BEKA BA314NG, Manual

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4.2.3 Open collector input
Sensors with an open collector output located in
Zone 2 or in the safe area may be directly connected
to input terminals 5 & 6 providing the sensor and
associated wiring can withstand a 500V rms insulation
test to earth.
The BA314NG contains a configurable debounce
circuit to prevent false triggering. See section 6.6.
4.2.4 2-wire proximity detector input
Most Zone 2 certified NAMUR 2-wire proximity
detectors, except intrinsically saf devices, may be
directly connected to a BA314NG input terminals 5 &
6 providing minimum operating voltage is greater than
7.5V. The proximitor and the associated wiring should
be able to withstand a 500V rms insulation test to
earth.
The BA314NG contains a configurable debounce
circuit to prevent false triggering. See section 6.6.
4.2.5 Magnetic pick-off input
Sensors incorporating a magnetic pick-off will usually
have a low level ac voltage output which a BA314NG
Tachometer can sense when configured for a
CoiL
input. The Tachometer input terminals 5 and 6 may
be connected to any Zone 2 certified magnetic pick-off
output sensors, except intrinsically safe devices,
providing the output in normal operation is equal to or
less than 30V the Tachometer's Ui. The sensor and
associated wiring should be able to withstand a 500V
rms insulation test to earth.
The BA314NG contains a configurable debounce
circuit to prevent false triggering. See section 6.6.
4.2.6 Voltage pulse input
Two voltage pulse input ranges are selectable in the
BA314NG Tachometer configuration menu,
VoLt5 L
and
VoLt5 H
. The Tachometer input terminals 5 and 6
may be connected to any Zone 2 certified voltage
pulse output, except intrinsically safe source,
providing the output in normal operation is equal to or
less than 30V, the Tachometer's Ui. The sensor and
associated wiring should be able to withstand a 500V
rms insulation test to earth.
The BA314NG contains a configurable debounce
circuit to prevent false triggering. See section 6.6.
4.3 Remote reset
The BA314NG Tachometer's run-time display may
be remotely reset to zero by connecting terminals
RS1 and RS2 together. Permanent interconnection
inhibits the run-time clock. Remote resetting may be
accomplished by any mechanically operated switch
located in Zone 2. The Tachometer’s reset circuit is
non incendive, therefore the switch contacts do not
need additional protection in Zone 2, although the
switch and the associated wiring should be able to
withstand a 500V rms insulation test to earth.
The BA314NG run-time display may also be reset
when the
&
and
*
push buttons are operated
simultaneously in the totalising mode i.e. when the
instrument is displaying speed. See 6.15
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