SIEMENS
5/19
Siemens D 31 N · March 2016
SINAMICS G120 standard inverters
0.37 kW to 250 kW (0.5 hp to 400 hp)
Control Units
5
■
Overview
CU240B-2 and CU240E-2 Control Units
CU240B-2 DP Control Unit
CU240E-2 DP-F Control Unit
The Control Unit performs closed-loop control functions for the
inverter.
The CU240B-2 and CU240E-2 Control Units are designed as
standard Control Units for all of the usual applications involving
V/f or vector control.
•
CU240B-2 series with basic I/O quantity structure, ideal for a
large number of applications
•
CU240E-2 series with standard I/O quantity structure and
integrated safety technology
The CU240B-2 and CU240E-2 Control Units can be combined
with the following Power Modules:
•
PM230 degree of protection IP20
1)
• PM240-2
• PM240
• PM250
Note:
Shield plates and shield connection kits are available. These can
be used in the wiring installation for the Control Units and Power
Modules to ensure that it complies with EMC guidelines.
For more information about shield connection kits and shield
plates for Control Units and Power Modules, please refer to
section "Supplementary system components".
Safety Integrated functions
The safety function "Safe Torque Off" (STO) (certified according
to IEC
61508 SIL
2 and EN ISO 13849-1 PL d and Category 3) is
already integrated into the basic versions of the CU240E-2
series (CU240E-2, CU240E-2 DP, CU240E-2 PN).
With the fail-safe variants of the CU240E-2 series (CU240E-2 F,
CU240E-2 DP-F, CU240E-2 PN-F), the fail-safe SINAMICS G120
inverter provides five safety functions which are certified
according to IEC 61508 SIL 2 and 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 when a speed
limit is exceeded (the CU240E-2 DP-F Control Unit has up to
4 selectable SLS limit values)
•
Safe Direction (SDI)
This function ensures that the drive can only rotate in the
selected direction.
•
Safe Speed Monitor (SSM)
This function signals if a drive operates below a specific
speed/feed velocity (only CU240E-2 DP-F / CU240E-2 PN-F
with PROFIsafe).
These functions can be activated by means of PROFIsafe or via
the safety inputs.
None of the safety functions require a motor encoder and they
are thus much cheaper and easier to implement. Existing sys-
tems 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 restric-
tion for all applications. The SS1, SLS, SDI and SSM 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.
1)
The CU240E-2 Control Unit can also be combined with PM230 Power
Modules with degree of protection IP55.
More information can be found in
Catalog D 35
. A long-distance connector Art. No. 10055500 (ordered from
and supplied by KnorrTec) is required to operate a PM230 Power Module
with degree of protection IP55 in combination with a CU240E-2 Control
Unit and an IOP/BOP-2.
© Siemens AG 2016