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...

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...

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...

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...

Engineering Information 
14-2 
Issue 1 Revision 0 
March 1997