13
Functions
● For optional operation with a conventional
DC power pack, Trix Selectrix, or Digital systems
conforming with the NMRA standards (DCC).
● The mode of operation is automatically recognized.
● Particularly smooth control of running charac-
teristics.
● Particularly quite motor operation.
● Different control variables for optimal adaptation
to the motor.
● 127 speed levels internally.
● Block operation with simple diodes in Selectrix
operation.
● Short circuit protection for the motor outputs.
● Overload protection for lights and auxiliary function.
● Electronic interchangeability of the connections.
● NEM 650 connector.
● 4-Pole SUSI connector for hooking up to
3 expansion modules in DCC operation.
Technical Specifications
● Dimensions (L x B, without connections)
24.2 x 15.4 mm / 19/20” x 3/5”
● Max. load at the motor outputs ≤ 2.0 amp
● Max. load at the light outputs ≤ 300 milliamps
● Max. load for auxiliary function ≤ 50 milliamps
● Max. total load ≤ 1.0 amp
● Function output, lights ≤ 300 milliamps
● Function output, horn ≤ 50 milliamps
● Total load, including
SUSI connector ≤ 2.0 amp
Care and Maintenance
The 66837 decoder does not require any special
care and maintenance. Controlling the motor with
pulse width electronics will however create a higher
load for the windings and the brushes for the motor
than with normal DC power operation. For this reason
regular care and maintenance of the motor is a must.
After no more than 50 hours of operation, the entire
locomotive frame including the decoder should be
cleaned. A thorough cleaning should also be done
before the usual lubrication work.
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