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Slot Car Controller supplied with POSITIVE track wiring. 20A current rating
For wiring details click here
Built into the new TruSpeed branded Handle. Full features now fitted as standard.
For use outside the UK the pins are not fitted and wires are run from the right hand side of the box to connect your own plug as you wish. (Please specify when placing your order)

Continuous growth in sales and feedback from racers at all levels has enabled development on the PWM MKI resulting in new circuits and new features for the PWM II.
These are listed below in a feature list and basic operation instructions.

NOTE: A couple of controls have been re-named now to better describe their functions.
The old names were carried over from the original controllers made about 5 years ago
With the changes made to the PWM MKII it is best to set a new standard.

Also, since every customer has requested the trigger spring tension and throw adjustments to be added, both of these features are now fitted as standard.
A discounted price has been added since these parts are easier to fit at the production than to add later as an optional upgrade.

Features and operating guide.

Acceleration:
Rate at which power is delivered to the motor: (Choke)
1-12 is slow - fast.

If the trigger is squeezed rapidly from a slow speed up to full throttle then this control prevents the front of the car lifting the guide out of the slot. It helps to reduce the need for a front mounted weight to hold the nose down allowing a lighter car.
Helps with loss of traction out of the corners and losing time down a straight due to snaking or shuddering.

Brake:
Rate at which the motor is slowed when the trigger is released:
1-12 is gentle - full.

Prevents shuddering/rattling and loss of traction, particularly with high gear ratios.
Allows better corner entry speed, and smoother control over the car when power is re-applied.
MODE 1: Normal mode where brakes are always applied at the rate set by the BRAKE control
This is the same as for the PWM I
MODE 2: Sensing mode where the brake rate is modified by the motor speed as a precentage of the BRAKE setting.
On most tracks there are full speed sections followed by a sharp bend for which high brake setting are needed. When the car reaches a section where that amount of braking is not needed, the car will brake too much, too soon, so this sensing mode works in the background automatically adjusting the brakes to suit the speed of the car.

MODE select switches are inside the controller box.
Just unscrew the 4 screws and gently move the sections apart taking care not to stress the ribbon cable joining them.
The MODE switches can be seen next to the BRAKE and START SPEED controls. Mode 2 is with the switch towards the controller handle cable socket.

Hold:
Duration that brakes are applied, and speed to which the car will slow before brakes release.
1-12 is minimum - maximum.

Brake rate is set with the Brake control, with MODE 1 or MODE 2 enabled and the Hold sets the speed to which the car will slow before braking stops and gives way to natural motor braking, assisting cornering speed and control. (The inertia of the car can carry itself round tight bends under natural deceleration, keeping it in the slot.)
HOLD works in the same way for both MODE 1 and MODE 2 BRAKE settings.

Speed:
Maximum speed limit.
1-12 is Slowest - Fastest

Ideal where a track has a long straight, with tight, twisty, difficult sections. A very fast motor is ideal for the long straight, but difficult to manage round the twisty sections. Reducing the Speed setting enables the motor to be tamed for the twisty parts and banked or sweeping corners to allow confident full trigger squeeze without the car flying off the track.
Press the BOOST button to bypass the SPEED setting back up to full speed.
Mode 1: Speed control is in an open loop. The controller feeds an amount of power to the track and assumes that the car will reach the desired speed. This is the same as the PWM I
Mode 2: Speed control is in a partially closed loop. In this mode the controller feeds the same amount of power to the track as in Mode 1, but if the motor does not reach that speed, the controller senses this and feeds a little more or little less power as applicable. It can be thought of as a kind of torque and cruise control.
The easiest way to see it working is to set it in Mode 1 and press the trigger so that motor is just ticking over. Then hold your fingers over the wheels to slow the speed and note how easy it is to stop it. Now change to Mode 2 and do the same again. In this mode you will find it much more difficult to stop the motor, showing that the controller is compensating for the actual motor speed relative to the setting of the trigger.
The idea of this mode is to smooth out power drop-out problems that some tracks exhibit.

Boost:

To easily bypass the limit set on the SPEED control, press the little BOOST button on the rear of the hand controller to give you full speed to fly down that straight. When released, it returns to the previous setting to get you around the corners again. The boost is controlled by the ACCELERATION setting, so the extra power feeds in at the rate you have selected keeping the car motion smooth.

Start Speed:
Defines the lowest initial start-off speed and works in conjunction with the Trigger Controls (see below)
1-12 is slow - fast ('high Ohms to low Ohms')

This adjustment is similar to controllers with a sensitivity or 'Ohms' adjustment, and enables all cars to respond to the full throttle movement in a useful range.
Once the low start-off speed is decided, the rest of the power delivery is divided into 36 steps across the controller element. For a fast start-up then, the change in power between each segment will be small, and for the slow start-up speed, it will be greater.

Trigger controls:

(RED) 10-stage CURVE SENSITIVITY
0-9 Linear to Logarithmic) (no curve to max curve)
This sets the element feel by adjusting the shape of the throttle response curve from linear at setting '0' to logarithmic at setting '9'
The setting should be thought of as the sensitivity control since it directly affects the amount of power at given pints along the trigger wiper element.

(Black) 10-stage END SPEED.
(0-9 is Min to Max)
This sets the size of the jump in speed from the second last to the final segment on the Wiper Element.
As you squeeze the trigger, car speed changes by very small amounts across each of the 36 segments on the Wiper Element. When it reaches the final segment it jumps up to full speed. The size of this jump is set via the END SPEED Control.
The higher the number on the control, the smaller the final jump in speed and so more power is fed to the rest of the element. A low number on the control means a larger jump in speed and so less power fed to the rest of the element.
The idea is to give more control for those difficult tracks, and particularly those with high voltage power supplies. It's a little like the SPEED control and BOOST button, but you don't have to press a switch.
0 = low end speed with largest jump in speed at full Trigger
9= high end speed with smallest jump in speed at full Trigger.

Power and Brake LED:

With no car on the track, but power supplied to the unit, both the Power and Brake LED’s illuminate. When the trigger is pressed they both extinguish. This shows there is no electrical continuity. (No car on the track, bad braids, poor tape condition etc.)
When a car is now placed on the track the Brake LED extinguishes, but the Power LED remains illuminated. This shows electrical continuity to the car and motor.
When full power is delivered to the motor at full throttle, the POWER LED extinguishes, but remains illuminated at all other times.
When using the Speed limiter at full throttle, pressing the Boost button will extinguish the Power LED, confirming the switch is OK.
The Brake LED illuminates while the brakes are active.
The Brake LED will illuminate Blue when there is a short circuit fault either on the car or the track. This is a warning feature and prevents the controller from trying to drive power into the short circuit and becoming damaged.
Spring Tension and Throw Adjustment Features:
Trigger Spring Tension Adjustment.
Under the Trigger is a small screw that pushes on a tension cam arm to pull on the spring.
Turn clockwise to increase tension.
Trigger Throw adjustment.
The screw is accessed through the rear fascia under the BOOST button. It changes the Brake stop position of the trigger when released. This shortens the throw to give quicker reactions and for endurance racing the overall hand and finger movements are reduced to help with fatigue.
Adjustments to the START SPEED, CURVE SENSITIVITY and END STEP SPEED can easily be made to set the controller up for any setting of the THROW adjustment to keep the throttle action smooth and easy to use.

Maintenance:

Once you feel a scratchy operation or can hear sqeaking then it is advisable to apply a small amount of switch Cleaner/Lubricant (such as Servisol Super 10) to the wiper element board. This will keep it smooth, light and maintain the contact integrity
The plug-in cable need not be removed each time it is packed away. The idea is that if there is trouble with the cable it is easy to just plug in a replacement. Spare cable can be found on the web site under spares and accessories.

Read the independent review of the TruSpeed PWM slot car controller by
the NSCC (National Scalextrix Collectors Club)