Criteria For The Protection, Line Formation And Monitoring - Siemens SINUMERIK 840D sl Manual

Connection of the Components
5.7 Control Supply Module (CSM)
The Control Supply Module (CSM) is connected to the line supply (3-ph. 380 V AC –10 % up
to 480 V +10 %) via the appropriate screw terminals (0.2 to 4 mm
preferably be made without using an isolating device (e.g. contactor).
The CSM is protected corresponding to the data provided in the Equipment Manual for
Booksize power units. The CSM has an internal line filter (Class A for TN line supplies), and
the pre-charging circuit for the DC link inside the unit is electrically isolated from the 24 V
supply.
Note
When engineering the line supply of the CSM, it should be noted that the CSM may not be
connected to the line supply after the line module is connected to the line supply. When
charging, this prevents the DC link from being immediately loaded by the CSM.
Notice
If a selectively tripping AC/DC-sensitive residual-current circuit-breaker is used, the Control
Supply Module must be connected downstream of this.
5.7.2

Criteria for the protection, line formation and monitoring

Devices and cables must be protected against overload and short-circuit in accordance with
the manufacturer's specifications and appropriate standards.
The primary protection is performed by the device protection of the CSM power supply and
the line protection between the protective device and the power supply.
Recommended circuit-breakers (IEC 898) in the suppy cable can be found in the technical
data in the Equipment Manual for Booksize Power Units. The appropriate cable cross-
section must be considered.
The 24 VDC output circuit of the CSM must normally use an appropriate protection to protect
the device in an overload/short-circuit situation.
Regulated power supplies, such as the CSM in contrast, are equipped with an integrated
electronic short-circuit protection as required by the EN 60204-1 standard for the electronic
equipment for machines, that independently protects the CSM and the supplied 24 VDC
circuits against over-current in an overload/short-circuit situation. This consideration, for
example, applies to the direct power supply of the drive group from the 24 V busbar.
The corresponding load feeders must be selectively protected for the supply to external
components. Circuit-breakers (for example, order no.: 5S..., ETB1 catalog) or the SITOP
Select diagnostic module (order no.: 6EP1961-2BA00) can be used. The rated size of the
protective devices depends on the required current. The protection device also performs the
line protection and sometimes also the device protection of the attached consumers. In a
fault situation, the CSM must be able to supply the required current until tripping.
5-54
). This connection should
2
Guide for the SINUMERIK 840D sl machine configuring
Manual, 07/2006 Edition, 6FC5397-6CP10-0BA0