Power supply via trailing cable - SmartRelay 3 system
This connection option does not access existing lift electronics. This means the lift electronics remain intact and a new inspection may be avoided.
The components are powered via the trailing cable only. The required power supply unit is at the other end of the trailing cable. Depending on the length of the trailing cable, a possible voltage drop must be taken into account to meet specifications (see Properties).
IMPORTANT
Malfunctions due to voltage drop
The physically induced voltage drop in the trailing cable may cause low voltages in power supplies which come from outside the cab.
- Take the cable length into account.
- Switch to a version with power supply in the cab if necessary (see Common earth with power supply and Common earth with SREL3 components).
- Make the cable gauge larger by merging lines in the trailing cable.
Insert: Reader with SmartOutput module and common supply
The SmartOutput module requires its own power supply. The reader can also be connected to this power supply. Six free lines are required in addition to the existing lines.
Line | Use |
|---|---|
1 | Earth connection between controller, reader and SmartOutput modules |
2 | Positive terminal on the power supply |
3 | Controller – reader Data line A |
4 | Controller – reader Data line B |
5 | Controller – SmartOutput module: Data line A |
6 | Controller – SmartOutput module: Data line B |
NOTE
The power supply unit for the reader and the SmartOutput modules can be omitted if the controller power supply unit can deliver sufficient electricity and supply a voltage of 12 VDC.
See Power supply through trailing cable and Connecting one or more readers on wiring.
Insert: Reader without SmartOutput module
The controller powers the reader. An additional power supply unit is not required. Four free lines are required in addition to the existing lines.
Line | Use |
|---|---|
1 | Earth connection between controller and reader |
2 | Positive terminal on the power supply |
3 | Controller – reader: Data line A |
4 | Controller – reader Data line B |
See Power supply through the controller on wiring.
Insert: Controller-fed reader with SmartOutput module
The controller powers the reader. Connected SmartOutput modules are powered via an additional power supply unit at the other end of the trailing cable. Nine free lines are required in the trailing cable in addition to the existing lines.
The reader and its connection to the controller do not need to be removed. This means it is possible to retrofit SmartOutput modules to an existing connection.
Line | Use |
|---|---|
1 | Earth connection between SmartOutput module and power supply unit |
2 | Positive terminal for power supply between SmartOutput module and power supply unit |
3 | Earth connection between controller and reader |
4 | Positive terminal for power supply between controller and reader |
5 | Controller – SmartOutput module: Data line A |
6 | Controller – SmartOutput module: Data line B |
7 | Controller – SmartOutput module: Data line earth connection |
8 | Controller – reader Data line A |
9 | Controller – reader Data line B |
See Controller-fed reader with SmartOutput modules and Connecting one or more readers on wiring.