Looking for a timer that is programable in increments of seconds rather than minutes

[Pinkfish]

As the title suggsts im looking for a timer that I can connect to a powerhead that has increments of seconds.

I found this http://www.maplin.co.uk/module.aspx?...224&doy=search

But my knowledge of making timers and electronics is non existant.

Any ideas guys ?

Mike

[lr85ninety]

look in rs

[Pinkfish]

whats rs ???

[Guest]

rs components you can check online to see stock just search for timers john

[lr85ninety]

yeah sorry pinkfish pm me if you want a link

[cl0wn]

this maybe completely useless info, but if it's for making a wavemaker, make sure you have the correct powerheads. i had aquaclears on a system 2000 wavemaker, every time they started up they used to rattle like hell and kick a load of bubbles out, they were really annoying. IIRC maxijets have a soft start, which minimizes this. as i said could be useless info but what the hey.

[Pinkfish]

Yep thats exactly what I am wanting to do .... build a wavemaker .... of course I will post pics.

I will be using a maxijet 1200 modified.

Just need to find a suitable switch anyone know which of these is ok

453

On Pulse (ConstantSupply) Type 3

A permanent supply is required. Control switch ’S’ controls the timers function. When ’S’ is
closed and remains closed the output relay ’R’ will energise and only de-energise after it has
timed out. If ’S’ is opened during the timing period relay ’R’ resets.

454

On Pulse (Constant
Supply) Type 4
A permanent supply is required. Control switch ’S’ controls the timers function. When ’S’ is
opened and remains open the output relay ’R’ will energise and only de-energise after it has
timed out. If ’S’ is closed during the timing period relay ’R’ resets.

511

Off Pulse

A permanent supply is required. Control switch ’S’ controls the timers function. Closing
control ’S’ has no effect on output relay ’R’. However when ’S’ is opened ’R’ will energise
and starts the time period, after which it will de-energise. If switch ’S’ is pulsed during that
timing period it will have no effect on relay ’R’. Closing and then re-opening ’S’ will repeat
the timing operation after the completion of the timing period.

521

On Off Pulse A permanent supply is required. Control switch ’S’ controls the timers function. The
output relay ’R’ is energised by either opening or closing control switch ’S’. Once a timing
period has started it cannot be interrupted by changing the state of ’S’.

611

Symmetrical Recycler Pulse Start

When the supply is connected to the timer it will energise the output relay ’R’ for the preset
time and then de-energise for the same preset time interval. This operation will repeat
indefinitely until the supply is removed. The timer will always start at the same point of the
cycle regardless of where it was when the supply was removed. The unit can be either
pause or pulse start depending on wiring or type.

612

Symmetrical Recycler Pause Start

When the supply is connected to the timer the preset time will elapse before output relay "R"
energises for the same preset time interval. This operation will repeat indefinitely until the
supply is removed. The timer will always start at the same point of the cycle regardless of
where it was when the supply was removed. The unit can be either pause or pulse start
depending on wiring or type.

651

Asymmetrical RecyclerPause Start

When the supply is connected to the timer the first preset time will elapse before the output
relay ’R’ will energise. The output will stay energised for the second preset time period
(which is set independently to the de-energised time) it will return to the de-energised state
and repeat the whole process over again. This is continued until the supply is removed. The
timer will always start in the de-energised part of the cycle regardless of which state it was
in when the supply was removed.

652

Asymmetrical Recycler Pulse Start

When the supply is connected to the timer the output relay will energise for the first preset
time. Once this has elapsed the output will de-energise and stay de-energised for the second
preset time period (which is set independently to the energised time). Once this has elasped
then it will return to the energised state and repeat the whole process over again, until the
supply is removed. The timer will always start in the energised part of the cycle regardless
of which state it was in when the supply was removed.

661

Asymmetrical Recycler(Constant Supply) Pause Start

A permanent supply is required. The timer function is triggered by the use of a control
switch ’S’. When ’S’ is closed the output relay ’R’ will remain de-energised while the first
preset time period elapses. Once this time period has elapsed ’R’ will energise for the
second preset time period (which is set independently). Once this second time period had
elapsed then ’R’ will de-energise and the cycle will start from the beginning again.If ’S’ is
opened the cycle will stop, with it starting in the de-energised state when the switch is
closed again.

662

Asymmetrical Recycler(Constant Supply) PulseStart

A permanent supply is required. The timer function is triggered by the use of a control
switch ’S’. When ’S’ is closed the output relay ’R’ will energise while the first preset time
period elapses. Once this time period has elapsed ’R’ will de-energise for the second preset
time period (which is set independently). Once this second time period had elapsed then ’R’
will energise and the cycle will start from the beginning again. If ’S’ is opened the cycle will

stop, with it starting in the energised state when the switch is closed again.

How do I connect these timmers as they all look like:

Its not a yellow, brown and blue job is it ?

Mike

[MR Teee]

611
Symmetrical Recycler Pulse Start

When the supply is connected to the timer it will energise the output relay ’R’ for the preset
time and then de-energise for the same preset time interval. This operation will repeat
indefinitely until the supply is removed. The timer will always start at the same point of the
cycle regardless of where it was when the supply was removed. The unit can be either
pause or pulse start depending on wiring or type

This one looks good to me mate. Wiring instructions will be included, but post up on here if you get stuck.

[johnl69]

This may not be of any use to you but I did some research a while back ahen I was designing a wavemaker for use with seio pumps instead of turning them on and off the circuit modified the Hz so the pumps would slow down rather then turn off.

john

[richardb22]

be careful the relay can handle the highly inductive load of the pump or it'll fail quickly with such rapid switching. I don't know what power your pump is rated at but multiply it by about 5 and if the relay meets that you should be ok