Option L37 (Dc Interface Incl. Precharging Circuit); Option M59 (Closed Cabinet Doors) - Siemens SINAMICS G130 Engineering Manual

9.8

Option L37 (DC interface incl. precharging circuit)

This option is available for SINAMICS S120 Cabinet Modules (only for air-cooled units, but not for liquid-cooled
units).
Option L37 (DC interface incl. precharging circuit) is useful for applications which require individual Motor Modules to
be disconnected from or reconnected to the DC busbar during operation without powering down the entire drive
system. The option includes a precharging circuit to precharge the DC link of the Motor Module to be connected. It is
activated automatically when required.
A manually operated fuse-switch disconnector is used for S120 Cabinet Modules with Motor Modules in Chassis
format. The switch provided with option L37 is extremely compact and features an innovative operating system,
making it particularly simple and reliable to handle.
A contactor assembly with identical operating principle to the manually operated fuse-switch disconnector described
above is used for S120 Cabinet Modules with Booksize Cabinet Kits.
Freely configurable switch-position signaling contacts make it easier to integrate option L37 into the plant monitoring
system. Switching operations can be monitored in this way, but also configured to trigger other processes.
If a Motor Module is ordered with a Control Unit and a DC interface as options, the connection between the Control
Unit and the fuse-switch disconnector / contactor assembly for switching operation monitoring will be pre-wired at the
factory. If the relevant Control Unit is located in a different Cabinet Module or another transport unit, the connection
must be made on site via the standard interface.
Operating principle
The option L37 has a switching lever in the door which has three actuation levels with two switch positions.
·
Switch position 0:
·
Switch position 1:
When the ON command or pulse enable is issued for Motor Modules in Chassis format, the switch changes
automatically to the third level and connects the power unit directly to the DC busbar. In the case of Motor Modules of
Booksize Cabinet Kits, a time relay performs this function and thus establishes a direct connection to the DC busbar.
For disconnecting the DC interface, the switching lever is directly switched from position 1 to position 0 without
involving the precharging circuit. The risk of operating errors is thus excluded.
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 disonnector in position 1, the cabinet door
cannot be opened, or opened only with a special tool.
The following options are not compatible with option L37:
·
Option L61 / L62 (Braking units for mounting in the power blocks of Motor Modules)
9.9

Option M59 (Closed cabinet doors)

This option is available for SINAMICS S120 Cabinet Modules (only for air-cooled units, but not for liquid-cooled
units). Closed doors are included with option M55 (IP55) for liquid-cooled S120 Cabinet Modules.
If the Cabinet Modules are erected on a false floor or duct they can take their cooling air directly from the bottom. In
this case the Cabinet Modules can be ordered with closed cabinet doors.
The customer must ensure on site that no dirt / dust or moisture can enter the Cabinet Module. If the area underneath
the Cabinet Modules can be accessed, the customer must provide shock-hazard protection.
To ensure an adequate air-inlet cross-section, the units are shipped without the standard base plates. Cables must
not be routed in such a way that they impede the air inlet through the cabinet floor openings.
It is essential to meet the relevant cooling air requirements as defined in section "Dimensioning and selection
information" of chapter "General Information about Modular Cabinet Units SINAMICS S120 Cabinet Modules".
OFF - switching contacts are open.
Precharging - precharging resistors are connected in.
The DC link is precharged in the lever position 1.
SINAMICS Engineering Manual – November 2015
Description of Options
Engineering Information
Ó Siemens AG
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