Siemens NCZ Specifications download pdf (Page 24)

2.1 Supplementary electrical conditions

2-24

SINUMERIK 810D Equipment Manual Configuration CCU (PHC) – 03/2006 Edition

2.1.1 Power supply

Warning

 The DC power supply is always referenced to ground and must be

generated by a safety transformer.

 Final user interfaces are powered via a DC power supply with protective

separation per EN 61800-5-1.

 In the case of supply cables > 10 m, protective elements must be fitted at

the device input in order to protect against lightning (surge voltage).

 The DC power supply must be connected to the ground/shield of the NC for

EMC and/or functional reasons. For EMC reasons, this connection should

only be made at one point. As a rule, the connection is provided as

standard in the S7-300 I/Os. If this is not the case in exceptional circum-

stances, the ground connection should be made to the grounding rail of the

NC cabinet; also refer to /EMC/ EMC Configuring Guidelines.

Table 2-1 Requirements of the DC supply

Rated voltage In accordance with EN 61131-2

 Voltage range (average value)

 Voltage ripple peak-to-peak

 Ramp-up time at power-on

24 V DC

20.4 V DC to 28.8 V DC

5 % (unfiltered 6-pulse rectification)

Any

Non-cyclic overvoltages

 Duration

 Restoration time

 Events per hour

 35 V

 500 ms

 50 s

 10

Transient voltage interruptions

 Outage time

 Restoration time

 Events per hour

 3 ms

 10 s

 10

The EP and CP points for the power modules only apply in conjunction with the

SINUMERIK 810D (axis expansion). The EP and CP points from Catalog NC 60

apply when SIMODRIVE 611D modules with control plug-in units are used.

Demands on DC

power supplies

Configuration

810D power

consumption

Connection Conditions

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Siemens NCZ Specifications Page 24

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