Specifications

MODEL 503
DC BRUSHLESS SERVO AMPLIFIER
Copley Controls, 20 Dan Road, Canton, MA 02021, USA Tel: [phone] Fax: [phone]
Tech Support: E-mail: [e-mail], Web: http://www.copleycontrols.com
APPLICATION INFORMATION
To use the model 503 set up the
internal header with the components
that configure the transconductance,
current limits, and load inductance.
Current-limits and load inductance set
up the amplifier for your particular
motor, and the transconductance
defines the amplifiers overall response
in amps/volt that is required by your
system.
COMPONENT HEADER
SETTINGS
Use the tables provided to select
values for your load and system. We
recommend that you use these values
as starting points, adjusting them later
based on tests of the amplifier in your
application.
LOAD INDUCTANCE (RH1,CH2)
Maximizes the bandwidth with your
motor and supply voltage. First replace
CH2 with a jumper (short). Adjust the
value of RH1 using a step of 1A or less
so as not to experience large signal
slew-rate limiting. Select RH1 for the
best transient response ( lowest
risetime with minimal overshoot). Once
RH1 has been set. choose the
smallest value of CH2 that does not
cause additional overshoot or
degradation of the step response.
TRANSCONDUCTANCE (RH6,7)
The transconductance of the 503 is the
ratio of output current to input voltage.
It is equal to 10k
/RH6 (Amps/Volt).
RH6,and RH7 should be the same
value and should be 1% tolerance
metal film type for good common-mode
noise rejection.
CURRENT LIMITS (RH3, 4, & 5)
The amplifier operates at the 5A
continuous, 10A peak limits as
delivered. To reduce the limit settings,
choose values from the tables as
starting points, and test with your
motor to determine final values. Limit
action can be seen on current monitor
when output current no longer changes
in response to input signals. Separate
control over peak, continuous, and
peak time limits provides protection for
motors, while permitting higher
currents for acceleration.
SETUP BASICS
1. Set RH1 and CH2 for motor load
inductance (see following section).
2. Set RH3, 4, & 5 if current limits
below standard values is required.
3. Ground the /Enable (/Enable Pol
open), /Pos Enable, and /Neg
Enable inputs to signal ground.
4. Connect the motor Hall sensors to
J2 based on the manufacturers
suggested signal names. Note that
different manufacturers may use
A-B-C, R-S-T, or U-V-W to name
their Halls. Use the required Hall
supply voltage (+5 or +15V). Note
that there is a 30 mA limit at +5V.
Encoders that put-out Hall signals
typically consume 200-300 mA, so if
these are used, then they must be
powered from an external power
supply.
5. Connect J1-4,5 to a transformer-
isolated source of DC power,
+18-55V. Ground the amplifier and
power supply with an additional wire
from J1-5 to a central ground point.
6. With the motor windings
disconnected, apply power and
slowly rotate the motor shaft.
Observe the Normal (green) led. If
the lamp blinks while turning then
the 60/120° setting is incorrect. If J2-
2 is open, then ground it and repeat
the test. In order to insure proper
operation, the correct Hall phasing of
60° or 120° must be made.
6.Turn off the amplifier and connect
the motor leads to J1-1,2,3 in U-V-W
order. Power up the unit. Apply a
sinusoidal reference signal of about
1 Hz. and 1Vrms between
Ref(+) and Ref(-), J2-10,11.
7. Observe the operation of the motor
as the current monitor signal passes
through zero. When phasing is correct
the speed will be smooth at zero
crossing and at low speeds. If it is not,
then power-down and re-connect the
motor.
There are six possible ways to connect
the motor windings, and only one of
these will result in proper motor
operation. The six combinations are
listed in the table below. Incorrect
phasing will result in erratic operation,
and the motor may not rotate. When
the correct combination is found,
record your settings.
J1-1 J1-2 J1-3
#1 U V W
#2 V W U
#3 W U V
#4 U W V
#5 W V U
#6 V U W
GROUNDING & POWER
SUPPLIES
Power ground and signal ground are
common ( internally connected ) in this
amplifier. These grounds are isolated
from the amplifier case which can then
be grounded for best shielding while
not affecting the power circuits.
Currents flowing in the power supply
connections will create noise that can
appear on the amplifier grounds.
This noise will be rejected by the
differential amplifier at the reference
input, but will appear at the digital
inputs. While these are filtered, the
lowest noise system will result when
the power-supply capacitor is left
floating, and each amplifier is
grounded at its power ground terminal
( J1-5 ). In multiple amplifier
configurations, always use separate
cables to each amplifier, twisting these
together for lowest noise emission.
Twisting motor leads will also reduce
radiated noise from pwm outputs. If
amplifiers are more than 1m. from
power supply capacitor, use a small
(500-1000
F.) capacitor across power
inputs for local bypassing.
Phone: [phone]
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