2. DS-620 (for EX-620)
The following procedures should be followed for connection of the
power supply unit. (Refer to illustrations.)
1. Turn off a power switch on the front panel.
2. Connect cables coming from the rear frame of the exchange to
the terminal board of the power supply unit, confirming the
colour of cables and the voltage specification marked on the
cables.
3. Take out the front panel by removing 6 screws and connect 3
Ni-Cd batteries to 3 battery connection cables.
4. Set the voltage selector in conformity with the source voltage
to be used.
5. Make connections for AC power supply and grounding.
6. Switch power on, and both the AC power and the battery cir-
cuits are activated.
7. Confirm the colour of Power indication lamp.
AC operation:
Green
Battery operation: Red
8. Check if the unit operates on battery without any problem
about 40 hours after power is switched on.
Fuse
Put the Power supply
unit into the bottom
part of the exchange
Use a proper type of fuse according to the number of the stations to
be connected. See the table below.
Number of Stations
0 - 3 0
31 ~ 64
65 ~ 128
Fuse Capacity
DC 5A
DC 8A
DC20A
Voltage selector
Power code
Power Supply Unit (DS-620)
(Rear view of the unit without the panel.)
Power switch
(AC/Battery)
Power Supply Unit (DS-620)
(Front view of the unit without the panel.)
Batteries NDC-2435 x 3 (24V 3.5Ah)
EX-620
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