WA1 Watch Instruction Sheet

WA1 Watch Instruction Sheet
BHM Electronics
WATCH ALARM
Contents
1 Watch Alarm display
1 mounting bracket
2 knobs for mounting bracket
2 keys
1 siren (with 5 metre lead)
Mounting
Dash Mounted - Use the mounting bracket as supplied.
Overhead Mounted - Loosen the four Philips-head screws in the extreme corners of the front panel until
the front panel can be lifted off the case. Rotate the front panel 180 degrees so that the bracket is at the
top. Screw the front panel back on.
Wall Mounted - Remove the bracket, loosen the four Philips-head screws in the extreme corners of the
front panel until the front panel can be lifted off the case. Underneath the front panel are four mounting
holes in the corners of the case. Mount the case using these holes then screw the front panel back on.
Siren - The siren should be mounted where it can be heard by other people if the watch keeper fails to
clear the alarm. Caution: Do not position it too close to a person, for example don’t aim it at the head of a
bunk. The siren is very loud and if positioned too close could damage a person’s hearing when it sounds.
Connections
Power - Connect the lead to a DC power supply of between 10 and 30 volts. Red wire to positive, black
to negative.
Siren - The orange wire is the siren positive output, connect it to the red wire on the siren cable. The
brown wire is the siren negative output, connect it to the black wire on the siren cable.
Autopilot Option - If the Watch Alarm is fitted with the autopilot interface option, connect the green and
yellow wires to the clutch output from the autopilot. The clutch output from the autopilot is used to switch
on the Watch Alarm, so the output must be on whenever the autopilot is engaged. This is used to operate
a relay inside the Watch Alarm. The relay will operate from 12 or 24 volts. Polarity does not matter, either
wire can be connected to positive.
Operation
Key switch in off position, autopilot off (if connected): operates as a clock.
Key switch in on position, or autopilot on (if connected): watch alarm is active. After the pre-set alarm
interval has passed the alarm sequence will start. Each stage lasts 30 seconds.
stage 1 red light on Clear Alarm button flashes
stage 2 internal alarm sounds
stage 3 internal alarm sounds louder
stage 4 external siren sounds
Pressing the Clear Alarm button at any time will reset the alarm countdown. It will also display the alarm
interval that the Watch Alarm is set to.
Setting the Clock
Make sure the key switch is in the off position, and the autopilot is off (if connected). The clock uses 24
hour time.
setting minutes
hold hours/minutes toggle switch down, press Clear Alarm button, each press
will advance the time by one minute.
setting hours
hold hours/minutes toggle switch up, press Clear Alarm button, each press
will advance the time by one hour.
Setting the Watch Alarm
Make sure the key switch is in the off position and that the autopilot is off (if connected). Then turn the key
to the on position or engage the autopilot (if connected). The display will change to show the alarm
interval. The alarm interval can be set for any time from 1 to 60 minutes. The Watch Alarm will beep until
the alarm interval has been set.
setting minutes
hold hours/minutes toggle switch down, press Clear Alarm button, each press
will advance the watch time by one minute.
setting tens of
minutes
hold hours/minutes toggle switch up, press Clear Alarm button, each press
will advance the watch time by 10 minutes.
The Watch Alarm will stop beeping once you start to set the alarm interval. If the alarm interval is already
correct just press the Clear Alarm button. If it has not been set after one minute the Watch Alarm will
default to a five minute alarm interval.
When no further change has been made for five seconds the alarm will be locked on and the display will
return to showing the time of day. To change the alarm interval again the key switch and the autopilot (if
connected) must be turned off, then on again.
If the key is removed in the on position the watch alarm can not be disabled, whether or not the autopilot
is engaged.
Power Usage
When in the clock mode the Watch Alarm uses very little power and can be left permanently running
without fear of draining the ship’s battery.
If the power is removed from the Watch Alarm the display will turn off but a super capacitor inside will
keep the correct time for several days.
Security Features
To prevent the power or external siren from being disconnected by an unauthorised person the cable
connectors can be concealed behind a secured panel.
If the power is removed with the Watch Alarm in the on mode the alarms will sound for five seconds after
power is returned. This is to warn of possible tampering. The Watch Alarm will then enter watch alarm
mode with no chance to change the alarm interval.
POWER SUPPLY
10V to 30V DC
<1mA in clock mode
30mA in alarm mode
200mA maximum with siren on
SIREN OUTPUT
8V DC 250mA maximum
INTERNAL FUSE
250mA M-205
BHM Electronics
287 Dee Street, Invercargill, New Zealand
Postal: PO Box 787, Invercargill
Phone or Fax +64 3 218 3495
B130203
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