OPERATING MANUAL COMMAND STATION MX10 Page 19
The meaning of the parameters in the “VOLT & AMPERE Detail Settings“,
for 1: (track-1) and 2: (track-2)
Track voltage Range 10 V - 24 V Default 16 V
The target output voltage for track-1 or track-2. This voltage is maintained within 1 V; if this is not
possible, the track power is turned off “UNV” (UNnder Voltage, usually due to a weak power supply).
Start-up current Range 0.5 A - 16 A Default is set equal to OVC threshold
When powering up the track (system start up or after a short circuit), the “start up current” applied
during the “start up time” (see below) is higher than the one defined at the “overcurrent threshold”,
which allows the back-up capacitors in the locomotives on the layout to be charged. The inrush current required for this is in the range of 100 – 300 mA for vehicles fitted with capacitors according to
standards, for non-compliant vehicles the current may often be much higher.
Start-up time Range 0 sec - 60 sec Default 0 sec
The “start up current” (see above) is applied to the track output for the time specified here when pow-
ering up the track. This limitation can force a reduction of the track output voltage (which rises slowli-
er); the shutdown due to low voltage is disabled for this reason.
OVC threshold Range 1 A - 12 A Default 5 A (Track-1), 3 A (Track-2)
OVC = Overcurrent. The current at the track outputs shall be limited to the “OVC threshold” defined
here (provided the adaptive threshold current does not result in an even lower limit, see “OVC adaptive”); the output shall be switched off after the “OVC turn off time” is reached (see below). The only
exception is the “Tolerance current” (see parameter below), which may be higher during the “Toler-
ance time”.
OVC Turn-off time Range 0.1 sec - 5 sec Default 0.2 sec
When the current threshold is exceeded (either relatively acc. to “OVC adaptive” or absolutely specified in the “OVC threshold”), the track output is first limited to the constant current threshold, leading
to a forced reduction of the track voltage. After the “OVC turn-off time” defined here has elapsed –
and the overcurrent condition persists – the track output is turned off. The turn-off time permits i.a.,
that momentary shorts due to wrongly polarized frogs are being ignored.
OVC Adaptive Range 0.1 A - 6 A Default 2 A
Whereas the uppermost current on the outputs is defined by the “OVC threshold”, the “OVC adaptive”
defines how big sudden increases in the current consumption may be. Huge increases shall lead to a
shutdown, independent from the absolute limit.
OVC Adapt. time Range 1 sec – 10 sec (at least 5 x the turn-off time) Default 2 sec
The extent of the “OVC Adapt.” current step is the difference between the higher curr. and the average current in the time before. The average value is created during the “OVC Adaptive time”. This
setting should not be changed.
OVC Tolerance current Range 0 A - 6 A Default 0 A
The “OVC threshold” (max.allowable track power, see above) may be exceeded by the defined “OVC
tolerance current” for the specified “OVC tolerance time” (below). The shutdown occurs thereafter by
applying the turn-off time (as described above).
OVC Tolerance time Range 0 sec - 60 sec Default 0 sec
See description above (OVC Tolerance current).
Spark suppression Range OFF - LEV 1 – LEV2 Default LEV 2
Special electronic circuitry in the track output end stages ensure that no big sparks can occur in a
short circuit situation (i.e. between wheel and rail when driving over frogs or during derailments), despite the high output currents.
The meaning of the parameters in the “VOLT & AMPERE Detail Settings“,
for PROG: (track-2 as programming track)
SERV: Track power Range 10 V - 24 V Default 12 V
Target output voltage for track-2 during a programming procedure in Service Mode (SERV PROG);
In driving mode, the operating voltage setting for track-2 (“2:”) is valid.
SERV: OVC Threshold Range 400 mA, 1 A - 8 A Default 400 mA
OVC = Overcurrent. The current at the track output (track-2 in Service Mode) shall be limited to the
“OVC threshold” defined here.
The “400 mA” setting essentially corresponds to the relevant standard of the “Rail Community”
(VHDM) RCN-216: The power consumption is limited to this relatively low value, and a subsequent
check is made after 150 msec to see whether the current has fallen to 100 mA. The programming
procedure will continue only if this condition is met, otherwise the track power is turned off. This is a
security measure for traditional programming tracks, to prevent overheating and subsequent damage caused by wrong decoder connections.
When set to 1A…: no specific time-dependent limits apply; the current is limited to 300 mA to dampen the acknowledgment pulse (so that the engine does not “jump”) while waiting for a decoder acknowledgment.
SERV: OVC Turn-off time Range 0.1 sec - 5 sec Default 0.1 sec
See track-1 and track-2 description for details. This value is very short by default because there are
normally no turnouts (with possible shorts caused by a frog) in a programming track.
Upd: Track voltage Range 10 V - 24 V Default 12 V
Target voltage at output track-2 during an update or sound upload procedure; in driving mode the
operating voltage setting for track-2 ("2:“) is valid.
Upd: OVC Threshold Range 1 A - 8 A Default 3 A
OVC = Overcurrent. The current at the track output shall be limited to the “OVC threshold” defined
here.
Upd: OVC Turn-off time Range 0.1 sec - 5 sec Default 0.1 sec
See track-1 and track-2 description for operational details. This value is very short by default because there are normally no turnouts (with possible shorts caused by a frog) in a programming track.