Lathem DWA-S User Manual

Sonachron® (DWA-S)

User’s Manual

Lathem Time Corporation

200 Selig Drive, SW

Atlanta, GA 30336

1-800-241-4990

1-404-691-0400

www.lathem.com

Document No. OMSC-0708

Copyright © 2008 Lathem Time Corporation.

All rights reserved.

TABLE OF CONTENTS

SPECIFICATIONS..................................................... 1

INTRODUCTION ....................................................... 2

QUICK START STEPS.............................................. 3

DIP SWITCH SETTINGS........................................... 8

PROGRAMMING A SECURITY CODE ..................... 9

UNLOCKING THE KEYPAD.................................... 10

SETTING TIME AND DATE .................................... 10

PROGRAMMING EVENTS (On/Off Controller) ....... 11

PROGRAMMING EVENTS (Bell Ringer)................. 12

PROGRAMMING SIGNAL LENGTH (Bell Ringer) .. 12

MANUAL LUNCH AND BREAKS (Bell Ringer) ....... 13

SIGNAL ON/OFF..................................................... 14

MANUAL OPERATION............................................ 14

STANDBY POWER ................................................. 14

RS485 SYNCH ........................................................ 15

WIRING DIAGRAMS ............................................... 15

WARRANTY ............................................................ 24

SPECIFICATIONS

Signal Duration Programmable – 1 to 99 secs

Daylight Savings Automatic (Disable by dip switch)

Time Display 12 or 24 hr selectable

Comm Port RS485 – Receiver

Relays 10 Amp Dry Contact

Temperature Range 0 C to 60 C

Voltage Range +/ - 10 % of input voltage

Shipping Weight 7 lb

Dimensions 9 ¾”x 3 ¼”x 5 3/8”

WARNING: This equipment generates uses and can radiate
radio frequency energy and, if not installed and used in
accordance with the instruction manual, may cause interference
to radio communications. It has been tested and found to
comply with the limits for a Class A computing device pursuant to
Subpart J of Part 15 of FCC Rules, which are designed to
provide reasonable protection against such interference when
operated in a commercial environment. Operation of this
equipment in a residential area is likely to cause interference, in
which case, the user, at his own expense, will be required to take
whatever measures may be required to correct the interference.

Input Voltage 115 VAC (220 Optional)

Input Frequency 50/60 Hz

Input Power 20 Watts Max

Standby Power 1.2 Ah, 6 V battery

Standby Time 10 Days

Timing Accuracy Per line frequency

Number of Events 1440 (any combination of weekdays)

Page 1

INTRODUCTION

The DWA-S is a single circuit signaling device which can be
used as a bell ringer or on/off controller. It is capable of retaining
up to 1440 separate events for each day of the week in memory
plus a floating lunch and break schedule which can be activated
with a single key on the keypad or a remote switch. Automatic
adjustment for daylight savings time change is also provided. A
liquid crystal display on the front of the unit displays the current
time (in 12 or 24 hour format), date, and day of the week, bell or
on/off control status, programming prompts, and indication of
operation on standby power. A 24-button keypad is used for
setting time, programming events, manual operation of bells or
controls, initiating lunch or break bells, and on/off control of the
schedule. Access to programming functions and manual keys
(MANUAL, START LUNCH, and START BREAK) is controlled by
a user defined security code.

The time keeping ability of the DWA-S is dependent on the
power source frequency. A switch setting selects operation
based on 50 or 60 Hz. During A.C. power failures, the unit
switches to a quartz crystal time base and a 6 volt battery allows
the unit to continue to keep time and retain all data for 10 days.
Upon power resumption, the battery automatically recharges with
current limited to 1.5 Amperes.

Page 2

QUICK START STEPS

3. Disconnect cable connector from right side of front panel.

4. Slide front panel left and remove completely.

5. Find a suitable location on the wall that allows at least 10
inches of clearance on the left side to allow the front panel to
slide on and off.

6. Mark 3 hole positions on wall for mounting the unit.

7. Remove plastic bushing from back of unit before mounting
on the wall.

8. Drill marked holes and install wall anchors in wall if
necessary (not provided).

Mark Holes

Step 1 – Mount Unit to Wall

1. Unscrew 2 left screws to remove left side panel.

2. Slide front panel left.

Page 3

Page 4

9. Secure unit to wall using screws (not provided).

Step 2 – Swith Off Power to AC Circuit

1. SWITCH OFF THE CIRCUIT THAT WILL FEED AC POWER
TO THE UNIT BEFORE PROCEDING.

Step 3 – Connect Wires for 115VAC or 24VAC Bells

IMPORTANT! This unit is shipped from the factory as a Bell
Ringer. To change to an ON/OFF controller, see DIP Switch
Setting on page 8. This section provides instructions for
wiring 115VAC or 24VAC bells, see Wiring Diagrams on
pages 20 – 22 for other options.

1. There are three options for routing wires into the DWA-S:
top, back or bottom. Select on of these and remove the plug.

2. Remove cover from terminal strip.

Drill Holes

Wall

Anchor

IMPORTANT: DO NOT PROCEED IF WIRE COLORS ARE

Replace Cover

Power Switch

DIFFERENT THAN SHOWN OR IF YOU ARE UNSURE
WHICH WIRES ARE AC HOT, AC NEUTRAL AND
GROUND. THERE IS RISK OF PERSONAL INJURY AND
DAMAGE TO THE UNIT THAT’S NOT COVERED BY
WARRANTY. INEXPENSIVE TESTERS ARE AVAILABLE
AT YOUR LOCAL HOME ELECTRICAL SUPPLY STORE
FOR VERIFYING WIRES.

3. Connect wires from power cord as follows: green (ground)
wire to “GND”, white (AC neutral) wire to Line Neutral, and
black (AC Hot) wire to Line Hot.

4. For 115VAC bells or horns, connect a jumper wire between
Line Hot and CKT 1A. Connect the bell wires to AC Neutral
and CKT 1B.

5. For 24VAC bells or horns, connect a jumper wire between
AC Hot and CKT 1A. Connect the transformer
115VAC/primary wires to AC Neutral and CKT 1B. Connect
the transformer 24VAC/secondary wires to the 24 V bells or
horns.

NOTE: See pages 20 - 22 for other wiring options that use
the COM, BREAK and LUNCH terminals.

Step 4 – Turn on Power Switch

1. Press cover onto Terminal Block.

2. Set Power switch to up position.

Page 5

Step 5 – Secure Cover

Step 8 – Restore Power to AC Circuit

1. MAKE SURE THE SIDE COVERS ARE SECURE THEN

SWITCH ON THE AC POWER TO THE CIRCUIT
FEEDING POWER TO THE UNIT.

Reconnect Cable

Red Battery

1. Align front panel in track and slide half way to right.

2. Secure ribbon cable on right edge of front panel.

3. Slide front panel all the way closed making sure that the
cable lays down.

4. Attach red battery wire onto battery post.

5. Secure left side panel with the screws.

Page 6