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 4. Power Supply
____________ **ON A/C 001-049, 051-099, 101-105, 201-299,
 (Ref. Fig. 008) **ON A/C 151-199,
 (Ref. Fig. 008A) **ON A/C 001-049, 051-099, 101-105, 201-299,
 (Ref. Fig. 009) **ON A/C 151-199,
 (Ref. Fig. 009A) **ON A/C 001-049, 051-099, 101-105, 201-299,
 (Ref. Fig. 010) **ON A/C 151-199,
 (Ref. Fig. 010A) **ON A/C 001-049, 051-099, 101-105, 151-199, 201-299,
 (Ref. Fig. 011)
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 Power Supply - CIDS Director, FAP and PTP
 Figure 008

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 Power Supply - CIDS Director, FAP and PTP
 Figure 008A

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 Power Supply NORM BUS - Top Line
 Figure 009

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 Power Supply NORM BUS - Top Line
 Figure 009A

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 Power Supply ESS BUS - Top Line
 Figure 010

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 Power Supply ESS BUS - Top Line
 Figure 010A

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 Power Supply - Middle Line
 Figure 011

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 The service bus 601PP and the essential bus 401PP supply electrical power to
 the CIDS.
 The CIDS can operate in the normal mode or in the emergency mode.

 A. Normal Mode In the normal mode the CIDS uses 28 V DC supplied from the service bus 601PP. The DIR 2 is in standby.
 B. Emergency Mode
 (1)
 In the emergency mode the essential bus 401PP supplies 28VDC to the CIDS. The emergency system is used if there is a failure of the service bus 601PP and the essential bus 401PP is available. The power consumption is reduced to a minimum. The standby DIR 2, the PTP and the FAP are not supplied. The system operates with these minimum functions:

 -
the PA system,

 -
the Cabin Interphone,

 -
the EVAC (if installed).

 (2)
 Power transfer switching (Ref. Fig. 008) If there is no electrical power from the service bus 601PP, the essential bus 401PP supplies the DIR 1. If the DIR 1 fails, the power transfer relay 105RH switches the essential power supply to DIR 2.

 (3)
 Top-Line cut-off switching (Ref. Fig. 010) If there is no electrical power from the service bus 601PP, the essential bus 401PP supplies the Top-Lines only when an audio signal is present. If there is no audio signal the respective director operates the Top-Line cut-off relay 106RH to stop the essential power supply to the Top-Lines.

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 **ON A/C 151-199,

 The service bus 601PP and the essential bus 401PP supply electrical
 power to the CIDS.
 The CIDS can operate in the normal mode or in the emergency mode.

 A. Normal Mode In the normal mode the CIDS uses 28 V DC supplied from the service bus 601PP.
 B. Emergency Mode
 (1)
 In the emergency mode the essential bus 401PP supplies 28VDC to the CIDS. The emergency system is used if there is a failure of the service bus 601PP and the essential bus 401PP is available. The power consumption is reduced to a minimum. The PTP and the FAP are not supplied. The system operates with these minimum functions:

 -
the PA system,

 -
the Cabin Interphone,

 -
the EVAC (if installed).

 (2)
 Power transfer switching (Ref. Fig. 010A) If there is no electrical power from the service bus 601PP, the essential bus 401PP supplies the top-lines only when an audio signal is present. If there is no audio signal the respective director operates the top-line cut-off relay 106RH to stop the essential power supply to the top-lines.

 **ON A/C 001-049, 051-099, 101-105, 151-199, 201-299,
 5. Interface
_________
 A. CIDS Equipment Connections
 (1) The CIDS Director 101RH (102RH) is connected to:
　
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