Connecting A Nominal -48/-60 Volt Negative Power Source - Cabletron Systems 9C214-2 Installation Manual

Connecting a Nominal -48/-60 Volt Negative Power Source

The nominal -48/-60 volt negative power source is connected to a 9C214-2 Power
Supply using at least number 10 AWG (5 square millimeters) copper wire to
which ring or spade terminals that will accept a number ten screw have been
attached. Connect the power source to the connections on the terminal block on
the 9C214-2 Power Supply (Figure 2-3) by following the steps below.
1. Interrupt power at the nominal -48/-60 volt power source.
2. Turn off the power supply circuit breaker.
3. Remove the cover protecting the terminal block.
4. Connect the earth ground lead to the earth ground terminal.
5. Connect the -48/-60 volt return lead to the positive terminal.
6. Connect the -48/-60 volt lead to the negative terminal.
7. Replace the cover on the terminal block.
8. Restore power to the -48/-60 volt power source.
9. Turn on the power supply circuit breaker.
If the input polarity detection buzzer sounds after turning on the power supply
NOTE circuit breaker, the connections are wrong. Turn off the power supply circuit
breaker, interrupt power at the nominal -48/-60 volt power source, disconnect the
power source and make the necessary changes to the existing connections.
Figure 2-3. Connecting a Nominal -48/-60 Volt Negative Power Source
Installing the 9C214-2 Power Supply
-48/-60 volt return lead
-48/-60 volt lead
earth ground lead
-48/-60 volt source
2-5