Valcom VP-624B Service Manual

VP-624B

24 VOLT DC POWER SUPPLY

INTRODUCTION

These instructions provide identification,
installation, connection, operation, and
maintenance information for the VP-624B, fully
regulated, 24VDC, 0.6 Amp Electronic Power
Supply.

UL Information

CAUTION:

To reduce the risk of fire or electric shock,
connect directly to a 3 prong grounding
receptacle.

To reduce the risk of electric shock,
disconnect power to the receptacle before
installing or removing the unit. When
removing receptacle cover screw, cover may
fall across plug pins or receptacle may
become displaced.

Use only with duplex receptacle having
centerscrew.

Secure unit in place by receptacle cover
screw.

This power unit is intended to be properly
orientated in a vertical or floor mount
position.

IDENTIFICATION

Applications

• Valcom page control units

• Valcom one-way amplified speaker

assemblies

• Any application where 24VDC filtered talk
battery is required

Features

• Regulated 24VDC "A" filtered battery

• Thermal overload protection

• Floating output

• Short circuit protected

• UL Listed

Issue 10

Capacity

• Current: 0.6 Amp at 25° C

Dimensions/Weight

• 5.50"H x 3.30"W x 3.25"D
(13.97cm H x 8.38cm W x 8.26cm D)

• 1.6 lbs. (.73 kg)

Nominal Specifications

• Output: 24VDC +/- 3V "A" filtered battery
(Ripple 10mV maximum)

Power Requirements

• Input: 105 to 120VAC, 60Hz, 36 Watts

Environment

• Temperature: 0 to 50° C

• Humidity: 0 to 85% non-precipitating

INSTALLATION

The VP-624B is a receptacle mount power
supply designed to be used with a third wire
grounded receptacle, a cold water pipe, or earth
ground may be connected to the positive (+)
screw terminal using 14 AWG ground wire. If a
two wire adapter is used, make sure the ground
tab is bonded to the local electrical ground.

1 947139

When installing Valcom one-way amplified
horns, connect the white and black wires of the
horn to the power supply (-) and (+) terminals
respectively.

Connections to Valcom Page Control

VP-624B

66 Block

Power
Supply

AC

-+

GND

A Ground
A Battery

B Ground
B Battery

When installing Valcom one-way amplified
speakers, connect the -24V and ground
terminals of the speaker to the power supply (-)
and (+) terminals respectively.

CIRCUIT DESCRIPTION

The VP-624B is a fully regulated 24VDC, 0.6
Amp power supply. The output is floating with
respect to ground. A greater than 0.6 Amp load
will cause the power supply to current limit.
Short circuit protection is provided.

TECHNICAL ASSISTANCE

When trouble is reported, verify that AC power is
being supplied to the unit.

To test the power supply, remove all output
connections and measure the output voltage with
a VOM. The voltage should be 24VDC +/- 3V. If
no voltage is measured, replace the unit.

Assistance in troubleshooting is available from
the factory. When calling, you should have a
VOM and a test set available and be calling from
the job site. Call [phone] and for
Technical Support, or visit our website at
http://www.valcom.com.

Valcom equipment is not field repairable.
Valcom, Inc. maintains service facilities in
Roanoke, VA. Should repairs be necessary,
attach a tag to the unit clearly stating your
company name, address, phone number, contact
person and the nature of the problem. Send the
unit to:

Valcom, Inc..

Repair and Return Dept.

5614 Hollins Road

Roanoke, VA 24019-5056

Valcom, Inc. warrants its products to be free from defects in materials and workmanship under conditions of normal use and service

VALCOM LIMITED WARRANTY

for a period of one year from the date of shipment. The obligation under this warranty shall be limited to the replacement, repair or
refund of any such defective device within the warranty period, provided that:

1. inspection by Valcom, Inc. indicates the validity of the claim;

2. the defect is not the result of damage, misuse, or negligence after the original shipment;

3. the product has not been altered in any way or repaired by others and that factory sealed units are unopened (a service

4. freight charges for the return of products to Valcom are prepaid;

5. all units ‘out of warranty’ are subject to a service charge. The service charge will cover minor repairs (major repairs will

This warranty is in lieu of and excludes all other warranties, expressed or implied, and in no event shall Valcom, Inc. be
liable for any anticipated profits, consequential damages, loss of time or other losses incurred by the buyer in connection
with the purchase, operation or use of the product.

This warranty specifically excludes damage incurred in shipment. In the event a product is received in damaged condition, the
carrier should be notified immediately. Claims for such damage should be filed with the carrier involved in accordance with the
F.O.B. point.

charge plus parts and labor will be applied to units defaced or physically damaged);

be subject to additional charges for parts and labor).

Headquarters:

Valcom, Inc.

5614 Hollins Road

Roanoke, VA 24019-5056

Phone: [phone]

FAX: [phone]

2 947139