Siemens SINUMERIK 840DE SL - Grounding Concept

Table 4-1 Requirements of the DC power supply
Rated voltage According to EN 61131-2
Voltage range (mean value)
Voltage ripple, peak/peak
Ramp-up time when switched on
24 VDC
20.4 VDC to 28.8 VDC
5% (unsmoothed 6-pulse recti󹪝‐
cation)
any
Non-periodic overvoltages
Period of overvoltage
Recover time
Events per hour
≤ 35 V
≤ 500 ms
≥ 50 s
≤ 10
Transient voltage interruptions Downtime
Recovery time
Events per hour
≤ 3 ms
≥ 10 s
≤ 10
4.1.1.2 Grounding concept
Components
The SINUMERIK ONE system consists of several individual components that have been designed
so that the system complies with the appropriate EMC and safety standards. The individual
system components are:
• Numerical Control Unit NCU
• Machine Control Panel MCP, Machine Push Button Panel MPP
• Keyboard
• Operator panels (SIMATIC ITC, SIMATIC IPC for SINUMERIK + SIMATIC IFP)
• Distributor box and handheld unit
• S7-1500 I/O devices
Grounding measures
The individual modules are attached to a metal cabinet panel. Insulating paints on the mounting
points must be removed.
It is permissible to have a cluster of operator components for ground connection /
equipotential bonding.
Example: The control panel on the swivel arm.
It is su󹪟cient in this instance to connect the ground connections of, for example, the
SIMATIC IPC for SINUMERIK or ITC using a cable and to route a shared grounding conductor to
the central ground connection in the control cabinet.
More information
More information about EMC installation guidelines can be found under:
• Con󹪝guration Instructions, EMC installation guideline
General information and networking
4.1Application planning
Handheld Terminal HT 8
24 Equipment Manual, 02/2024, A5E52918633B AA