Comdial Dxp Plus Instructions Manual
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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 should unpack and carefully inspect it for shipping damage and notify the shipper of any damages you find. Also, verify that the package contains all parts and accessories needed for proper installation and operation. Refer to IMI66–105,Installation Instructions DXPPlusMain Cabinet Assemblyfor complete installation instructions of the main DXP plus cabinet and to IMI66–106,Installation Instructions DXP Plus Expansion Cabinet Assemblyfor complete installation instructions of the DXP plus expansion cabinet. The power supply assembly is protected with a 6.3A, 250V slow-blow fuse. A replacement fuse must have the same rating. NOTE: Both the switchable power supply assembly employ electronic switching circuitry in their design. 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. R This manual has been developed by Comdial Corporation (the “Company”) and is intended for the use of its customers and service personnel. The information in this manual is subject to change without notice. While every effort has been made to eliminate errors, the Company disclaims liability for any difficulties arising from the interpretation of the information contained herein. The information contained herein does not purport to cover all details or variations in equipment nor to provide for every possible contingency to be met in connection with installation, operation, or maintenance. Should further information be desired, or should particular problems arise which are not covered sufficiently for the purchaser’s purposes, contact Comdial, Inside Sales Department, Charlottesville, Virginia 22906. Printed in U.S.A.IMI89-196.01 7/95
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 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 DXP 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 impedance 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. Effective grounding requires that you connect the frame ground to a good earth ground. A good earth ground is one such as the ground bus in the premises’ AC power panel 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 expansion cabinet (available through the ground stud on the expansion 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 impedance of the wiring between the DXPPlusand the earth ground must not exceed 0.25 ohms and the impedance between the earth ground and the power company’s reference standard ground must not exceed 5 ohms. Use an acceptable low impedance measuring device to measure the impedance of these paths. The #6 or larger wire size will minimize the wiring impedance; however, if the impedance 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. IMI89–196 Installing The Switchable Power Supply 2 – Installing The Switchable Power Supply
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 can result in equipment damage. Voltage Selector Switch (Slide Actuator To Setting That Matches The AC Source Volage) PLUS076 Matching The Source Voltage IMI89–196 Installing The Switchable Power Supply 4 – Installing The Switchable Power Supply
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 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 LineBrown Black Installing The Switchable Power Supply IMI89–196 Installing The Switchable Power Supply – 5
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 previous paragraph before installing the power supply assembly. 2. Remove the power supply assembly from the carton. Be sure to save the small bag containing the mounting hardware. 3. Slide the power supply into the opening at the top right side of the common equipment main cabinet until the assembly’s front panel contacts the side of the cabinet. 4. Locate the power cable routed from the backplane and connect it to the power supply’s mating connector. 5. Remove the four #6 thread-forming screws from the hardware bag and secure the power supply assembly to the equipment cabinet. CAUTION The power supply is fan cooled. If air flow to the fan is blocked or the fan is out of service for any reason, the power supply can overheat. If the power supply overheats, theThermal Overloadindicator lights, and the 36 VDC output voltage shuts off. PLUS075 Typical Common Equipment Cabinet Power Supply Assembly Machine Screw (4 Places) Installing The Power Supply IMI89–196 Installing The Switchable Power Supply 6 – Installing The Switchable Power Supply
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 assembly, you can use this same outlet to supply AC power to that assembly’s battery charger. ·To provide protection against surges and spikes that may appear on the AC line, install a plug-in power line surge protector between the AC power cord of the installed equipment and the AC outlet.. CAUTION DO NOT attach or secure the line cord to the surface of the mounting location in any manner. Plug-In Power Line Surge Protectors Typical Earth Ground Power Cable Two Dedicated 117 VAC 15 Amp NEMA 5-15R Electrical Outlets With Third Wire Ground (Each Is Protected By Its Own Circuit Breaker.) PLUS038 Two 15 AMP Circuit Breakers Ganged Together Making The AC Connection Installing The Switchable Power Supply IMI89–196 Installing The Switchable Power Supply – 7
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 cord from the outlet. Leave the AC power disconnected until you have installed the circuit boards in the equipment cabinet. 8.0 Identifying The Fuse The power supply fuse is aslow-blowtype rated at 6.3 AMPS and 250 VOLTS. A replacement fuse must have the same rating. IMI89–196 Installing The Switchable Power Supply 8 – Installing The Switchable Power Supply
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 Signal PLUS070On/Off Switch Fuse 6.3A, 250V Slow Blow Type Reset Switch (Press If Thermal Overload Indicator Turns On) Source Voltage Switch Measuring The Power Supply Voltages Installing The Switchable Power Supply IMI89–196 Installing The Switchable Power Supply – 9
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: Five 6-volt, 50 ampere-hour, (Comdial product code BT000-141), charger unit and interface cables. ·Metal enclosure with wire harness, includes combination circuit breaker, on/off switch Should the AC power to the system be interrupted, one BB480 external battery assembly provides the following minimum power capability: ·1.0 hour of operation for a fully loaded system. Calculate the minimum battery backup time provided by a battery assembly to a fully configured DXP Plus system using the following formula: T=Back-up time in hours K=0.82 (Constant) e=50 (ampere-hour capacity of battery assembly) N=Total number of stations Example: Assume that you have installed a DXPPluswith three cabinets supporting 472 telephones and containing one line board along with a battery assembly to provide back-up power. During AC operation, the battery assembly accepts re-charging current to maintain the voltage potential of its batteries at an operational level. NOTE: The BB480 external battery assembly requires approximately 10 hours to completely re-charge to full potential after it has been completely discharged and, in some cases, when initially installed. T=Ke 1 + [(0.084) (N)] T=(.82)(50) 41.0 1 + [(0.084) (472)]= 40.65= 1.0 Hour R This manual has been developed by Comdial Corporation (the “Company”) and is intended for the use of its customers and service personnel. The information in this manual is subject to change without notice. While every effort has been made to eliminate errors, the Company disclaims liability for any difficulties arising from the interpretation of the information contained herein. The information contained herein does not purport to cover all details or variations in equipment nor to provide for every possible contingency to be met in connection with installation, operation, or maintenance. Should further information be desired, or should particular problems arise which are not covered sufficiently for the purchaser’s purposes, contact Comdial, Customer Service Department, Charlottesville, Virginia 22906. Printed in U.S.A.IMI89–197.02 11/95