MRC 1651 User manual

MRC 1651
4-FUNCTION DECODER
with MRC Light Effects
Built-in NMRA DCC & 9-pin plug
Thank you for purchasing our highly advanced DCC locomotive
decoder. Combined with any DCC System, our decoder will
make your model railroad more realistic and more exciting.
•Adjustable back EMF load control with ultra slow
speed control
•Built-in NMRA DCC plug and 9-pin plug
•Maximum current: 1.5 Amp
•Programmable for either 2-digit (1-127) or
4-digit (1-9999) addresses
•Programmable start voltage and top voltage
•Programmable acceleration rate and deceleration rate
•Programmable 14, 28, or 128 speed steps
•Directional lighting at 0.1 amp rate
•Easy setting “Rule 17” lighting, ditch, strobe and
Mars lights
•2 accessory functions (ACC1 & ACC2), at 0.1 amp
rate
•Supports advanced consisting, (CV19)
•Supports programming on main
•Supports full read back
•Compatible with NMRA DCC standard
•Complies with the Part 15 of FCC
•19.30mm long x 17.0mm wide x 5.0mm high
BACK EMF LOAD CONTROL (PID CONTROLLER)
This decoder is equipped with adjustable back EMF closed loop speed
control. Its proportional gain (CV113), integral gain (CV114) and derivative
gain (fixed) are pre-tuned for most locomotives. We recommendend that
you do not change these settings. Too much gain may cause the motor to
oscilate (become unstable). Too little gain may cause slow reponse.
Please get some basic knowledge of PID feedback control before trying to
adjust CV113/114.
With back EMF load control the locomotive will maintain its speed regard-
less of pulling up hill or driving down hill.You may program the back EMF
load control intensity, CV124, to a lower value to get less back EMF load
control. This will enable the locomotive to slow down during uphill travel.
FCC COMPLIANCE
This device complies with the Part 15 of FCC rule. Operation is subject to
the following two conditions. (1) This device may not cause harmful interfer-
ence, and (2) this device must accept any interference received, including
interference that cause undesired operation.
TROUBLE SHOOTING
Whenever you find the decoder doesn’t work properly please clean your
track and the loco’s wheels. And reprogram loco address or program
CV125 with a value of 1 to restore factory defualt setting. Your decoder may
simply lose its memory. All you may need to do is to reprogram its ad-
dress.
RETURN PROCEDURE
This decoder carries a 6 month warranty against factory defects. This
warranty does not include abuse, misuse, neglect, improper installation,
or any modifications made to this decoder, including but not limited to the
removal of the NMRA plug if applicable. If it should become necessary to
return the decoder for warranty repair/replacement, please include a copy
of the original sales receipt. Please include a letter (printed clearly) with
your name, address, daytime phone number, and a detailed description of
the problem you are experiencing. Please also include a check or a money
order for $11.00 to cover return shipping and handling. If the decoder is no
longer considered under warranty, then please contact Model Rectifier
Corp. for a price quote to cover the cost of repair or replacement of the
decoder, and return shipping and handling. Customers outside the
continental United States, including:Hawaii, Alaska, Canada and Mexico,
have to contact MRC for exact return shipping rates for both warranty and
non-warranty repairs. Contact [e-mail]. Be certain to
return the decoder only. Any questions regarding Warranty Policy can
be directed to our Customer Service Department by calling 732-225-
6360 between the hours of 8:30am and 6:00pm EST, or by emailing:
[e-mail]
Send the decoder to:
Model Rectifier Corporation
Attn: Parts & Service
80 Newfield Avenue
Edison, NJ 08837-3817 U.S.A
PROGRAMMING
This decoder supports all program modes and read back features. With MRC Prodigy
Advance² DCC you can read its address and CV values.
Please refer your DCC manual to learn how to program CV. See the regis-
ter/CV chart to custom tailor your MRC Light Effects. For a more compre-
hensive understanding of CVs and registers. visit the National Model Rail-
road Association website at www.nmra.org.
CV Register Description Range Default
CV1 R1 Short address 1-127 3
CV2 R2 Start voltage 0-32 0
CV3 R3 Acceleration 0-32 0
CV4 R4 Deceleration 0-32 0
CV5 --- Top voltage 0-32 32
CV29 R5 Basic configuration --- 2
CV7 R7 Manufacturer version number --- 32
CV8 R8 Manufacturer ID --- 143
CV17 --- Long address upper byte 192-231 192
CV18 --- Long address lower byte 0-255 3
CV19 --- Advanced consist address 0-127 0
CV65 0-63 63
CV67-94 1-255 linear
CV105 --- User identification number 0-255 0
CV106 --- User identification number 0-255 0
CV113 0-31 20
CV114 0-31 10
CV117 0-2 0
CV118 ACC1 light type control (green wire) 0-5 0
CV119 ACC1 light type control (pink wire) 0-5 0
CV121 Ditch flash (=1) or stayon (=0) 0-1 0
CV124 0-255 160
CV125 --- Factorydefault setting: Program it to 1
will restore all the CV to defult setting --- 0
0
When CV21=0, all accessory function
will follow its own address. When
CV21=1, all functions will follow the
consist address
0-1
Back EMF Load control proportional gain Kp
28 speed steps table while CV29.4=1
kick start voltage
CV21 ---
Back EMF Load control integral gain Ki
Back EMF Load control intensity (0=off)
0 for directional, 1 for rule 17, 2 for bright and dim

INSTALLATION
If your loco has an NMRA DCC 8 pin socket or 9 pin plug, all you need to do
is plug in the decoder. Otherwise you have to cut the 8 pin plug and wire in
the decoder. It is quite a challenge to install a decoder into a locomotive
without the DCC socket. You should have some basic electrical knowledge
and soldering skills. If you do not have the above requirements, please ask
the dealer for help in installation.
Figure 1 shows the electrical circuit of most standard locomotives. The
terminals of the motor and lights are directly connected to the wheel pick-
ups. Each type of loco has its own method of electrical pickup. The con-
nection between wheel and motor/light could be wires, clips, the body or
any conductor. Figure out your locomotive’s electrical connection and how
to disconnect (isolate) the motor and lights. The decoder will be inserted
between the wheel pickups and the motor. The ‘X’ marks in Figure 1 show
you where to disconnect.
Figure 1. Connection of a standard locoNote: The ‘X’ signs indicate
where to disconnect (isolate)
Figure 2 shows you how to wire the decoder. After disconnecting the motor
terminals from pickups, connect the red wire to the right side pickup and
the black wire to the left side pick up. Connect the orange wire to the motor
terminal that originally connect to the right pickup. Connect the gray wire to
the motor’s other terminal. Connect the front light to the blue wire and the
white wire. Connect the rear light to the blue wire and the yellow wire.
The blue wire is the common terminal for headlights (white for front and
yellow for rear) and accessory functions (green for ACC1 and pink for
ACC2). You may use the black wire or the red wire to replace the blue wire.
This is very useful when you find that it is hard to isolate one of the light
terminals from the pickup. Wiring the bulb this way will also make the light
dimmer. If your loco has only a front light, you should connect the white
and the yellow wires together.
TEST
All MRC decoders have been factory programmed with address #3, 28/128
speed steps and maximum top voltage. After you have finished your de-
coder installation, you are ready to test it. Never run the installed decoder
on your layout without first passing the test. You may damage the de-
coder if it is not wired correctly or if you have not properly isolated the motor
and the lights.
Put the loco on the test track. Select the Run Mode of your DCC system and
select or acquire address #3. Move up throttle and the loco should move
forward. Push the light button and the front light of your loco should turn on.
Push the reverse direction button. The loco should move backward and the
rear light should turn on. The loco cannot get to normal speed because
there is a 20 ohm protection resistor in the test track. If you are able to turn
on/off the front and rear lights and you are able to move the loco in forward
and reverse, you did a great job. Congratulations! Do not test the loco on
the test track for an extended period of time. To do so will cause the
protection resistor to overheat.
MAKE A TEST TRACK
Before you start with your decoder installation, we strongly recommend
building a test track which uses a 20 ohm resistor to limit current. Only test
your installed decoder on the test track. The test track will prevent any
damage due to an incorrectly wired decoder.
Figure 3. Diagram of test track
OPERATION
Headlight
There are three ways to operate headlight (depends on CV117):
1. Normal directional lighting (CV117=0)
2. Rule17 lighting (CV117=2). One light is bright to indicate direction
of travel, the other is dim.
3. Dim, bright, off cycle (CV117=1). Use F4 toggle between bright and
dim.
Note: If you loco’s headlight has dim function, you should program
CV117 to 1. And use F0 to turn on or turn off the headlight and use F4 to
control it dim or bright.
ACC1 & ACC2 LIGHT EFFECTS
There are two function output wires (green and pink) on the decoder.
Their functions are controlled by CV118 (green) and CV119 (pink). See
the CV118&CV119 chart. To turn on/off ACC1&ACC2 use F3.
Note: Ditch lights will use two lights. Both CV118 and CV119 must be
programmed to 0. Ditch lights flash when F2 is on. When F3 is on and
CV121=0 ditch light stead on. When F3 is on and CV121=1 ditch light
flash.
SPEED TABLE CV67-CV94 FOR 28 SPEED STEPS
When CV29’s bit 4 is set to “1” it will use the speed table formed by
CV67-CV94 to control speed (motor voltage). It allows you to setup each
speed for all 28 speed steps. First, program CV29 to 18 for short
addresses (1-127) or program CV29 to 50 for long addresses (128-
9999) to enable speed table control. Then select throttle to 28 speed
steps and run your loco at speed step 1. Use program CV on the main
to change CV67’s value (1-255) to adjust step 1’s speed. The kick
voltage, CV65 is only applied when the speed step changes from 0 to 1.
You should switch between 0 to 1 many times to check step 1’s speed.
When done with CV67, select speed step 2 and program CV68. CV68’s
value must be greater then CV67’s. When done with CV67-CV94, use
read back CV to make sure their values are in increasing order.
Note: When using MRC Prodigy DCC to program addresses it will
automatically disable the speed table (set CV29’s bit 4 to “0”).
Programming CV125 to 1 will also disable the speed table and re-
program CV67-CV94 to a default linear speed setting.
If your installed decoder does not pass the test, find the problem, cor-
rect it and test it again. As long as you test the decoder on the test track
there is little chance of damaging your decoder. This is why making a
test track is so important.
Right side
Front Motor Rear
Left side pickup
X X X
XX
X
Figure 2. Decoder wiring diagram
black
white
left
orange
gray
Motor
blue
red
yellow
rear light
front light
green
right
pink
ACC1 light
ACC2 light
DCC base unit
Power supply
Test track
20 ohm resistor
NMRA DCC plug
green wire
pink wire 9-pin plug
Green wire Pink wire
CV112 CV113
Ditch 0 0
Gyra 1 1
Mars 2 2
Prime Strato 3 3
Single Strobe 4 4
Double Strobe 5 5
On/off 6 6
Light Type