Installation Instructions User guide

Bul. 937C Universal Frequency Converter Installation Instructions
Serial Switching
To select this function, in the serial switching menu option, press the OK key twice. You can cancel after the
first OK with ESC.
When serial switching is selected, input pulses are switched 1:1 to the switch output. Pulses can then be
evaluated in the process control system/in the control unit. So in this function, the Bul. 937 device is only an
isolator between intrinsically safe and non-intrinsically safe circuits.
The maximum switching frequency at the transistor output is 5 kHz; at the relay < 2 Hz. The relays are thus
only suitable as serial switching outputs in exceptional cases.
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