Comdial Dxp Plus Instructions Manual

							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 should install and properly ground primary protection devices, such as gas discharge
tubes or similar primary protection devices, on all lines. While the line boards have internal secondary surge
protection on all line ports, in order for this protection to be effective, youMUSTconnect the common equipment
cabinet to a reliable, effective earth ground.
Proper grounding is necessary for trouble-free operation and personnel safety. The DXPPlushas the following
three types of grounds:
·Service Ground —a neutral power line wire that is connected to the ground bus in the premises’ AC power
panel,
·System Ground—a non-current carrying power line wire that is connected to the ground bus in the premises’
AC power panel,
·Frame Ground—a low impedence conductor that places the common equipment cabinet at reference ground
potential. The frame ground provides the greatest safety by limiting electrical potential between non-current
carrying parts of the system. The common equipment cabinet provides a ground stud on its cabinet for access to
its frame ground.
The entire system is effectively earth-grounded when you permanently connect the common equipment cabinet,
all expansion cabinets, and the battery back-up assembly to earth or to some conducting body which serves in
place of earth.  The ground path must be of sufficient current-carrying capacity to prevent a build up of voltages
which may result in circuit noise, hazard to personnel, or equipment damage.
An acceptable earth ground is one such as the service ground for the AC power or a public metallic cold water
pipe at a point immediately at its entrance to the premises and ahead of any meters, pumps, or insulating sections
that have been added for vibration reduction. Avoid using the premises’ structural steel frame as it may not be at
earth ground potential. Use #10–12 or larger insulated solid copper grounding wire to connect the frame ground of
the battery assembly cabinet (available through the ground stud on the cabinet’s side) to the frame ground of the
main common equipment cabinet. Use #6 or larger insulated solid copper grounding wire to make the ground
connection from the main cabinet’s frame ground to earth ground.Keep this ground wire separate from the
three-wire AC line cord, do not splice it, and keep it as short as possible.
The impedence of the wiring between the common equipment cabinet frame ground and the earth ground must not
exceed 0.25 ohms and the impedence between the earth ground and the power company’s reference standard
ground must not exceed 5 ohms. Use an acceptable low impedence measuring device to measure the impedence of
these paths. The #6 or larger wire size will minimize the wiring impedence; however, if the impedence between
earth ground and the power company’s standard reference ground exceeds 5 ohms, contact the local power
company. The ground path must always be of sufficient current-carrying capacity to prevent a build up of voltages
that may result in circuit noise, hazard to personnel, or equipment damage.
Be sure that all of the ground connections are visible for inspection and maintenance. Tag all of the ground
connections with a sign that reads:Do Not Remove or Disconnect.
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							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
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							3.0 Matching The Source Voltage
The factory ships the switchable battery back up charger assembly set for 230 VAC operation. If you plan to
operate the charger from a 120 VAC source, you must set the voltage selection switch for that input. The switch is
located at the lower left edge of the charger chassis. Slide the switch actuator to the setting that matches the AC
source voltage available at the installation site.
Voltage Select Switch
PLUS074
Matching The Source Voltage
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							4.0 Installing The AC Power Plug
The charger assembly’s 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 line cord wires according to the requirements for your plug,
·open the plug and slide its outer shell onto the line cord,
·connect the ground, neutral, and line wires according to the requirements for your plug,
·if your plug includes a clamp, tighten it on the line cord,
·reassemble the plug,
Test the installation for open and short circuits using an ohm meter.
L3
L1
L2Neutral (Blue)
Ground (Green/Yellow)
Line (Brown)
L1, L2, and L3= strip length requirements
Inside Of PlugLine (Brown)
Ground (Green/Yellow)
Clamp
Neutral (Blue)
PLUS069
Installing A Typical Continental European AC Power Plug
Standard Wire Color
Power
SourceWire Color
Europe USA
Line Brown Black
Ground Green/Yellow Yellow
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							2.0 Mounting The Charger Chassis
You must mount the charger chassis to the battery cabinet; however, the particular position that you chose for this
mounting depends upon the method that you plan to mount the cabinet at the DXPPlussite.
·If you plan to mount the battery cabinet on a backboard at the side of the common equipment cabinets, you
must attach the charger, with its cables pointing toward you, to the left end of the battery cabinet as you face the
cabinet’s battery opening.
·If you plan to mount the battery cabinet below the main common equipment cabinet on the same backboard
(single common equipment cabinet installations), you must attach the charger, with its cables pointing toward
you, to the right end of the battery cabinet as you face the cabinet’s battery opening.
·If you plan to mount the battery cabinet on the back side of a standard 23–inch double equipment rack with the
common equipment cabinets mounted to the front side of the rack, you must attach the charger, with its cables
pointing away from you, to the to the left end of the battery cabinet as you face the cabinet’s battery opening.
To mount the charger chassis,
1. Choose the method of battery cabinet mounting, and orient the charger so that it is facing properly for the
mounting scheme.
2. Remove the front panel from the empty battery cabinet, and save the retaining hardware.
3. Remove the wiring access plate from the end of the battery cabinet.
4. Route the black battery connection wires through the wiring access hole.
5. Attach the charger chassis to the battery cabinet with the three supplied screws.
Charger Chasis
Wiring Access Plate
Battery Cabinet
Screws (3 Places)
bb480k
Mounting The Charger For Separate Backboard Installations
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							Charger Chasis
Wiring Access Plate
Battery Cabinet
Screws (3 Places)
bb480j
Mounting the Charger For Double Rack Installations
bb480L
Screws (3 Places)
Charger Chasis
Wiring Access Plate
Battery Cabinet
Mounting The Charger For Below Main Cabinet Installations
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							3.0 Mounting The Battery Cabinet.
CAUTION
The complete battery back up assembly is heavy. The charger chassis, empty battery cabinet, and wiring
weigh approximately 25 pounds and all the batteries together weigh approximately 130 pounds for a
combined assembly hanging weight of approximately 155 pounds.
You can mount the battery cabinet at several different locations.
·You can mount the battery cabinet on a separate backboard located to the right of the common equipment
cabinet location. Locate the battery cabinet as detailed in the illustration on the facing page.
·At sites that employ only a main equipment cabinet, you can mount the battery cabinet directly below the main
common equipment cabinet on the same backboard.
·You can mount the battery cabinet in the middle of a standard 23–inch equipment rack if you wish. This can be
a companion rack set next to the one where you have mounted the DXPPluscabinets. Alternately, you can use
a self-supporting, two-sided rack with the DXPPluscabinets mounted on one side and the battery cabinet
mounted on the other side directly behind and slightly above the main common equipment.
Remember from theSection 2.0discussion, you must attach the charger chassis to the battery cabinet in a
orientation that supports the cabinet mounting.
NOTE: The following instructions describe how to mount the battery cabinet using a backboard.
1. Add a second backboard to the right of the backboard that supports the DXPPluscommon equipment cabinet.
Be sure that this backboard bridges the studs that support the underlying wall material. Securely attach the
backboard to the mounting surface. (Suitable backboards are available commercially or you can construct one
out of 3/4-inch plywood.) You must drive the hardware that secures the backboard to the mounting surface
into the underlying wall studs instead of just into the wall material alone.
2. Refer to the illustration for the locating dimensions required for the mounting screws, and mark their locations
on the backboard. You must attach the cabinet vertically to the backboard.
3. Drill holes in the backboard of a proper size to accommodate the hardware being used.
4. Insert the two top screws into the backboard and tighten them to within approximately 1/8–inch of the surface.
5. Hang the cabinet on the top screws using the top mounting holes in the rear mounting flange of the cabinet.
Note that these holes are elongated with an enlargement at one end. This feature allows the cabinet to slide
down on the screws to secure the mounting when the cabinet is hung on them.
6. Use the openings for the middle and lower set of mounting screws as a guide, and mark the location for the
remaining screws.
7. Lift the cabinet from the top screws and set it aside while preparing the holes for the remaining screws.
8. Rehang the cabinet as discussed in step 6.
9. Insert the lower screws into the backboard and tighten them to within approximately 1/8-inch of the surface.
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							Mounting The Battery Cabinet
BB480a
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							3.0 Assembling and Wiring The Batteries In The Cabinet
3.1 Installing The Batteries
Install the batteries in the cabinet with their terminals facing the cabinet opening. The batteries set in place, and
you do not need to anchor them to the cabinet.
PLUS003
Installing The Batteries
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							3.2 Strapping The Batteries
You must strap the batteries together using the supplied strapping bars and hardware. Use three strapping bars at
each strapping location, and install the hardware as shown in the illustration.
# 10-32 Machine Screw
#10 Flat Washer
Battery Straps
Battery Terminal
#10 Flat Washer
#10 Lockwasher
#10 Hex Nut
bb480h
Attaching The Strapping Hardware
BB480c
Strapping The Batteries
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