Mitel SX 200 ML PABX Instructions Guide

							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). 
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							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 
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Figure 12-I Bay Power Supply 
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							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. 
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							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. 
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