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Siemens SINUMERIK 840D sl Manual de equipamiento

Technical specifications

7.2 Secondary electrical conditions

7.2

Secondary electrical conditions

7.2.1

Power supply

Requirements for DC power supplies

Electric shock due to connection of an unsuitable power supply

When equipment is connected to an unsuitable power supply and/or insufficiently grounded or

rear cover, exposed components may carry a hazardous voltage that might result in serious

injury or death.

• Only use power supplies that provide SELV (Safety Extra Low Voltage) or PELV (Protective

Inadequately fused supply cables can be life-threatening

In the case of supply lines >30 m, protectors must be installed at the device input to protect

against lightning (surge).

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. In exceptional circumstances

when this is not the case, the ground connection should be made on the grounding rail of the

NC cabinet (also refer to /EMC/EMC Installation Guide.)

Table 7-1

Rated voltage

Non-periodic overvoltages

Transient voltage interruptions

WARNING

Extra Low Voltage) output voltages acc. to UL 61010 for all connections and terminals of the

electronics modules.

WARNING

Requirements of the DC power supply

According to EN 61131-2

Voltage range (mean value)

Voltage ripple, peak/peak

Ramp-up time when switched on

Period of overvoltage

Recover time

Events per hour

Downtime

Recovery time

Events per hour

Equipment Manual, 12/2022, A5E50751046B AA

24 VDC

20.4 VDC to 28.8 VDC

5% (unsmoothed 6-pulse rectifi‐

cation)

any

≤ 35 V

≤ 500 ms

≥ 50 s

≤ 10

≤ 3 ms

≥ 10 s

≤ 10

Operator panel front: OP 010S