Digitrax PM74 Handbuch - Seite 7

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7.0 Programming PM74 CVs:

As for section 6.0, a suitable DT602 is required. Press the; Menu>2>1 keys to

enter Operations Mode programming.

Press the F soft key "SWITCH" to enter

the "Ops Switch" mode CV program-

ming screen, as shown adjacent.

This example screen shows CV# 11

selected by the numeric keys for a PM74

with BASE address of SW0001.

Use the LH and RH encoder knobs to

select the base DS/SW# of the Series7

device that you wish to modify a CV on.

The PM74's CV11 to CV16 access 48

OPSW bit settings. CV11 bit0 is OPSW1.

For example; with CV11 selected, press

the B or "CVDATA" soft key to change to

CV data entry.

Press the number 3, then press "WRITE"

soft key. This now configures CV11 or

OPSW1-8 bits to 3, making OPSW1 and

2 =C,. This changes DS1 and DS2 to Auto-reverse. A value of 00 in CV11 will

return OPSW1-8 to factory default.

Be careful changing the values in CV11,12,13,14,15 and CV16 since the 8 bit

data value 0-255 in these CV's actually each control 8 individual OPSW bits.

On a successful READ attempt the CV data number will turn GREEN.

The DT602 does not indicate to the PM74 when programming is complete,

so after you have finished CV changes, best practice is to POWER cycle the

PM74. Alternately, you can WRITE CV7 to 00 to restart that PM74.

.0 Set up Notes:

Wiring resistances Za and Zb are shown in the FA and FB feeders to signify

the effect of combined wire losses. These become critical if the bus and/or

feeder wires are too small, which limits the available fault current. This may

cause fault detection to be unreliable or ineffective. Best practice is to use

e.g. 12AWG to 16AWG feeder bus wires from the Booster terminals to e.g. the

RA/RB power input terminals of the DS74. Most common issues are due to;

excessive wiring resistance, an incompatible booster with insufficient DCC

output, or low DC power input to allow an adequate fault current.

A PM74 will operate on DCC 2-pin track power without DC power input to

the 2mm jack, but control may fail due to track power interruptions from

complex fault sequences. Also, the total PM74 run and startup current will

subtract from the Booster current available for mobile/locomotive decoders

in that Booster Power District.

A PM74 can operate with just DCC track power on 2-pin terminals and no

LocoNet cable, but it will not have LocoNet reporting features available.

DCC track current is widely varying due to combined time changes of; motor,

lights, sound and inrush currents, so a fault trip threshold has to allow nor-

mal operations but be low enough to activate correctly on a fault.

CV Program Menu A:

Ops Switch ADR: 0001

CV Number:

CV data:

CVNUM

— 7 —

LOCO

0011

0003

CVDATA

DONE