Specifications

MODELS 7225AC, 7425AC
LINE-POWERED AC BRUSHLESS SERVO AMPLIFIERS
WITH +/-10V ANALOG U-V INPUTS
/ENABLE INPUT ACTIVE LEVEL CONTROL
DIP switch S1, ENAB POL, controls active level of the amplifier
enable input at J3-5. The default position is S1 OFF, this will
make the /Enable input ground-active, >2.5V will disable the
amplifier. With S1 ON, this will make the /Enable input disable
amplifier if grounded, >2.5V will enable.
S1
ENAB POL
OFFON (Default)
ENABLE INPUT FAIL SAFE CONTROL
Jumper JP1-B, on the signal board, controls the /Enable input
level control resistor. The figure below shows the function, with
S1 OFF and JP1-B on pins 1-2 as the default condition. The
/Enable input must be pulled LO to enable the amplifier, and if
the input is open (disconnected or wire broken) the amplifier
turns off as the input is pulled-up to +5V. This is called fail-safe
because the amplifier must be connected, and the input
actively driven to ground to turn the amplifier ON, otherwise its
OFF.
+5V
J3-5
JP1-B
1 2 3
/Enable
10k
10k
33nF
SET FOR
DIP SW S1
1 2 3
OFF (Default)
ON
If an active HI fail-safe operation is desired, then turn S1 ON
and move JP1-B to pin 2-3. Now the input is pulled-down to
ground if it is disconnected, and must be actively pulled-up to
>2.5V by the control system to enable the amplifier.
U V PHASE ANGLE
Jumper JP1-A, on the signal board, sets the UV phase to either
120
or 90 . The default is 120 .
JP1-A
1 2 3
120 Degrees UV Phase (Default)
90 Degrees UV Phase
Copley Controls Corp, 20 Dan Road, Canton, MA 02021, USA Tel: [phone] Fax: [phone]
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MOTOR TEMPERATURE SENSOR
The /MOTEMP (J2-9) line must be pulled to GND
(J2-15) in order to enable the amplifier. The figure
below shows the function. A normally closed thermal
switch can be connected to protect the motor from
over temperature. When the switch opens the
/MOTEMP line is pulled to +5V through a 10k resistor,
disabling the amplifier.
+5V
J2-9
/Motemp
10k
10k
33nF
J2-15
Motor
Thermalswitch
GND
Jumper required if no thermalswitch
REFERENCE INPUTS
The reference inputs are the command signals to the amplifier.
There are two differential reference inputs U Ref (+), U Ref (-)
and V Ref (+), V Ref (-) Use all four reference wires. Connect
U Ref (-) and V Ref (-) to control system ground. Connect U
Ref (+) and V Ref (+) to control systems separate
10V
outputs. This will reject noise between control system and
amplifier grounds. Use twisted-pair cable to minimize noise
pickup between amplifier and controller.
U V PHASE CURRENT ZERO ADJUSTMENT
BALANCE ADJUSTMENT RANGE
Control of the balance adjustment range can be made via
internal components RH16 and RH17 on the header socket.
The full-scale can be adjusted over a typical range of 500mA to
50mA. A good first approximation would be 5% of the motors
continuous current rating. See below table, for selecting
resistor values for RH16 and RH17. The default values are
indicated in bold.
U V zero adjust full-scale RH16 & RH17
Offset
full-scale mA
Rx (
)
500 200k
400 250k
300 330k
200 475k
100 1M
50 2.2M
These values are within 10%, typically. For greater accuracy,
measure current monitor and select parts for exact full-scale
value.
Phone: [phone]
Phone: 877-IP-Tech1
Fax: 877-IP-Tech2
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