Comdial Dxp Plus Instructions Manual

Installing The Switchable Power Supply In The
DXP Plus Common Equipment Cabinet
1.0 Introducing The Switchable Power Supply
This publication discusses the installation of the switchable IEC 950 approved 120/230 volt power supply
assembly for the DXPPlusmain and expansion common equipment cabinets. The voltage ranges of this power
supply assembly is as follows:
·90–129 VAC at 50/60 Hz
·200–254 VAC at 50 Hz
The power supply assembly is packed separately from the common equipment cabinet; therefore, you...

2.0 Understanding System Grounding Requirements
Transient voltage spikes, if induced onto CO or CENTREX lines, can travel through the cable and into the
common equipment. The telephone company offers basic protection against this condition but it is usually
designed to protect the central office circuits. While it will also provide some protection to the common
equipment, you should not rely upon it for total protection. To help ensure that external over-voltage surges do not
damage the system, you...

PLUS073
Grounding Terminal Two Grounding TerminalsGrounding Terminal
Grounding Terminal
Typical Earth Ground
No. 6 Solid Copper
Wire To Earth Ground
From Main Cabinet
No. 10 or 12 Solid Copper
Wire Between Cabinets
Grounding The System
Installing The Switchable Power Supply IMI89–196
Installing The Switchable Power Supply – 3 

3.0 Matching The Source Voltage
The factory ships theswitchablepower supply set for 230 VAC operation. If you plan to operate the power supply
from a 120 VAC source, you must set the voltage selection switch for that input. The switch is located at the
upper right edge of the power supply assembly. Slide the switch actuator to the setting that matches the AC source
voltage available at the installation site.
CAUTION
Be sure that you set the power supply for the proper source voltage. An improper setting...

4.0 Installing The AC Power Plug
The line cord is terminated with a typical continental European plug matching the CEE 7/7 standard. If this plug
does not meet the site needs, you can install a plug of the proper type for your installation.
To install a line cord plug,
·familiarize yourself with the requirements for the plug that you plan to install on the unterminated line cord (the
illustration shows a typical continental European plug matching the CEE 7 standard),
·strip off the insulation from the...

5.0 Installing The Power Supply
NOTE: The common equipment cabinet employs an electronic switching power supply. During operation, power
supplies of this type generate an audible sound from their switching regulators.  This sound is normal and
is not an indication that the power supply is operating improperly.
Install the power supply assembly in the common equipment cabinet per the following discussion and illustration.
1. Be sure to ground the common equipment cabinet per the instructions in the...

6.0 Making The AC Power Connection
·For the main cabinet’s AC power connection, employ a dedicated 15 AMP circuit, with a third-wire ground and
supplied to a standard electrical outlet. Remember, this electrical outlet must be located within four feet of the
common equipment cabinet. Remember also, you may need to supply two 15 AMP dedicated electrical outlets,
each protected by its own circuit breaker, if you plan to later install expansion cabinets.
NOTE: If you install the optional battery back-up...

7.0 Measuring The Power Supply Voltages
If you need to measure power supply voltages, you can do so at the DC voltage connector. Measure the power
under the following conditions:
·AC line cord connected to the AC outlet,
·DC power cable disconnected from power supply’s DC voltage connector,
·AC power switch turned on.
Measurement details are shown in the illustration.
CAUTION
For new installations, once you have measured the power supply voltages, turn off the AC power switch
and disconnect the AC line...

Power Supply Measurements
Measure Between Terminals
Measured Values
+ Voltmeter
Lead- Voltmeter
Lead
Pin 1 Pin 3
- 36 VDC +1.0V / -0V
Pin 5 Pin 7+ 5 VDC  +/-3 V
Pin 6 Pin 7- 5 VDC   +/-3 V
Pin 8 Pin 7
0 volts = normal operation
+ 5 V nominal = thermal overload
(press reset switch)
On = -36 VDC
On = +5 VDC
On = -5 VDC
On = Thermal Overload
On = Battery Backup Connected
Pins 1 & 2 = -36 V Ground
Pins 3 & 4 = -36 VDC
Pin 5 = +5 VDC
Pin 6 = -5 VDC
Pin 7 = Digital & Analog Ground
Pin 8 =Thermal Overload...

Installing The Switchable External Battery Assembly On
The DXP Plus Digital Communications System
1.0 Introducing The External Battery Assembly
The external battery assembly is for use with the DXPPlusdigital communications system. Unpack and carefully
inspect all equipment for shipping damage.  Notify the shipper immediately of any damages found. Verify that the
packages contain all parts and accessories needed for proper installation and operation. The assembly includes the
following items:
·Batteries:...