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This section provide the shutdown function when any of the following condition occurred;

i) Over voltage is detected on any of the outputs
ii) 15V output is shorted for a slightly extended period of time
iii) Over heating is detected on the secondary heatsink

TS101 : Secondary Heatsink over heat detecting thermostat
IC164 : 15V over current detecting IC
R208 : 15V current sensing resistor
ZD201 : 15V over voltage detecting zener diode
ZD301 : 15VP over voltage detecting zener diode
ZD501, ZD502 : 30V over voltage detecting zener diode
ZD103, ZD107 : 41V over voltage detecting zener diode
PC002 : transmit the abnormal detection to the Primary PWM to latch off.

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This section provides the charging function (AC operation) and Back up function (AC fail) to the power supply when an appropri-
ate battery is connected to CN604 and SW601 is switched to ON.

1. Charge Mode

When the AC is available and an appropriate battery (approximately more than 20V) is connected to CN604, the power supply 
will charge the battery at a constant current.
Q667 : Charge mode pass MOSFET
R604 : Charge current sensing resistor
Q663 : current control transistors
K601 : Relay off if the battery is lower than 20V to prevent overheating the pass element

2. Back up Mode

When the AC failed and an appropriate battery (approximately above 27.5V) is connected to CN604 and SW601 is switch to 
ON, the power supply will maintain regulated outputs (except 41V output which will drop in tandem with the battery voltage.)

 

K601 : Relay off if the battery is below the range (27.5 to 30.5V) to prevent over draining the battery.
D667 : Back up Mode Pass MOSFET
IC661, IC662 : Battery voltage detecting IC
F601 : Protection Fuse open during abnormal operation of battery.

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Accessory (included): screws x 4
User-supplied (not included): earthing wire. Back-up Battery Cable (KX-228 for PSU-M, or KX-A229 for PSU-L)

• For details about frame earth connection, refer to "Installation Manual".
• For details about backup batteries connection, refer to "Installation Manual".

Each PSU complies with Safety Class 1 of IEC60950, EN60950, UL60950, CAN/CSA-C22.2 No.60950, and AS/NZS60950; 
therefore a protective earth connection exists between the mains outlet ground and the PSU case. To ensure the PBX chassis is 
safely grounded, it is essential that the PSU case be securely fastened to the PBX chassis with the 4 screws provided with each 
PSU.
When installing or replacing PSU, basic safety precautions should always be followed to reduce the risk of fire, electric shock 
and injury to persons, including the following:

1. Never install or replace PSU during a lightning storm.
2. Never install or replace PSU in wet locations.
3. Never install or replace PSU unless the AC supply and backup battery supply are disconnected.
4. To protect the back board from static electricity, do not touch parts on the back board in the main unit and PSU. To discharge 

static, touch ground or wear an earthing strap.

PSU-M
(for KX-TDA100/200/600)

Lower: 100 V AC to 130 V AC

2.5 A

50 Hz or 60 Hz

Upper: 200 V AC to 240 V AC

1.4 A

PSU-L
(for KX-TDA200/600)

Lower: 100 V AC to 130 V AC

5.1 A

Upper: 200 V AC to 240 V AC

2.55 A

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1. Insert the PSU along the guide rails.

For safety reasons, do not touch parts in the PSU.

2. Push the release lever in the direction of the arrow, so that the PSU engages securely with the connector on the back board.

3. Turn the 4 screws clockwise, in the order indicated by the numbers 1 to 4, to fix the PSU.