The Control Unit performs closed-loop control functions for the inverter. In addition to the closed-loop control, it has additional functions that can be adapted to the particular application through parameterization. The CU240D?2 Control Units supersede the CU240D Control Units, whereby both versions can be operated with PM250D Power Modules.

CU250D?2 Control Units can be used to implement applications with positioning requirements in the drive. This expansion opens up their use in lifting, swiveling, traversing or rotating applications. The positioning functionality is comparable to that of SINAMICS S110 servo drives.
Two points must be noted in this context:

• Vector control (VC) and sensorless vector control (SLVC) are possible (but not servo control)
• Positioning using one encoder (HTL/SSI) or using two encoders simultaneously (HTL and SSI)

Control Units are available in different versions:

• CU240D-2 DP
• CU240D-2 DP-F
• CU240D-2 PN
• CU240D-2 PN-F
• CU240D-2 PN-F PP (Push Pull)
• CU240D-2 PN-F FO (fiber optic)
• CU250D-2 DP-F
• CU250D-2 PN-F
• CU250D-2 PN-F PP (Push Pull)
• CU250D-2 PN-F FO (fiber optic)

The Push Pull version comprises an alternative connection method for the 24 V DC supply voltage and the PN communication.

CU240D-2 DP Control Unit

CU240D-2 PN Control Unit

CU250D-2 DP-F Control Unit

CU250D-2 PN-F Control Unit

CU250D-2 PN-F PP and CU250D-2 PN-F FO Control Units

Safety Integrated functions

The safety function "Safe Torque Off" (STO) (certified according to IEC 61508 SIL 2, EN ISO 13849?1 PL d and Category 3) is already integrated into the standard versions of the CU240D?2 series (CU240D?2 DP and CU240D?2 PN). It can be activated either over PROFIsafe or over the safety input.

With the fail-safe variants of the CU240D?2 series (CU240D?2 DP?F xx and CU240D?2 PN?F xx) and with the entire CU250D?2 series, the fail-safe SINAMICS G120D inverter provides five safety functions which are certified according to IEC 61508 SIL 2, EN ISO 13849?1 PL d and Category 3:

• Safe Torque Off (STO)
  to protect against active movement of the drive
• Safe Stop 1 (SS1)
  for continuous monitoring of a safe braking ramp
• Safely Limited Speed (SLS)
  for protection against dangerous movements on exceeding a speed limit
• Safe direction (SDI)
  This function ensures that the drive can only rotate in the selected direction.
• Safe speed monitoring (SSM)
  This function signals if a drive is operating below a specific speed/feed velocity.

These functions can be activated by means of PROFIsafe or via the safety inputs. A safety output is provided in addition.

None of the safety functions require a motor encoder and they are thus much cheaper and easier to implement. Existing systems in particular can be simply updated with safety technology without the need to change the motor or mechanical system.

The Safe Torque Off (STO) function can be used without restriction for all applications. The SS1, SLS, SSM and SDI functions are only permissible for applications where the load can never accelerate when the inverter is switched off. They are therefore not permitted for applications involving pull-through loads such as hoisting gear and unwinders.

Additional information is provided in chapter Highlights, section Safety Integrated.

Selection and ordering data

Note:

An external 24 V DC power supply is required in order to operate the Control Unit. For information about suitable connecting cables, refer to section "Supplementary system components", connecting cables/plug-in connectors for supplying 24 V DC to the Control Unit.

Optional firmware memory cards

For more information on firmware V4.6:

http://support.automation.siemens.com/WW/view/en/67385235

For more information on firmware V4.7:

http://support.automation.siemens.com/WW/view/en/92554110

Additional information on firmware V4.7 SP6 HF1:

http://support.automation.siemens.com/WW/view/en/109482094