Replacing A Power Supply Unit - BT Inspiration Installation & Maintenance Manual

BBU Connector
Pin 1 0 Volts
Pin 2 49 Volts
Pin 3 Not used
Pin 4 0 Volts
Pin 5 Not used
Pin 6 41.5 Volts

Replacing a power supply unit

Before replacing the power supply, please verify that the mains fuse and the power supply fuse have
not blown. See Caution below.
The mains fuse is a standard 250 Volt 3A device
The power supply fuse is a 20mm 250V 1.6A HT device (anti-surge ceramic body, high rupture
capacity)
The Battery back up charging circuit in the BBU case has a fuse on the circuit board
20mm 6.3A H T device. See next section for battery isolation fuse.
The power supply fuse is located beside the mains lead screw terminal connectors on the power
supply circuit board, which is located under the power supply cover.
CAUTION
The power must be disconnected before removing or installing the PSU
• Disconnect the power.
• Disconnect the battery if fitted (See previous instructions).
• Remove the power supply cover.
• Disconnect the mains lead.
• Disconnect the lead to the main PCB.
• Unscrew the two retaining screws and lift out the PCB.
• Re-insert the new power supply.
• Insert the two retaining screws.
• Reconnect the lead to the main PCB.
• Reconnect the mains lead.
• Replace the power supply cover.
• Reconnect the power.
• Reconnect the Battery Backup Unit (If fitted)
Reference pin for pin 2
With respect to pin 1 output 49Volts +/- 2Volts
N/A
Reference pin for pin 6
N/A
With respect to pin 4 output 41.4Volts +/- 1.5Volts
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