Dynalco SWT-2000 Speed Switch/Speed Transmitter User Manual
Page 32
Operating Instructions SWT-2000
DYNALCO
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7.3.5 Frequency X2 and X4
Prerequisites for the X2 and X4 function are that the input frequencies are synchronized, they exhibit
approximately 90 degrees phase shift and a Mark : Space ratio of approximately 1:1.
The X2 function is an EXOR combination of input frequencies S1 and S2. The X2 output frequency can reach
a max value of 35KHz.
The x4 function is based on doubling of the X2 frequency and generates a 10us output pulse each time a
positive or negative X2 edge is detected.
The Mark : Space ratio thereby changes with frequency. The x4 output frequency can reach a max value of
35KHz.
Frequency S1
Frequency S2
Frequency X2
Frequency X4
90°
10us
7.3.6 Relay and Open Collector Latch Function
Relays and Open Collectors can be assigned a latch function. If a signal arrives from the assigned function the
relay / OC is latched and remains latched until reset via binary input or the
Where fail safe mode is selected the deactivated Relay / Open Collector state is held.
7.3.7 Analog Output
If an analog time constant higher than zero is set, with measurement interval of 2ms, then the max.
frequency that can be measured is 35KHz.
To measure frequencies higher than 35KHz with time constant higher than zero, a min. measurement
interval of 5ms must be selected.
If Sensor Alarm is active that influences the analog output, which assumes the error condition:
Configuration Output
current
0 .. 20mA
21mA
4 .. 20mA
4mA