Eaton Crouse-Hinds Series Instruction Manual page 47

INM 4500/4600 Rev 12
DRAFT - 22 March 2018
Switch input operation
If switch contacts are used for this Pulse Input (terminals 1 & 2), then series and parallel
resistors must be fitted - see Section 6.1.2 for recommended values.
Simple or Legacy mode - SW4 - OFF
If simple "pulse-in/pulse-out" operation is required or, if a replacement for the earlier
MTL4032 pulse isolator is required, then SW4 should be set to OFF . The input switching
point voltage (Vsp) thresholds can then be defined by Switches 1 & 2, and the LFD
operation can be set with Switch 3. When Switch 3 is ON, the Alarm output (terminals 11
& 12) become active.
Configurable mode - SW4 - ON
In this mode, analogue, alarm and pulse outputs are available but the module must be
software configured to define its operating mode. In this mode, software controls the LFD
function and Switch 3 has no effect. Switches 1 & 2 continue to define the switching point
threshold (Vsp). Configuration requires a personal computer, a PCL45USB interface and
PCS45 software. See Section 6.9 on page 58 for details of the configurator.
Alarm inhibiting
The Inhibit input is provided to inhibit alarm output operation. This facility is useful, for
example, during power-up, when pulse rates are below the alarm threshold. When normal
operational values are established the inhibit can be disabled. Such a facility is sometimes
referred to as a start-up delay. Inhibit is enabled by connecting a switch or proximity
detector between terminals 6 and 3. If switch contacts are used for this input, then series
and parallel resistors must be fitted - see Section 6.1.2 for recommended values.
LED indicators
Use the following LED information to understand the module status.
LED Description
PWR
ON - Power OK
Power (green)
O/P The LED will follow the pulse output state. If the output is pulsing
Output then the LED brightness will pulse. If the pulsing is rapid or very
(yellow) short, the LED may dim if it is unable to respond to such changes.
If the output is high, the LED will be ON.
STS In legacy mode a line fault will cause the LED to turn ON.
Status In µC mode, the LED is programmable to display a line fault or an
(red - flashing) Alarm trip operation. In the event, it will also indicate a µC fault
condition.
OFF - No power or insufficient voltage
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