BEKA BA314NG, Manual

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3.6 Pulse input
The BA314NG Tachometer has a single pair of pulse
input terminals 5 and 6 that may be configured for use
with different types of sensor.
For sensors that require energising to determine their
state, such as switch contacts or a 2-wire proximity
detector, an external link between terminals 3 & 4 of
the BA314NG connects an internal 7V, 6mA supply to
the input terminals.
Energising is not required when the Tachometer input
is connected to a voltage pulse source.
Fitting an external link between terminals 3 & 4
changes the Tachometer's pulse input safety
parameters in normal operation as shown below. This
table also shows the types of sensor requiring
energising (link fitting).
Safety parameters
Input Output
Type of input Link 3 & 4 Ui Uo Io
Switch contact Yes 15V 10.5V 9.2mA
Proximity detector Yes 15V 10.5V 9.2mA
Open collector Yes 15V 10.5V 9.2mA
Magnetic pick-off No 30V 1.1V 0.5mA
Voltage input (low) No 30V 1.1V 0.5mA
Voltage input (high) No 30V 1.1V 0.5mA
3.7 Remote reset terminals
The BA314NG run-time display may be reset to zero
by connecting the external reset terminals RS1 and
RS2 together for more than one second. The two
reset terminals have the following safety parameters
in normal operation:
Ui = 30V
Uo = 3.8V
Io = 1mA
3.8 Certification label information
The Tachometer certification information label is fitted
in a recess on the top outer surface of the instrument
enclosure. It shows the ATEX and IECEx certification
information plus BEKA associates name, location,
year of manufacture and the instrument serial number.
BA314NG Certification information label
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