Talon SRX Speed Controller – Combat Robot Quick
Talon SRX Speed Controller – Combat Robot Quick Guide
The Talon SRX is a single channel forward/reverse speed controller for brushed DC motors. The
controller can be mounted using (2X) #8-32 screws. The Talon SRX’s mounting location should be
chosen to allow for adequate air flow around the heat fins and sides of the case. The aluminum
case is electrically isolated from the electronics; it is safe to mount directly to a metal surface.
Mounting the Talon SRX securely to a robot’s metal frame allows the frame to aid in cooling.
Wire Length
Wire
Case
Marking
Wire Color
Wire Gauge
Battery +
V+
Red
12 AWG
5.5 in
Battery -
GND
Black
12 AWG
5.5 in
Motor Output
M+
White
12 AWG
5.5 in
Motor Output
M-
Green
12 AWG
5.5 in
PWM Signal
None
Yellow
22 AWG (x2)
11.0 in
PWM Ground
None
Green
22 AWG (x2)
11.0 in
± 0.25 in
Note: There are two yellow and two green signal wires. Signal wires of the same color
are electrically identical.
Wiring the Motor Output
Connect the white wire to the M+ side of the motor and the green wire to the M- side of the
motor. If the motor’s inputs are not marked, the polarity of the input may be chosen by the user.
Wiring the Power Input
The red ‘V+’ wire connects to the positive terminal of the battery, and the black ‘GND’ wire to the
negative terminal. Take care to get this right.
WARNING: THE TALON SRX DOES NOT INCLUDE REVERSE POLARITY PROTECTION.
IF WIRED BACKWARDS, THE TALON SRX MAY BE PERMANENTLY DAMAGED.
Wiring the Signal Input
A standard 3-pin (0.1in pitch) PWM connector must be attached to the Talon SRX’s signal wires to
allow it to communicate with an R/C receiver. This can be done in one of two ways:
• PWM housing and sockets may be assembled directly onto the signal wires; or
• A pre-assembled PWM cable may be cut and spliced onto the Talon SRX’s signal wires.
The PWM cable should be wired such that the green (ground) and yellow (signal) wires are on the
outside of the connector. The center pin requires no wire – the Talon SRX does not supply 5 volt
power to your receiver. The correct placement of signal and ground wires is compared to standard
Futaba and JR cables below.
Only two of the four signal wires are needed to control the Talon SRX with PWM. Do not connect
two PWM connectors to a single Talon SRX. The two signal wires not used should be electrically
isolated using tape or heat shrink tubing and bundled out of the way.
Note: Signal wires of the same color are electrically identical.
It does not matter which is used as long as the color is correct.
Brake & Coast Modes
The Talon SRX has two possible responses to a neutral throttle signal:
• Brake mode: dynamic braking is applied by shorting the motor leads together, applying a
slowing force to the rotating motor. Brake mode does not have any effect when the motor is
not rotating.
• Coast mode: no braking force is applied and the motor coasts freely.
Combat robots generally use brake mode. To switch between Brake and Coast mode at any time
by pushing the B/C CAL button. In brake mode the button is illuminated red and in coast mode the
red light is turned off. The brake/coast setting is saved in memory.
R/C Calibration
Your radio system may have “max” and “min” throttle signals that differ from the default Talon
SRX values. Calibrating the Talon SRX allows it to adjust for these differences so that a “max”
signal results in “max” output.
1) Press and hold the B/C CAL button until the Status
LEDs begin to rapidly blink red & green.
2) While holding the button, move the transmitter
joystick to full forward then to full reverse. This may
be done multiple times.
3) Release the joystick and allow it to return to neutral,
and then release the B/C CAL button.
4) If the calibration was successful the status LEDs will blink green several times. If the
calibration failed, the status LEDs will blink red and the previous calibration will be kept.
Calibration profiles are saved in memory -- you don’t need to repeat this each time.
To restore the default calibration hold the B/C CAL button down while powering up the Talon SRC
and release the button when the status LEDs blink green.
Blink Codes
Calibration
Status LEDs
Rapid Red / Green
Blinking Green
Blinking Red
Talon SRX State
In Calibration Mode
Successful Calibration
Failed Calibration
Normal Operation
LEDs
Colors
Both
Blinking Green
Both
Blinking Red
Both
None
Alternate*
Alternate*
Solid Orange
None
Off / Red
Red / Orange
Talon SRX State
Forward throttle is applied.
Blink rate is proportional to throttle
Reverse throttle is applied.
Blink rate is proportional to throttle
Zero throttle (dead band)
No Power is applied to Talon SRX
No receiver signal present
Damaged Hardware
* the two LEDs swap colors when blinking.
Mode Selection
B/C CAL Button Color
Solid Red
Off
Talon SRX State
Brake Mode
Coast Mode
Troubleshooting: see full user guide - http://www.ctr-electronics.com/talon-srx.html
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