Alpha RY502A User Manual

RY502A DUAL DOOR

TIMED SWITCHER RELAY

APPLICATION

The RY502A Dual Door Timed Switcher Relay is used
primarily to switch the door release functions automati­cally from an exterior entry door to an interior lobby door,
when triggered from an intercom or video-intercom
system. It's versatility allows its use in other specialty
door and auto-switching relay applications.

PROCEDURE

1. Read installation instructions for this unit to determine
proper location and installation method.

2. Install equipment.

3. Check wiring and connect. Observe all local and
national electrical and building codes.

4. Apply power and check unit operation.

INSTALLATION AND

EQUIPMENT LOCATION

The RY502A relay should typically be installed relatively
close to an accessible source of 117-120VAC power,
preferably close to the intercom or video-intercom sys­tem amplifier/control unit. Four (4) convenient mounting
holes allow the unit to be mounted to a board or wall
surface (using stand-offs or spacers). Make sure to
mount the RY502A in a dry and ventilated environment,
and keep away from any source of potential electrical
interference. Observe all local and national electrical and
building codes!

RY502A Dual Door

Timed Switcher Relay

Installation and Use Instructions

WIRING

Route all cables away from AC power wiring, transform­ers, fluorescent lights, light dimmers or other electrical
devices. Protect cable from damage. Shielded cable should
be used if AC interference is a concern, or if cables cannot
be run adequately spaced away from any source of
electrical interference.

CONNECTIONS
Before connecting, make certain wires are free from
shorts or grounds. Make connections as shown on Page

4, and as detailed in the following instructions.

RY502A DUAL DOOR TIMED SWITCHER RELAY

1. Connect a separate 16VAC transformer (to power
the RY502A board), and connect to the two (2)
RY502A terminals marked 16VAC POWER.
This 16VAC power should be used only to power the
RY502A and should not be used to power any other
equipment. NOTE: DO NOT APPLY THIS

16VAC POWER UNTIL ALL WIRING HAS
BEEN CHECKED AND ALL OTHER CON­NECTIONS HAVE BEEN MADE.

2. Run two (2) wires from the 8VAC to 24VAC door
release OUTPUT of your existing intercom or video­intercom system, and connect to the two (2) RY502A
terminals marked DO INPUT 8-24VAC. We have
designed this flexibility into the RY502A to allow it to
be used with almost any intercom or video-intercom
door release output power.

3. A factory installed jumper wire should be connect to
the two (2) RY502A terminals marked JUMPER
DOOR CONTACTS. We have designed this flex­ibility into the RY502A to allow it to be used as a "man
trap", which would require that the Outside Door be
closed (as evidenced by a short across these termi­nals) before the interior door release will activate. If
you wish to utilize this feature, remove the factory
installed jumper wire and run two (2) wires to a door
contact switch, connected to the Outside Door,
which would be 'open' when the door is 'open.
Otherwise, leave the jumper in place.

4. Run two (2) wires from the Outside Door release
device to the RY502A. If you wish to send 16VAC
to that door strike, connect to the two (2) RY502A
terminals marked DO#1. If you wish to use a
different voltage to power this door strike or if you
are using a magnetic lock, you would want to connect

Copyright© 2006, Alpha Communications®, All Rights Reserved.

AWD112 Rev. 1 (02/

these two (2) wires to the Form-C relay used for the
Outside Door. Connect one wire to the Common terminal
(COMM) and the other wire to the Normally Open
(NO)

OR Normally Closed (NC) terminal for OUT-

SIDE No. 1. When a door strike is used with a voltage
requirement other than 16VAC, you will need to provide
a separate low-voltage transformer with the proper
voltage to power the Outside door strike. We have
designed the RY502A to allow it to be used with almost
any type of door release or magnetic lock on the market.

5. Run two (2) wires from the Inside Door release device to
the RY502A. If you wish to send 16VAC to that door
strike, connect to the two (2) RY502A terminals marked
DO#2. If you wish to use a different voltage to power this
door strike or if you are using a magnetic lock, you would
want to connect these two (2) wires to the Form-C relay
used for the Inside Door. Connect one wire to the
Common terminal (COMM) and the other wire to the
Normally Open (NO) OR Normally Closed (NC) termi­nal for INSIDE No. 2. When a door strike is used with
a voltage requirement other than 16VAC, you will need
to provide a separate low-voltage transformer with the
proper voltage to power the Inside door strike. We have
designed the RY502A to allow it to be used with almost
any type of door release or magnetic lock on the market.

16VAC TRANSFORMER

1. Do not connect the 16VAC transformer primary to 117­120 VAC until entire installation is complete and all wiring
is checked.

FINISH INSTALLATION

1. Install RY502A relay. Do not overtighten screws.

2. Make sure the RY502A is not twisted or buckled.

3. Connect transformer primary to 117-120 VAC. Observe
all local and national electrical and building codes.

TEST AND CHECKOUT

1. Apply 16VAC power to the RY502A relay unit. The
Green LED should show a Power 'On' condition.

2. Check for proper relay switching operation in accor­dance with the operating instructions.

NOTE: System warranty is void if this unit is installed or
used in any manner other than described in this manual.

OPERATING INSTRUCTIONS

You can 'trigger' the operation of the RY502A three (3)
different ways:

1. Momentarily press the 'DOOR' release pushbutton on
your intercom or video-intercom apt. station to send the
door release voltage into the RY502A 8-24VAC voltage
input.

2. Using a separate power source/transformer, momen­tarily apply a voltage of 8VAC to 24VAC into the two
(2) RY502A terminals marked DO INPUT 8-24VAC.

3. Using a small screwdriver, momentarily (and carefully),
short the two (2) vertical testing pins on the RY502A,
marked J1 (see Fig 1.). These pins can be found in the
upper left hand portion of the board just below and to the
right of the transistor marked Q1. NOTE: These pins
are only provided to assist the installer in testing and
troubleshooting the RY052A and should not be used for
any other purpose.

Once the RY502A has been 'triggered', the following se­quence of events should occur:

1. Immediately the OUTSIDE door release (16VAC)
voltage and Form-C relay will activate, and the Red
LED marked LED2 will light for as long as this activation
takes place. This timed duration can be adjusted from
approx. 1 second to approx. 45 seconds, by using the
variable potentiometer located just above LED2. Note
the markings '1' and '45' to show the relative position of
the potentiometer for the timed duration you require.

2. After the OUTSIDE door release times out, the RY502A
looks for a 'jumper' across the terminals marked DO
INPUT 8-24VAC. That jumper can either be a physi­cal jumper wire or a set of contacts off the door switch
on the Outside Door (in man-trap applications). Imme­diately the INSIDE door release (16VAC) voltage and
Form-C relay will activate, and the Red LED marked
LED3 will light for as long as this activation takes place.
This timed duration can be adjusted from approx. 1
second to approx. 45 seconds, by using the variable
potentiometer located just above LED3. Note the mark­ings '1' and '45' to show the relative position of the
potentiometer for the timed duration you require. NOTE:
in 'man-trap' applications, the Inside Door will not
activate until the door contact switch for the Outside
Door closes.

3. After the INSIDE door release times out, the RY502A
will be in the 'ready' mode and can be activated again.

NOTE: Operating instructions are shown based upon the
RY502A being connected to the 8-24VAC door release
output of an intercom or video-intercom system amplifier/
control unit, and to an Outside and an Inside building door
release device. These instructions are applicable to other
applications as well. Call our sales or technical dept. for more
information on compatibility with other specialty applications.

To operate (or to test) the RY502A, make sure the 16VAC
power is connected and the Green 'Power On' LED is lighted.

2