Configuration Of Electric Uncouplers - ZIMO MX638 Series Instruction Manual

Page 34 Non-Sound Decoder MX618 - MX638 and Sound Decoder MX640 - MX659
CV #139 = 255: The smoke generator is driven to its maximum under acceleration, which
results in thick smoke.
Synchronized steam chuffs or typical diesel smoke (with exhaust fan):
The heating element of the smoke generator is connected – as in the example above with the
"Seuthe" generator – on FO1...FO8 and configured with the appropriate CV for the desired effect (i.e.
"72" for steam or "80" for diesel). The fan is connected to the function output FO4 (in some decoders
on FO2); see chapter "Installation and wiring".
CV Denomination Range
Use of FO4 as
cam sensor output for
any sound module
#133 0, 1
or
FO4 as exhaust fan of
smoke generators of
steam engines.
Definition of smoke
generator characteristic,
connected to FO1 – 8.
NOT for MX621
PWM at stand still 0 - 255
#137
PWM at steady speed 0 - 255
#138
PWM during accelera- 0 - 255
#139
tion
Exhaust fan speed at
constant speed
#351 1 - 255
For DIESEL engines
Exhaust fan speed at
motor starts and during
#352 1 - 255
acceleration
For DIESEL engines
0 – 255
Automatic smoke
generator shutdown
#353
=
For STEAM and
0 - 106
Default Description
= 0 (Default): FO4 is used as a normal function output
and controlled by a function key, not a cam sensor.
= 1: FO4 is triggered by a cam sensor (synchronously
to wheel rotation), usually for driving an exhaust fan.
This is achieved with either the "virtual" or a real cam
sensor. Also see CV's #267, 268!
0
NOTE: The fan operation is also determined by the
sound project.
NOTE: Large-Scale decoders (which are not subject of
this manual) have special outputs which offer more
setting options for fans.
The values in CV #137 – 139 define a smoke charac-
teristic for the function outputs (FO1 ... FO8; referred
to below as FOx), provided a "smoke function" for a
diesel or steam engine (value 72 or 80) has been se-
lected in the associated CV #127 – 132:
CV #137: PWM of FOx at standstill
0 CV #138: PWM of FOx at cruising speed
0 CV #139: PWM of FOx at acceleration
0 (PWM = Pulse Width Modulation)
The fan speed is adjusted by PWM; the value in CV
#351 defines the effect at steady speed.
128
= 128: Fan is driven at half the voltage at cruising
speed.
The exhaust fan is set to a higher speed (usually top
speed) for generating the typical exhaust puff during
motor starts as well during hard accelerations.
255
= 255: Fan receives maximum voltage at start-up or
accelerations.
If a smoke generator is controlled by one of the effects
"010010xx" or „010100xx" in CV's #127 to 132 (for one
0
of the function outputs FO1 to FO6), the output turns
itself off automatically after the time defined in this CV
DIESEL engines min.
(#354)
Exhaust fan speed at
stand-still
1 – 255
#355
For STEAM and
DIESEL engines

3.24 Configuration of Electric Uncouplers

"System KROIS" and "System ROCO"
When one or two of the function outputs FO1...FO8 (FO1... FO6 with software versions below 34)
are assigned for the uncoupler function (CV #127 for FO1 etc.), the control of the couplers as well as
the entire uncoupling process is defined by the settings in
CV #115 and CV #116.
These CV's limit the pull-in time (to prevent overheating), define a hold-in voltage if required (i.e. Sys-
tem "Roco") as well as the automated coupler unloading and train disengagement.
It is recommended to use the following settings for the Krois system: CV #115 = 60, 70 or 80; these
settings will limit the pull-in time (at full track power) to 2, 3 or 4 seconds respectively. A hold-in voltage
is not required for the Krois coupler and the ones digit can therefore remain at "0".
CV Denomination Range
Uncoupler control
"Pull-in" time
and
"hold" voltage
#115 0 - 99
or use of
CV # 115
for an alternative second
dim value
(dimming 0-90% using ones
digit; tens digit must be 0)
#353, in order to protect the generator against over-
heating.
= 0: no automated shut-down
= 1 to 255: automatic turn-off after 25sec/unit, which
offers a maximum time of about 6300sec = 105min.
See chapter 5.5
Supplement to the settings in CV #133 and the effects
with code "72" (steam engines) or "80" (diesel en-
gines), where the fan is only set-up for chuff beats or
during starts and cruising speeds.
0
With CV # 355, however, the fan speed is adjusted at
a standstill, so that even in this state smoke is dis-
charged (to a lesser extent). The sound must be
turned ON.
Default Description
The uncoupler function is only active if "uncoupler" is
selected (value 48) in one of the CV's #125 – 132,
159, 160:
Tens digit (0 – 9): Time in seconds the coupler re-
ceives full voltage (pull-in time):
0
Value: 0 1 2 3 4 5
seconds: 0 0,1 0,2 0,4 0,8 1
Ones digit (0 to 9): hold-in power in percent of track
voltage, 0 - 90%. Applied after the pull-in time elapsed
(necessary for ROCO coupler, not needed for KROIS
coupler).
6 7 8 9
2 3 4 5