BD25A-AC Series
BD25A-AC SERIES BRUSHLESS SERVO AMPLIFIERS
Model: BD25A20AC
120 VAC, 50-60 Hz, Single Supply Operation
FEATURES:
•
•
•
•
•
•
•
Surface-mount technology
Small size, low cost, ease of use
Input signal isolation
Hall sensor input isolation
Four quadrant regenerative operation
Hall sensor commutation
Agency Approvals:
BLOCK DIAGRAM:
ADVANCED
MOTION CONTROLS
3805 Calle Tecate, Camarillo, CA 93012 Tel: (805) 389-1935, Fax: (805) 389-1165
B-25
BDC30A Series
DESCRIPTION:
The BD25A20AC Series PWM servo amplifiers are designed to drive brushless DC motors at a high switching
frequency. They are fully protected against over-voltage, over-current, over-heating and short-circuits. All models interface with digital
controllers that have a digital PWM output. PWM IN determines the output duty cycle. DIR IN determines the direction of rotation. They
require a single AC power supply. A single red/green LED indicates operating status. The current limit can be set by DIP switches.
SPECIFICATIONS:
All BD25A20AC specifications are identical to the BD25A20 specifications (see BD30A Series) except for:
MODEL
POWER STAGE SPECIFICATIONS
AC SUPPLY VOLTAGE
SHUNT RESISTOR
SHUNT SWITCH ON VOLTAGE
BUS CAPACITANCE
SHUNT FUSE (d = .25 inches, L = 1.25 inches)
BUS FUSE (5x20 mm)
BD25A20AC
30 - 125 VAC, 50 – 60 Hz
10
Ω
@ 50 W
185 VDC
3600
µF
3 A Motor Delay rated @ 250 VAC
16 A slow-blow rated @ 250 VAC
MECHANICAL SPECIFICATIONS
POWER CONNECTOR
SIGNAL CONNECTOR
SIZE
Screw terminals
Molex connector
7.35
x 4.23 x 2.45 inches
186.7 x 107.4 x 62.2 mm
WEIGHT
2.5
lb.
1.14 kg
These amplifiers contain a rectifier bridge and filter capacitors to generate the DC bus internally from the AC input power. The
DC bus voltage is 1.4 times AC voltage (RMS), e.g. 170 VDC from 120 VAC. During braking much of the stored mechanical
energy is fed back into the power supply and charges the output capacitor to a higher voltage. If the charge reaches the
amplifier's over-voltage shutdown point, output current and braking will cease. To ensure smooth braking of large inertial loads,
a built-in "shunt regulator" is provided in the BD25A20AC. The shunt regulator will switch-on the internal power resistor when
the bus voltage reaches 185 VDC. This resistor then dissipates the extra energy of the DC bus.
APPLICATION NOTE:
Contact factory for information regarding the use of the current monitor pin (P1-15).
OPTICAL INPUT SIGNAL ISOLATION:
PWM, DIR, INH, FAULT inputs are always isolated from the power section. On the
BD25A20AC series the Hall sensor inputs (P1-10 through 14) are also isolated.
ORDERING INFORMATION:
Models: BD25A20ACX
X indicates the current revision letter.
TYPICAL SYSTEM WIRING:
See section “G”.
MOUNTING DIMENSIONS:
See page F-11.
B-26
BD30A Series
BD30A SERIES BRUSHLESS SERVO AMPLIFIERS
Models: BD30A8, BD25A20
FEATURES:
•
•
•
•
•
•
Surface-mount technology
Small size, low cost, ease of use
Input signal isolation
Four quadrant regenerative operation
Hall sensor commutation
Agency Approvals:
BLOCK DIAGRAM:
ADVANCED
MOTION CONTROLS
3805 Calle Tecate, Camarillo, CA 93012 Tel: (805) 389-1935, Fax: (805) 389-1165
B-17
BD30A Series
DESCRIPTION:
The BD30A Series PWM servo amplifiers are designed to drive brushless DC motors at a high switching
frequency.
They are fully protected against over-voltage, over-current, over-heating and short-circuits. All models
interface with digital controllers that have a digital PWM output. PWM IN determines the output duty cycle. DIR IN
determines the direction of rotation. A single red/green LED indicates operating status. The current limit can be set by
DIP switches.
SPECIFICATIONS:
MODELS
POWER STAGE SPECIFICATIONS
DC SUPPLY VOLTAGE
PEAK CURRENT (2 sec. max., internally limited)
MAX. CONTINUOUS CURRENT (internally limited)
MINIMUM LOAD INDUCTANCE*
SWITCHING FREQUENCY
HEATSINK (BASE) TEMPERATURE RANGE
POWER DISSIPATION AT CONT. CURRENT
OVER-VOLTAGE SHUT-DOWN (self reset)
BD30A8
20 - 80 V
±
30 A
±
15 A
200 µH
5 - 20 kHz ±15%
0
o
to +65
o
C, disables if > 65
o
C
60 W
86 V
125 W
195 V
BD25A20
40 - 190 V
±
25 A
±
12.5 A
250 µH
MECHANICAL SPECIFICATIONS
POWER CONNECTOR
SIGNAL CONNECTOR
SIZE
Screw terminals
Molex connector
7.35 x 4.40 x 1.00 inches
186.7 x 111.7 x 25.4 mm
1.5 lb.
0.68 kg
WEIGHT
* Low inductance motors require external inductors.
B-18
BD30A Series
PIN FUNCTIONS:
CONNECTOR
PIN
1
2
3
4
5
6
7
8
P1
9
10
11
12
13
14
15
16
1
2
P2
3
4
5
NAME
PWM+
PWM-
DIR+
DIR-
INH+
INH-
+FAULT
-FAULT
+5 IN
+V HALL OUT
GND
HALL 1
HALL 2
HALL 3
CURRENT MONITOR
OUT
Reserved
MOTOR A
MOTOR B
MOTOR C
POWER GND
HIGH VOLTAGE
Motor phase A connection
Motor phase B connection
Motor phase C connection
Power ground
DC power input
O
O
O
GND
I
DESCRIPTION / NOTES
Same as pin 9
Pulse width modulated digital input
Same as pin 9
Direction input
Same as pin 9
Pull low to enable
Output transistor turns on and becomes high during
output short circuit, over-voltage, over temperature,
inhibit, and during power-up reset. Fault condition
indicated by red LED.
+5 V @ 150 mA in to drive opto coupler inputs.
Power for HALL sensors, Short circuit protected,
+ 6 V @ 30 mA. See optical signal isolation option
below.
HALL sensor inputs, logic levels, internal 5 KΩ pull-
up. Maximum low level input is 1.5 V, Minimum high
level input is 3.5 V. See optical signal isolation option
below.
Current monitor. This signal is proportional to the
actual current in the motor leads. See current limit
adjustments section below for scaling.
I/O
I
I
I
I
I
I
O
I
O
GND
I
O
B-19
PCB Design
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