Dynalco SWT-1000 Speed Switch/Transmitter - Manual (Page 21)

Operating Instructions SWT-1000 DYNALCO
SWT-1000.r2.0609 19
8.3.5 Binary Input
2 functions are executable using the binary input:
• Switching between parameter sets A and B. See 8.3.2 Parameter Sets A and B.
• Resetting a latched relay. See 8.3.3 Rela.
The binary input has an internal pull up resistor to +5V and is therefore normally logic High.
Shorting the binary input to the sensor supply 0V creates a logic 0.
Switching the input for between 0.1 and 0.3 seonds resets a
latched relay but does not influence parameter set selection, which
requires longer than 0.3 seconds.
8.4 Fault Behavior
8.4.1 Sensor Fault (Sensor monitoring)
The sensor may be monitored in 2 ways. With sensors powered by the SWT-1000 the sensor
supply current is monitored. If the current falls outside the permitted range then sensor fault is
indicated.
If the sensor is not powered by the SWT-1000 then it may only be monitored for disconnection. If
disconnected, sensor fault is indicated.
The SWT-1000 behavior in the event of a sensor fault is dependent on the configuration:
Outputs in the event of a sensor fault
Analog output
Alarm Configuration
LED
Current
Relay
Only System error On Measured value output per configuration
System error OR Sensor monitoring Off 0mA Deactivated
8.4.2 System Alarm
If the microprocessor detects a checksum fault (RAM, ROM or EEPROM) the measured value is
set to 0 RPM, The analog output goes to 0/4mA and the relay is deactivated.
Outputs in the event of a System alarm
Analog output
Alarm Configuration
LED
Current
Relay
Only System error
System error OR Sensor monitoring
Off 0mA Deactivated
8.4.3 Alarm
As long as a combined alarm is present, no measurements are conducted and the outputs behave
as described above. Once the fault or alarm condition is removed the last correct measured value
is assumed. Eventual limit activation is not taken into account.
5 Volt SWT-1000
parameter set A B
analysis
+Bin
OVS
pushbutton
10k