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WD-AMX
Date of Issue: 17/08/2012
Issue Number: 5.4
Antistatic precautions must be observed when handling these sensors. The PCB contains circuitry that can be
damaged by static discharge.
1.
The WD-AMX should only be installed by a competent, suitably trained technician, experienced in installation with
hazardous voltages. (>50Vac & <1000Vac or >75Vdc & 1500Vdc)
2.
Ensure that all power is disconnected before carrying out any work on the WD-AMX.
3.
Maximum cable is 2.5mm², care must be taken not to over tighten terminals.
4.
When mounting the WD-AMX care should be taken not to stress the PCB when fitting to the DIN rail. If it is
necessary to remove the module from the DIN rail, be sure to use a flat bladed screwdriver to release the DIN clips.
5.
The WD-AMX-1 is designed to operate from a 24Vac or 24Vdc supply (so that power can be drawn from a 24Vac
transformer used for other purposes if a 24Vdc supply is not available). The WD-AMX-2 is designed to operate from
a
230Vac
mains
supply.
6.
The relay output is an SPDT type, allowing either a Normally Open (NO) or Normally Closed (NC) connection.
On power-up or by pressing the reset button, the unit enters “learning” mode, the mode jumper can be set to the
required operating mode. In “learning” mode, the sensor sensitivity trimmer can be adjusted, and the level used as the
threshold at which the unit will report an alarm. The unit will only be in “learning” mode for approximately 20 seconds after
power-up or reset. After this time, the unit will enter “run” mode, so that any adjustment of the trimmer or change to the
relay mode jumper has no effect. Note that if the reset button is pressed, the alarm will sound (if enabled) for at least two
seconds as part of the initialisation function. In this event, the mode jumper and trimmer setting should be checked before
the unit is left to monitor the sensor autonomously.
When the unit is first powered up, the sounder will be activated (if enabled) and the LED’s demonstrated. The relay will be
left de-energised for a minimum of two seconds. This is so that there will be an alert reported over the relay if the reset
button is pressed.
Once the relay has been energised, it will be held in this state for a minimum of two seconds, even if a flood is detected
immediately.
Changes in alarm threshold and relay output mode can only be made while the unit is in “learning” mode. Enter “learning”
mode by pressing the reset switch.
Installation:
Operation:
Learning Mode:
