Valcom vp-4024c Service Manual
VSP-VP-4024C
Issue 5
VP-4024C
-24 VOLT DC POWER SUPPLY
INTRODUCTION
These instructions provide the specifications, installation and
maintenance information for the VP-4024C, -24 Volt Power Supply.
SPECIFICATIONS
The VP -4024C is a fully regulated -24VDC, 4 Amp power supply.
The primary is protected by a 2 Amp 5x20 mm fuse. The output is
floating with respect to ground, and the two outputs may be
connected together for one 4 Amp output. The regulator will
maintain -24 Volts ± 2.5 Volts over the rated range of input voltages
and output loads. A greater than 4 Amp load on power up will
cause the power supply to current limit. Short circuit protection is
provided. Over voltage is provided to limit the output voltage to
approximately -28 Volts should a failure occur within the power
supply.
“WARNING: To reduce the risk of fire or electric shock, do not expose
to rain or moisture.”
“WARNING: Shock hazard – Do Not Open.”
“AVIS: Risque de choc Electrique ne pas Ouvrir.”
“PELIGRO: Corriente Electrica – No Abres.”
CAUTION: For continued protection against risk of fire, replace only
Applications
The VP-4024C is designed to be used with:
• All Valcom page control units that require -
24VDC
• Valcom one-way amplified speaker assemblies
that require -24VDC
• Any application where -24VDC filtered talk
battery is required
with 2A, 125V SLO-BLO type fuse 5x20 mm, UL Listed.
Design Features
• Regulated -24VDC "A" battery
• Two 2 Amp outputs
• Outputs may be connected for one 4 Amp output
• Input fuse protected
• LED indication of operation
• Full current limiting
• Over voltage protection
• Floating output
• Full electronic supply
1 947725
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION: To reduce the risk of electric shock,
Do not remove cover.
No user serviceable parts inside.
Refer servicing to qualified service personnel.
This symbol indicates that dangerous
voltage constituting a risk of electric
shock is present within this unit.
This symbol indicates that there are
important operating and maintenance
instructions in the literature accompanying
this unit.
Nominal Specifications
Power Requirements
Input Voltage: 105-120VAC, 60Hz, 150 Watts max
Dimensions: 10.70"H x 6.35"W x 3.75"D
(27.18cm H x 16.13cm W x 9.53cm D)
Weight: 12 lbs. (5.44 kg)
Output Characteristics: -24VDC regulated ±10%
"A" battery
Ripple 10 millivolts RMS max
Two 2 Amp outputs
Environmental
Operating Temperature: 0 to +40° C
Cooling: Free Air Convection
Humidity: 10 to 90% (Non-condensing)
INSTALLATION
Mounting
The VP-4024C is designed for wall mounting only.
The unit should be mounted within seven feet of an
AC receptacle.
Screw mounting plate to wall and position power
supply on mounting plate via the mounting slots.
Precautionary Notes:
Power Connections
Use a cord set consisting of a minimum 18 AWG cord
and grounding type attachment plug rated a minimum
of 15A, 250V. The VP-4024C is provided with a
NEMA 5-15 UL Recognized cord set for North
American use.
Connections
• Connections to Valcom page control units are
shown in Figure 1.
• When using the VP-4024C with Valcom page
equipment, strap either of the "+" outputs to a
reliable ground reference point.
• When installing Valcom one-way amplified horns,
connect the white and black wires of the horn to
the power supply "-" and "+" terminals
respectively.
• Multiple power wire runs may be originated at the
VP-4024C by utilizing a connection block.
• When installing Valcom one-way speakers,
connect the 24VDC and GND terminal s of the
speaker to the "-" and "+" terminals respectively.
• Plug power supply into wall outlet.
TECHNICAL ASSISTANCE
When trouble is reported, verify the unit is properly
connected and there are no broken connections
leading to this unit.
Assistance in troubleshooting is available from the
factory. When calling, you should have a VOM and a
test set and be calling from the job site. Call (540) 5632000 and ask for Technical Support, or call (540) 7671555 for Valcom 24-hour Faxback System 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 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
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