Subject: From: Date:

RE: [ECS] Power Sentry & Secu 16 Doug Storey Wed, 17 Jan 2001 13:11:11 -0600

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Thanks you got me on the right track with the one shot.
However the way I solved it is with a modified oneshot where the power
sentry is the control voltage to a 555 timer. The output from this circuit
was tied to a reed relay (Power sentry will not operate a relay by itself)
which presents a dry contact closure to the SECU16 and that is what it
wants. I realize that with up to 5 million meter revs per year the mean time
failure for the reed relay is two years. I am placing the $1.29 relay in a
socket.



-----Original Message-----
From: joerut@epix.net [mailto:joerut@epix.net]
Sent: Tuesday, January 16, 2001 11:14 AM
To: ecs-list@netbloc.com
Subject: Re: [ECS] Power Sentry & Secu 16


Doug

Here is a copy of the data from the power sentry website. See below for
suggestions on your situation.


"Each Power Sentry sensor requires a small amount of power. The controlled
outputs of the ADC-1 can supply sufficient power to operate the Power
Sentry. It is necessary to install a three conductor cable (power, ground
and
signal) between the ADC-1 computer/sensor interface and the Power Sentry.
This cable can be as long as 200 feet.

The wires from the sensor have the following definitions:

Black - Ground (negative)

Yellow - Power (positive 5 -15 Volts DC) The Power Sentry must only be
operated on voltages between 5 and 15 volts DC. Voltages greater than these
levels will permanently damage the sensor.

Red - Power (positive 5 -15 Volts DC)

Green - Sensor Signal Out (this signal will be either at ground or at the
power supply voltage level, depending on whether the sensor is getting a
reflection off the disk edge).

Connect the red and yellow wires and the positive leg of your power source
together. In some cases it may be necessary to install a 500 µf
capacitor between power and ground to ensure that the sensor has sufficient
power
at the instant that it transmits its' pulse"



You must connect the yellow and red wires together and connect them to a
CLEAN  DC voltage (5-15 volts) The black is the ground wire and the green
would go to the input of the PLC. I am not familar with the secu16 but if
the
input is not LATCHED then it could possibly MISS the pulse because it is
so short. There are 2 ways around this either a oneshot circuit or a large
capacitor across the digital input. Let me know if you need more info.

Later
Joe Rut




> Rick,
> Power Sentry
> This sensor allows ECS to monitor your electrical power usage and
estimate
> your monthly bill. Inside every meter is a disk that rotates as
electricity
> is used. This sensor mounts on the outside of the meter glass and
transmits
> a pulse each time the disk completes a rotation (this represents 7.2
> watt/hours on most meters). This output can be monitored via a
> digital-input. It may also be connected directly to the INTERRUPT line
of an
> RS-232 cable, and monitored via a Serial-Byte Item.
> Product name(s): Power Sentry
> Distributor: Remote Measurement Systems (www.measure.com / 206-328-2255)
> This is a cut and paste from ecs.htm. Mark also Details connection for
the
> PLC-Interface-2C) But thus far I have been unable to make it work with
the
> secu-16.
>
> -----Original Message-----
> From: Rick Mortensen [mailto:rmorten@can-be-scanned.com]
> Sent: Monday, January 15, 2001 8:51 PM
> To: ecs-list@netbloc.com
> Subject: Re: [ECS] Power Sentry & Secu 16
>
> Doug,
> Could you be a little more specific regarding the Power Sentry?
> ----- Original Message -----
> From: Doug Storey <dastorey@swbell.net>
> To: <ecs-list@netbloc.com>
> Sent: Sunday, January 14, 2001 3:35 PM
> Subject: [ECS] Power Sentry & Secu 16
>
> > I Finally got back to cutting the last 1/2 dozen circuits out of my
time
> > commander + and transferred over to the Applied Digital Secu 16's. The
> time
> > commander will be for sell shortly. ( Shameless ad )  All is well
except
> for
> > making the Power Sentry work.  Has anyone had experience with this
combo.
> > If so please share the connection scheme for the 4 leads on the Power
> > Sentry.
> > Tks
> > Doug Storey
> >
>

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