Power Cab System Reference. Manual - part 11

MAXIMUM VOLTAGE (CV5)

This is the amount of voltage applied to the motor at full speed. A value of 255 means
send the full available track voltage to the motor. Lower numbers will tell the decoder
to send proportionally less voltage when full speed is called for.

OPS PROG 11:22AM

MAX VOLTAGE: _

A value of 192 will cut the maximum speed to 192/255 (about 75%) of the track
voltage. Most decoders interpret a value of 0 to mean 255.

MID SPEED VOLTAGE (CV6)

This is the amount of voltage applied to the motor when the middle speed step (14 or
64 depending on speed mode) is requested. A value of 128 means to send about ½
the available track voltage (128/255 of the voltage) to the motor.

OPS PROG 11:22AM

MID VOLTAGE: _

Lower or higher values will send proportionally higher or lower voltages at mid-speed.
Most decoders interpret a value of 0 to mean 128.

ACCELERATION (CV3)

With this CV set to 0 the decoder will be in what is commonly called ‘direct drive’. The
decoder will instantly jump to the speed requested by the throttle. You can add
momentum by adjusting this parameter. See also MOMENTUM BUTTON, Page 14.

OPS PROG 11:22AM

ACCELERATION: _

A value of 1 will force a delay of .007 seconds between speed steps in 128 speed
mode (.032 seconds in 28 speed mode). This is equivalent to .896 seconds (.007 x
128 speeds) to go from speed 0 to full speed. A value of 10 will yield about 8.9
seconds to full speed.

DECELERATION (CV4)

Deceleration works to delay the slowing down of the motor with the same timing as
acceleration.

OPS PROG 11:22AM

DECELERATION: _

MOTOR PWM FREQUENCY (CV9)

DCC decoders almost always drive the motor of the locomotive with Pulse Width
Modulation (PWM). This is a series of full voltage pulses that vary in width from very
narrow for low motor speed to very wide providing higher power to the motor. How
often the pulses are sent is called the frequency.

OPS PROG 11:22AM

PWM FREQ: _

The frequency is adjustable on some decoders. Settings for this CV vary so consult
your decoder manual for the proper value. If your decoder is capable of ‘silent’
operation usually a 0 is required.

NCE TORQUE COMPENSATION (Dither) KICK RATE
(CV116)

Newer NCE decoders (V3.5+) provide Torque Compensation for smooth low speed
operation. Torque Compensation gives a steady stream of ‘kicks’ to the motor when
running at very low speeds. You can adjust how often the motor is kicked (Kick
Rate) and how hard it is kicked (Kick Strength). CV116 controls the rate.

OPS PROG 11:22AM

KICK RATE: _

The typical value is 2-4 with the maximum practical value of about 6. The smaller the
number the more often the motor gets a brief voltage kick. A value of 0 turns off the
kick. A value of 1 gives continuous kicks to the motor (not very useful). When using
Torque Compensation set the Start Voltage to 0 for best operation.

NCE TORQUE COMPENSATION (Dither) KICK DEPTH
(CV117)

This is how hard the motor is kicked at low speed. Typical values range from 1 to 40.
High quality motors (Kato) need very little kick strength where lower quality motors
such as old Athearn and LifeLike need relatively large values (30-50) for slow speed
crawling,

OPS PROG 11:22AM

KICK DEPTH: _

Tips for setting up T/C (Torque Compensation):
·Start by setting the locomotive speed to 1 on your throttle.
·Set the Kick Rate to 4.
·Set the Kick Depth to 20 then adjust this value up or down until the locomotive just
barely crawls.
It may be easier to set the T/C with the body shell removed from the locomotive so
that you can see the flywheels turn. When you get fairly good slow speed operation
go back to the Kick Rate and try bumping the value up by 1 or 2 to see if the
operation improves.

DECODER OUTPUT/FUNCTION MAPPING
(Option 5)

General Discussion of function mapping
Function mapping is used to customize which lighting outputs (or sound effects) are
controlled by which function keys on your handheld throttle. Each function command,
F0 through F12, is assigned a unique CV that allows the corresponding function
command to be redirected to up to 14 different lighting outputs or sound effects.
A single function key can control more than one output if desired.
It is also possible for one output to be controlled by multiple function keys. In this
case, the output will be turned on when any of the corresponding function keys are
active. That output will turn off only when all relevant inputs have also been turned
off.
Note that all function commands cannot be mapped to all outputs. The LCD display
on your Power Cab

will indicate only those outputs that can be mapped to each

function command.

The F0 function has two CVs - one for forward direction and one for reverse.
Function outputs mapped to these CVs will be directional unless the same output is
mapped to both CVs. CVs 33 and 34 are both for the F0 function.

On NCE decoders CV33 and CV34 do not provide directionality (see SETUP NCE
LIGHTING EFFECTS below) but otherwise operate the same as above. With NCE
decoders direction of operation for function outputs is provided by the lighting effects
CVs 120 through 127.
Lenz and TCS decoders do not follow NMRA standard function mapping procedures.
When you select function mapping you are prompted for the function number to map.

PRESS FUNCTION

NUMBER TO MAP

The top line of the LCD displays the function number and the output numbers that
can be controlled by the function.

F2 12345678

OUTPUTS: —4——

Pressing a digit key will enable the output on the decoder when the function is
activated. Pressing the same digit key again will disable the output. In the display
above the 4 key has been pressed so that output number 4 will activate when ever
the F2 button is pressed on your handheld cab. If you were to press another digit
such a 6, both output 4 and output 6 will be controlled by pressing F2.

When mapping functions higher than 3, the top line of the LCD will use small numbers
to indicate the output numbers 10 through 14. To enable/disable these high numbers
press the digit key that is 10 less than the output number. Example: press 0 for
output 10, 1 for output 11, etc. Pressing PROG/ESC will exit from mapping at any
time.

SETUP NCE LIGHTING EFFECTS (Option 6)

You can use this option to customize the lighting effects for your NCE decoder
equipped locomotives. This programming option will only work with NCE decoders.

NCE EFX 07:04

OUTPUT NUMBER:_

Function outputs are numbered from 1 to 14. Do not confuse Output numbers with
Function numbers. The headlight is always output 1 and the reverse light is usually
output 2. You are prompted for the output number to setup. Press the output number
followed by ENTER.

OUTPUT NUMBER:03

USE THUMBWHEEL

Use the thumbwheel or up/down speed buttons to scroll through the different lighting
effect options. Press ENTER when you get the one you want.

DIR OF OPERATION

1=FW 2=RV 3=BOTH

Next press 1,2 or 3 to select the ‘directionality’ of the output. If you want the output
active only in the forward direction of travel - press 1. Press 2 for the effect to
operate only when travelling in reverse. 3 activates the output no matter which
direction the locomotive is travelling.

REGULAR BULB OR

LED 1=BULB 2=LED

Last, press 1 if the output has a regular incandescent bulb attached. Press 2 if the output
has an LED connected. LEDs behave differently when dimmed than incandescent bulbs.
Pressing 1 or 2 informs the decoder which set of lighting characteristics to use for this
output.

QSI PROGRAMMING (Option 8)

QSI sound decoders use indexed programming of CV51,CV52,and CV56. You are
asked for an index number before you are asked for the CV value. CV49 is then
automatically set with the index value before the original CV is set with the desired
data.
When programming CV56 you are asked for primary and secondary index numbers
before you are asked for the CV value. CV49 and CV50 are then automatically set
with the index numbers before CV53 is set with the desired data.
All other CV’s are programmed in the normal manner.

BINARY CV PROGRAMMING (Option 9)

Use this option if you need to build up the value for a CV bit-by-bit. Enter the CV
number you wish to program.

BIN PROG 02:10AM

ENTER CV NUM: _

Then press bit number (top line of LCD has bit numbers) to toggle the corresponding
individual bits on the lower line of the LCD that make up a binary byte. In the example
below the 1, 3 and 7 keys have been pressed to set the corresponding bits in the
byte. To set the value of a bit back to 0 press the bit number again.

CV: 060 76543210

BITS: 10001010

When you get the value built up to the number you desire, press ENTER to program
the CV.

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