
Patol Limited
2.7.3 Normal
LED
An LED indicating normal operation may be connected at terminals 23/24.
The LED is illuminated under normal conditions. When terminals 25/26 are open
the LED extinguishing on either electrical supply fault or air pressure failure.
When terminals 25/26 are linked the LED extinguishes on electrical supply fault
only.
The output is constant current regulated at 1.5mA. A low current LED may be
connected in both relay and low power modes. In the latter case the 1.5mA LED
current should be taken into account when determining the value of the EOL
resistor appropriate to any control panel monitoring circuit employed.
2.7.4 Pressure
Switch
The compressed air supply may be monitored by connection of a pressure switch
at terminals 27/28. The switch must be normally closed - opening on air supply
failure.
If no switch is employed terminals 27/28 should be linked.
2.7.5
Auxiliary / Local Reset Push-button
A normally open Reset push-button may be connected at terminals 20/22. (The
signal at terminal 22 is switch low / 0V)
2.7.6 Alert
Output
A signal at terminal 21 is in effect an open collector switch low (0V) on either
channel detection. This output occurs even if the unit is set for coincident alarm
operation and may be considered as an Alert which will operate for the duration of
the scan period, with auto-reset if coincident condition does not occur. Also refer
to 2.6.2 & 2.6.4.
In relay mode the output may be used for example for connection of a 24V
indicator between terminals 19/21.
In low power mode it is likely that the maximum permissible non-alarm current
parameter of the control equipment monitoring (trigger) circuit will preclude the
use of this output.
2.7.7
Local Alarm indicator
When in relay mode one of the sets of alarm contacts may be employed to switch
a local Alarm LED or Lamp.
In low power mode the indicator should be integrated with the alarm resistor
connection at terminals 2/7. The voltage and current of the device must be
appropriate to the alarm current parameter and load characteristic of the control
equipment monitoring (trigger) circuit.
Page 10 of 16
D1198 - Issue 1 - 25 September 2013
Series 5000 - Manual 5610