Mitel SX 200 ML PABX Instructions Guide
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12 Bay Power Supply 12.1 The Bay Power Supply (BPS) is card-mounted and is located in the upper right slot of the cabinet. The electrical power characteristics are summarized in Table 12-l. 1 Table 12-l Electrical Input Power Characteristics Input Frequency Minimum Holdover Time Input Current 9109-008-000-SA 102 Vat to 47 Hz to 63 40 ms at 120 Vat or Maximum of: 2.OAmps Bay Power Supply 135 Vat Hz 20 ms at 102 Vat at 120 Vat (delivering full rated load) Electrical Characteristics 12.2 Power is derived from a commercial ac source or an Uninterruptible Power Supply (UPS). Table 12-2 Bay Power Supply Specifications Low range Frequency Waveform Commercial power lnverter power Current 102 Vrms to 135 Vrms. 102 Vrms to 135 Vrms. 2.0 A rms max. 47 Hz to 63 Hz. 47 Hz to 63 Hz. Sinusoidal, 5% THD Quasi-square wave, max. 0.71 duty cycle. Bay Power Supply 12.3 The BPS connects to the backplane through a card-edge connector at the rear of the card; also at the rear is an IEC receptacle which connects to a line cord from the sys- tem ac distribution (see Figure 12-I). BPS dimensions are: Width 5.1 cm (2.0 in.) Height 15.7 cm (6.2 in.) Depth 36.8 cm (14.5 in.) Bay Power Supply output voltages and test point voltages are shown in Table 12-2. Controls and Indicators The ON/OFF switch is mounted on the front of the BPS and is used to turn the power on or off to the unit. The upper LED indicates that the BPS is operating, and the lower LED is ON when the ringing amplifier is producing power (flashing in cadence with it). March 1997 Issue 1 Revision 0 12-l
Engineering Information Input and Output Protection The input to the converter is protected by a fuses. and by low voltage protection which shuts off the converter if the input voltage falls below the specified minimum. The converter will not be re-enabled until the input voltage returns to the specified minimum. The input also includes protection which limits the peak inrush current to 20 A. Each output is protected against short circuits, overloads, and overvoltage. The over- load/short circuit protection is self-resetting. Table 12-3 Bay Power Supply Test Point Voltages Voltage Range + 5 Vdc + 5.07 to +5.23 +12 Vdc +I 0.8 to +I 3.2 -12 Vdc -13.2 to -10.8 - 5 Vdc -5.5 to -4.5 -28 Vdc -30.8 to -23.8 -48 Vdc -53.76 to -40.8 90 Vat 63.0 to 99.0 Power Fail Sense The converter has a single alarm signal, PFS (power fail sense), which is driven low when the incoming ac falls below its minimum specified value. At this point there will be approximately 10 ms before the outputs fall out of regulation. FUSES 2.OA RINGING VOLTAGE FOR ONSlOPS TELEPHONE SETS 05A DC VOLTAGE FOR COV AND DNIC TELEPHONE SETS 12-2 Issue 1 Revision 0 Figure 12-I Bay Power Supply March 1997
13 Reserve Power Supply The reserve power supply is a stand-alone Uninterruptible Power Supply (UPS) com- prising a battery pack, a charger, and an inverter; it is not manufactured by Mite1 Corporation. The UPS backup time is dependent upon the unit selected and the ca- pacity of the batteries provided. The unit must meet the specifications provided below. Please note that compliance to electrical, installation, and building codes is the respon- sibility of the purchaser of the equipment. Consult local municipal and electrical utility authorities before proceeding with the installation of equipment. The UPS should be a true Uninterruptible Power Supply which always supplies the output load from its inverter. The UPS must include a reverse transfer switch to auto- matically bypass itself if it fails. The UPS must be capable of driving rectifier capacitor loads. Rating Input Voltage Output Voltage Output Waveform Transfer time Output Receptacle Holdup/Recharge Times 1.5 kVA minimum 120 Vrms +lO%,-15%, 60 Hz 15% 120 Vrms +iO%,-15%, 60 Hz 5% Sinewave or Quasi square wave (not square wave) Less than 30 ms (includes fail detection and transfer time) NEMA 15 A 3-pin grounded Per customer requirements. An Uninterruptible Power Supply (UPS) can have an external connection (from an internal relay) which provides a closed contact to remotely indicate status or condition. Conditions which may be indicated include: l an ALARM condition is present within the UPS l the UPS is operating from its batteries (probably because commercial ac power has been interrupted). The relay contact may be connected to a remote alarm or to a “Contact Monitor” line circuit to promptly indicate the condition. Refer to the manufacturer’s installation manual, which describes conditions that are indicated. Refer to the Features Descr@tion Practice, for a description of “Contact Monitor” line circuit operation. March 1997 issue 1 Revision 0 13-l
Engineering Information 13-2 Issue 1 Revision 0 March 1997
14 System Fail Transfer SFT Operation 14.1 In the event of a major alarm condition on the SX-200 ML PABX, the MCC II provides Control (relay contact) and power (-48V) signals to an external system fail transfer unit. The following conditions will cause system fail transfer: l Commercial power failure (if no reserve power supply is used) . Common control failure. The system fail transfer relays located on the System Fail Transfer (SFT) Card will connect Central Office (CO) trunks to selected station lines. Calls in progress when SFToccurs will be dropped; however, calls made while in SFT mode will not be dropped when the system returns to normal operation, but will terminate normally at the end of the call. PABX features are not available while SFT is in effect. March 1997 Issue 1 Revision 0 14-l
Engineering Information 14-2 Issue 1 Revision 0 March 1997