
TTL level output. Becomes high during output
short circuit, over-voltage, under voltage inhibit,
and during power-up reset. Fault condition
indicated by red LED.
O
1 + 5 V, 300 mA OUT Encoder Power O
2 CHANNEL A TTL level quadrature encoder input I
P3
ENCODER 3 NC Not connected NC
4 CHANNEL B TTL level quadrature encoder input I
5 GND Encoder common GND
NOTE: All circuits on connectors P1 and P3 are optically isolated from all circuits on connector P2.

C-36
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SWITCH FUNCTIONS
SWITCH FUNCTION DESCRIPTION SETTING
ON OFF
1
Test / Offset. Sensitivity of the "offset" pot.
Used as an on-board reference signal in test
mode.
Test Offset
2 Current loop gain Decrease Increase
3
Current scaling.
When OFF, increases sensitivity of current
sense thus reducing both peak and continuous
current limit by 50%.
100% 50%
4
Loop integrator. This capacitor normally
ensures "error-free" operation in velocity mode
by reducing the error signal (output of
summing amplifier) to zero.
Shorts out the
velocity/voltage loop
integrator capacitor
Velocity/voltage loop
integrator operating
5 Internal duty-cycle feedback for open loop
mode
Open loop No effect
6
Velocity feedback. Connects the internally
generated velocity signal from HALL sensors. On Off
7 Velocity direction. Changes the polarity of the
velocity signal.
Normal Inverted
8 Current reduction. Reduces continuous
current limit by 50%.
Continuous / peak current
limit ratio is 50%
Continuous / peak current
limit ratio is 25%
9 Integrator capacitor. Adjusts the value of the
integrator capacitor in velocity mode.
Increase Decrease
10 60/120 degree commutation phasing setting 120 degree phasing 60 degree phasing
POTENTIOMETER FUNCTIONS
POTENTIOMETER DESCRIPTION TURNING CW
Pot 1
Loop gain adjustment in open loop & velocity modes. Voltage to
current scaling factor adjustment in current mode. Increases loop gain
Pot 2 Current limit. It adjusts both continuous and peak current limit
while maintaining selected ratio.
Increases current limit
Pot 3 Reference in gain. It adjusts the ratio between input signal and
output variables (voltage, current, velocity).
Increases reference
input gain
Pot 4
Test / Offset. Used to adjust any imbalance in the input signal or
in the amplifier. When SW1 (DIP switch) is ON, the sensitivity of
this pot is greatly increased thus it can be used as an on-board
signal source for testing purposes. See section "G".
N/A
ELECTROMATE
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C-37
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TEST POINTS FOR POTENTIOMETERS
See section "G".
OPERATING MODE SELECTION
These modes can be selected by the DIP switches according to the chart in the functional block diagram:
* Current mode
* Open loop mode
* Tachometer mode
* HALL velocity mode
* Encoder velocity model
See section "G" for more information.
SET-UP
See section "G" for engineering and installation notes.
CURRENT LIMIT ADJUSTMENTS
These amplifiers feature separate peak and continuous current limit adjustments. The current limit adjustment Pot 2 adjusts
both peak and continuous current limit at the same time. It has 12 active turns plus 1 inactive turn at each end and is
approximately linear. Thus, to adjust the current limit turn the potentiometer counter-clockwise to zero (using ohmmeter),
then turn clockwise to the appropriate value.
In many applications it is sufficient to use only the DIP switches for current limit adjustments. SW3 reduces both peak and
continuous current limit by 50% when OFF. SW8 reduces only the continuous current limit by 50% when OFF:
SW8 CONTINUOUS / PEAK CURRENT LIMIT RATIO
ON 50%
OFF 25%
P1-15 is the input to the internal current amplifier stage. Since the output current is proportional to P1-15, the adjusted
current limit can easily be observed at this pin without connecting the motor. Note that a command signal must be applied
to the reference inputs to obtain a reading on P1-15. The maximum peak current value equals 7.5 V at this pin. If SW3=ON,
peak rated amplifier current = 7.5 V. If SW3=OFF, ½ peak rated amplifier current =7.5 V. Example: using the B25A40 with
SW3=ON, 25A=7.5V and with SW3=OFF, 12.5A=7.5V.
The actual output current can be monitored at pin P1-8.
ORDERING INFORMATION
Models: B25A40X
X indicates the current revision letter.
TYPICAL SYSTEM WIRING: See section "G".
MOUNTING DIMENSIONS:

C-38
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Advanced motion controls b25a40

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Advanced motion controls b25a40