ETS Praha spol. s r.o. - Electric Train Systems
Driving Units
At the heart of every locomotive is its driving unit, made up of a DC electric motor with permanent magnet and five-pole rotor. Consumption is between 0.3 and 0.6 amp depending on the running speed and load. Some locomotives - for example the 140 series - have two driving units. The worm gear transmission from the motor to the driving wheels is equipped with a patented automatic clutch to disconnect the gear from the driving wheels whenever the motor is stopped. This allows the driving wheels to spin freely when the locomotive is pushed along the track by hand. The earlier locomotives 101, 111, and 113 utilize a driving unit with spur gear transmission from the motor to the driving wheels, with consumption in the range 0.4 to 0.8 amp. Our locomotives are designed to run on two-rail track with the ETS impulse controlled DC power supply. However since the model year 1996, all models have been designed to also be run on plain DC current with a voltage between 0 and 16V. All models can also be supplied modified for three-rail track operation in AC or DC, with change of direction either after stopping (USA and European standard) or after a 20V impulse (European standard).
Sound Generators
Almost all of our models can be equipped with an electronic sound generator to simulate the sounds of a steam, diesel or electric locomotive as appropriate, and also a remotely controlled whistle. The engine sounds are synchronized with the speed of the locomotive, and different whistle sounds were chosen for each type of locomotive.
Whistle
The whistle sounds only when an ETS power supply is used, being activated by a change in the frequency of the power impulses while their width remains constant. Thus sounding the whistle does not affect the locomotive's speed. When using a different power supply, the switch on the driving unit should be moved to the unlabelled position to turn off the sound generator.
Power Supply Units:
While locomotives without the electronic sound generator can be operated on any power supply, those with it require an ETS power supply unit, which also ensures that the locomotive moves smoothly and that the lights have constant brightness even at the slowest speeds.
We produce a number of power supply units:
702 Impulse DC power supply for 220V/50Hz with a circuit breaker and whistle control button and with AC output for accessories (switches).
702A As 702, but for 110V/60Hz..
703 Impulse DC power supply for 14-20V/50-60Hz. This adapter is for use with any existing AC power supply that delivers 14-20V AC, and is designed especially for countries where our mains adapters are not yet certificated.
Speed
Each unit in the 700 series delivers short DC impulses of about 18V. Varying the pulse width while keeping the voltage constant controls the speed of the locomotive - the longer the pulse width, the greater the speed. This system means the locomotive is using the full force of its motor at all speeds, ensuring smooth and powerful motion.
Lights
All locomotives have lights that automatically switch with the travel direction and stay lit when the train has stopped, powered by a constant stream of very short pulses. When the speed control is set to zero an inductor filters these short pulses so that the locomotive remains stationary. If the locomotive were operated from a regular (non-impulse) power supply, the inductor would slow the locomotive down. Therefore each driving unit has a switch that should be in the "ETS" position only when an ETS power supply is in use, so that the inductor is engaged.
At the heart of every locomotive is its driving unit, made up of a DC electric motor with permanent magnet and five-pole rotor. Consumption is between 0.3 and 0.6 amp depending on the running speed and load. Some locomotives - for example the 140 series - have two driving units. The worm gear transmission from the motor to the driving wheels is equipped with a patented automatic clutch to disconnect the gear from the driving wheels whenever the motor is stopped. This allows the driving wheels to spin freely when the locomotive is pushed along the track by hand. The earlier locomotives 101, 111, and 113 utilize a driving unit with spur gear transmission from the motor to the driving wheels, with consumption in the range 0.4 to 0.8 amp. Our locomotives are designed to run on two-rail track with the ETS impulse controlled DC power supply. However since the model year 1996, all models have been designed to also be run on plain DC current with a voltage between 0 and 16V. All models can also be supplied modified for three-rail track operation in AC or DC, with change of direction either after stopping (USA and European standard) or after a 20V impulse (European standard).
Sound Generators
Almost all of our models can be equipped with an electronic sound generator to simulate the sounds of a steam, diesel or electric locomotive as appropriate, and also a remotely controlled whistle. The engine sounds are synchronized with the speed of the locomotive, and different whistle sounds were chosen for each type of locomotive.
Whistle
The whistle sounds only when an ETS power supply is used, being activated by a change in the frequency of the power impulses while their width remains constant. Thus sounding the whistle does not affect the locomotive's speed. When using a different power supply, the switch on the driving unit should be moved to the unlabelled position to turn off the sound generator.
Power Supply Units:
While locomotives without the electronic sound generator can be operated on any power supply, those with it require an ETS power supply unit, which also ensures that the locomotive moves smoothly and that the lights have constant brightness even at the slowest speeds.
We produce a number of power supply units:
702 Impulse DC power supply for 220V/50Hz with a circuit breaker and whistle control button and with AC output for accessories (switches).
702A As 702, but for 110V/60Hz..
703 Impulse DC power supply for 14-20V/50-60Hz. This adapter is for use with any existing AC power supply that delivers 14-20V AC, and is designed especially for countries where our mains adapters are not yet certificated.
Speed
Each unit in the 700 series delivers short DC impulses of about 18V. Varying the pulse width while keeping the voltage constant controls the speed of the locomotive - the longer the pulse width, the greater the speed. This system means the locomotive is using the full force of its motor at all speeds, ensuring smooth and powerful motion.
Lights
All locomotives have lights that automatically switch with the travel direction and stay lit when the train has stopped, powered by a constant stream of very short pulses. When the speed control is set to zero an inductor filters these short pulses so that the locomotive remains stationary. If the locomotive were operated from a regular (non-impulse) power supply, the inductor would slow the locomotive down. Therefore each driving unit has a switch that should be in the "ETS" position only when an ETS power supply is in use, so that the inductor is engaged.
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