Option L37 (Dc Coupling); Option M59 (Cabinet Door Closed) - Siemens SINAMICS G130 Engineering Manual

Option L37 (DC coupling)

The "DC coupling" option (L37) can be installed for applications where it is necessary to disconnect individual
modules from the DC busbar and reconnect them again without having to power down the entire drive line-up. A
disconnector can be assigned to individual modules.
When the module is reconnected again, the DC link precharging circuit of the relevant module is activated
automatically.
A manually operated switch disconnector is used for power units of the chassis type. The switch provided with option
L37 is extremely compact and features an innovative operating system which makes it particularly simple and reliable
to operate.
A contactor assembly with the same operating system is provided for the Booksize Cabinet Kits.
Freely configurable switch-position signaling contacts make it easier to integrate the option's functions into the plant
monitoring system. Switching operations can be monitored, but also configured to trigger other processes.
If a Control Unit (option K90/K91) is combined with option L37 and assigned to a module, the connection between the
Control Unit and the switch disconnector/contactor assembly for switching operation monitoring will be made in the
factory. If the associated Control Unit is installed in a different transport unit, the connection must be made on site via
the standard interface.
Operating principle
The option has an operating lever in the door which has three actuation levels with two switch positions.
•
Switch position 0:
•
Switch position 1:
When the ON command / pulse enable is issued for the chassis module, the switch automatically changes to the third
level and the power unit is connected to the DC link. This is performed by a time relay on Booksize Cabinet Kits.
When the DC coupling is disconnected, the operating lever is switched directly from position 1 to 0, bypassing the
precharging circuit. Operating errors are impossible.
To provide the greatest possible safety for operating personnel, the switch can be locked in position 0. A lock can be
inserted in the specially provided recess for this purpose. With the switch disconnector version, the cabinet door
cannot be opened when the switch is in position 1, or opened only with an appropriate tool.
Option L37 also includes option M60 (additional shock-hazard protection) for optimized air-flow guidance.
The following options are not compatible with option L37:
•
Option L61/L62 (braking units)

Option M59 (Cabinet door closed)

If the Cabinet Modules are erected on a false floor or duct which forms part of a forced ventilation system, the
modules can be ordered with closed cabinet doors.
In this case, the customer must ensure that no dirt/dust or moisture can enter the Cabinet Module. If the area
beneath the Cabinet Modules can be accessed, the customer must provide shock-hazard protection.
Cables must not be routed in such a way that they impede the air inlet through the cabinet floor opening. To ensure
an adequate air-inlet cross-section, the units are shipped without the standard baseplates.
The cooling air requirements specified in the section "Dimensioning and selection information" must also be noted.
OFF - switching contacts are open.
Precharging - precharging resistor is connected in.
The DC link is precharged in lever position 1.
SINAMICS S120 Cabinet Modules
Engineering Information
SINAMICS Engineering Manual - May 2008
299/396
© Siemens AG