The Inor SR560 dual-channel alarm unit is built to monitor mA or V signals in the process industry. The two channels are fully independent. The SR560 is specially designed for reliable safety triggering without false alarms. High configuration flexibility allows for adaptation to required alarm functions.
The SR560 is equipped with two galvanically isolated monitoring channels. Each channel has an output relay with switch over contact. The functions of the channels can be set independent of each other.
Configuration changes are made conveniently with jumpers. The following adjustments are available for each channel: input type (mA or V), measuring range (see specifications), High/Low alarm, the relays normally active or passive functions, alarm delay 0.4 or 2 s. The hysteresis of the trip function is adjusted with a 15-turn potentiometer in the front. The hysteresis can be set between 0.35 and 80 % of input span.
A voltage outlet and a 15-turn potentiometer on the front panel are used to adjust the set-points for each channel. The set-point can be measured as a voltage from the test outlet. The scale is 0(2)-10 V for 0-100 % of input signal.
The relays normally active or passive functions are chosen to suit the use of the monitor. Normally active, with the relay coil activated and the monitor inactive (no alarm), is suitable when the monitor is used to give an alarm signal at error states . This means that in case of a power supply failure the monitor will give an alarm signal (=monitoring out of order). Normally passive is mostly used to provide a trip function to switch off equipment, thus saving costly and unnecessary operational stops.
The choice of High or Low alarm functions depends on whether increasing or decreasing signal is to be monitored. Alarms are always indicated by a lighted red LED independent of configuration. The choice of open or closed relay contacts is made when connecting the output signal lines.
Comparison of monitored input signals to the adjusted set-point is carried out in two stages using a special principle, which gives a very efficient filtering of transient interference and noise. Reliability in the monitoring system is increased with a dynamic hysteresis, which connects the preset hysteresis when an alarm is monitored. The relays in the SR560 will not give a false alarm when power is switched on. A 15-turn potentiometer insures high definition and stability in adjusted set-point.
All connections are made with plug-in screw terminals. Installation is simplified by connection diagrams on the front panel. Compact mounting on DIN-rail The SR560 snaps on to a 35 mm DIN-rail and can be mounted with high density.
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