Siemens SIMATIC TI500 Specifikace stáhnout pdf (Strana 49)

100

101

2-14

Pre-installation Guidelines SIMATIC 545/555/575 System Manual

Correcting Noise Problems (continued)

You can also use contact snubbing (shown in Figure 2-9) as an alternative

type of snubbing.

Both types of snubbing cause the physical devices to come on or go off more

slowly. The resistance-capacitance (RC) and metal oxide varistor (MOV)

elements should have minimal effect on system timing; their time constants

are substantially less than one millisecond.

Discrete

Output Load

Discrete Output

Module Protection

RC snubbing

Discrete

Output Load

Discrete Output

Module Protection

MOV snubbing

MOV

Input Power Input Power

Figure 2-9 Contact Noise Snubbing

NOTE: The noise snubbing shown in Figure 2-9 is built into the

PPX:505–5518 relay output module.

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