Jetter JM-204-480, Руководство пользователя

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JetMove 204-480 13 Safe Standstill (Option)
Jetter AG 99
13.5.1 Control variants for "Safe Standstill"
• Controlling via safety relays
• OSSD control
OSSD: O utput S ignal S witching D evice
Controlling the inputs "Safe Standstill" with test pulses for recognizing short
circuits, shorts between contacts, or shunts of the control cable. The test pulses
have a length of 1 ms and a repetition frequency of 100 Hz. At applying a control
logic with OSSD signals, errors (e.g. short circuits or shorts between contacts)
can be recognized by the logic circuit itself, and they will lead to switching off both
signal ways.
The following signal waveforms are accepted by the OSSD signals without triggering
an error message:
Fig.: 24: Example: OSSD-signal waveform, single pulse
Fig.: 25: Example: OSSD-signal waveform, dual pulse
24 V
0 V
<1.3 ms >7.0 ms
24 V
0 V
<0.8 ms
>7.0 ms
<0.8 ms 0.5 ms