Voith BTS - Page 77

KFA6-SOT2-Ex2
1
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Switch Amplifier
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(MZ
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
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Connection
Assembly
 2-channel isolated barrier
 230 V AC supply
 Dry contact or NAMUR inputs
 Passive transistor output, non-polarized
 Line fault detection (LFD)
 Reversible mode of operation
 Up to SIL 2 acc. to IEC 61508
Function
This isolated barrier is used for intrinsic safety applications. It
transfers digital signals (NAMUR sensors/mechanical
contacts) from a hazardous area to a safe area.
Each proximity sensor or switch controls a passive transistor
output for the safe area load. The normal output state can be
reversed using switch S1 for channel I and switch S2 for
channel II. Switch S3 enables or disables line fault detection of
the field circuit.
During an error condition, the transistors revert to their de-
energized state and LEDs indicate the fault according to
NAMUR NE44.
Features
13
46
2
5
13 15
12
9
10
7
14
11
8
KFA6-SOT2-Ex2
1
2
OUT CHK PWR
S2
S1
S3
III
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8VERWMWXSVSYXTYXII
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