Installation
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.
Operation
On power- ode jumper can be set to the required operating mode. In
eport an alarm. The unit
-up or reset. After this time, the
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 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.
Learning Mode
by pressing the
reset switch.
LED Status
Green LED:
The green LED should be on contin
Yellow LED:
This will be on if the sensor reading is more than 33% of the threshold setting.
Orange LED:
This will be on if the sensor reading is more than 66% of the threshold setting.
Red LED:
This will be on solidly if the sensor reading exceeds the threshold setting. If the red LED is flashing, it is either becau
or, if the green LED is off, because the unit has disco
Error Indication
If the unit thinks that there is an error (for example, the sensor reads such an extreme level that a short circuit is suspected) then the red LED will
flash continuously, the relay will be de-energised, and the sounder will be activated (if enabled). The sounder pattern will be three tones followed
by a gap, to differentiate it from the flood warning. The green LED will be off to differentiate between an error report and
error report will be held until the reset button is pressed, although this function could reset automatically if the unit is
Sensitivity Adjustment
To adjust the sensitivity press the reset switch, the green LED will rapid flash
Potentiometer fully anticlockwise Most sensitive
Potentiometer fully clockwise Least sensitive
