Table 8-1 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
8.1.2 Grounding concept
Components
The SINUMERIK 840D sl system consists of a number of individual components which 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 Pushbutton Panel (MPP)
• Keyboard
• Operator panels (operator panel front + TCU/PCU)
• Distributor box and handheld unit
• S7-300 I/O with IM 153 interface module
Grounding measures
The individual modules are attached to a metal cabinet panel. Insulating paints on the mounting
points (e.g. tension jacks) must be removed.
It is permissible to cluster the operator control components regarding connection/potential
bonding.
Example: The control panel on the swivel arm.
It is sucient in this instance to connect the ground connections of, for example, the PCU, TCU,
and operator panel front using a cable and to route a shared grounding conductor to the central
ground connection in the control cabinet.
Please note that interruption of the grounding during maintenance work is not permissible.
Additional references
EMC Design Guidelines
Technical data
8.1 Supplementary electrical conditions
ONE MCP Part 1: MCP xxxx
56 Equipment Manual, 07/2020, A5E50324729B AA
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