Curtis Query?????????

[killercarrot]

Being ham fisted and breaking the Pro 120s. I have popped a set of spare Curtis controllers (1208c? with pauls adaptor box) in.
These work fine on the cradle, but when on the ground, sometimes one side seems to stick.
I also found that when I put a mixer inline the signal drops right off, and puts it in embarrasing crawl mode.
Any ideas gratefully recieved. I am toying with the idea of bunging the Ncc60s in, but its a lot of fannying around, and I quite like the look of the curtis controllers, there is a certain well made quality about them....

[woody]

Sounds odd Rob ... But some Curtis controllers have a lot of safety features ...... not always Robot friendly.
Itll detect things like low battery voltage and goes into economy mode ... likewise overvoltage ...in this instance it shuts down and needs to be restarted.

BTW...I have a spare Paul adaptor should you require it.

[woody]

Overvoltage
The 1208C controller€™s internal circuitry self-protects during short-term overvoltage
conditions. The overvoltage circuitry can be specified to either short the
motor or open the motor connection (letting the vehicle coast).
If the short option is specified, the motor will be braked to a stop so that the
vehicle can no longer travel while the overvoltage condition exists. Because the
motor is actually shorted, the braking effect may be significant. This is the
recommended option for all 1208C controllers, and is required to meet TÅ“V
regulations.
If the coast option is specified, the motor will freewheel during overvoltage
and will coast as long as the overvoltage condition exists. The €œcoast€ option is
not appropriate for manned vehicles, because the controller cannot influence the
vehicle€™s travel while freewheeling.
NOTE: The overvoltage protection circuitry is designed to protect the controller
during brief periods of overvoltage. These conditions may exist if the
batteries become disconnected or any circuit protection devices open. Attempts
to operate the vehicle for extended periods in an overvoltage condition€”such as
trying to drive the vehicle with the charger attached and charging€”will damage
the controller.

Nominal input voltage 24 V and 36 V
Maximum operating voltage 125% of nominal voltage
Minimum operating voltage 16.5 V at 24 V; 27.5 V at 36 V
Nominal current limit 45-70 amps at 24 V; 25-45 amps at 36 V
Time/current rating may be held at full current for 30 seconds (continuous
current rating depends on mounting; 25 amps typical)

[simon]

My Curtis make my motors go slower in reverse than forward. Is it possible to adjust this out ?

[blazerbotics]

what mixer have you put in? the futaba mixers (also some ones built into TX) they reduce power to 60% when in the extremes of both channels. the GWS ones are best. i used the the same setup as you in my middleweight and had no problems.

[woody]

@ Simon.....

Reduced Reverse Speed (% of maximum speed)

The 1208C controller can be specified with a reduced maximum reverse speed.
This is a safety feature designed to prevent full speed in reverse where vehicle
control may be restricted. A 60% maximum reverse speed setting is typical and
is a good compromise between performance and control in reverse.

http://www.junktronix.com/curtis/curtis.html
has some info that you may find usefull.

Curtis in Northampton could check your controllers settings.