Chapter 3 Hardware Overview
MES3500 Series User’s Guide
31
Keep the power supply switch and the Switch’s power switch in the OFF
position until you come to the procedure for turning on the power.
Use only power wires of the required diameter for connecting the Switch to a power supply.
3.1.4.1 AC Power Connection
Connect the female end of the power cord to the power socket of your Switch. Connect the other
end of the cord to a power outlet.
3.1.4.2 DC Power Connection
The Switch uses a single ETB series terminal block plug with four pins which allows you to connect
up to two separate power supplies. If one power supply fails the system can operate on the
remaining power supply. Use two wires to connect to a single terminal pair, one wire for the positive
terminal and one wire for the negative terminal.
Note: The current rating of the power wires must be greater than 20 Amps. The power
supply to which the Switch connects must have a built-in circuit breaker or switch
to toggle the power.
Note: When installing the power wire, push it wire firmly into the terminal as deep as
possible and make sure that no exposed (bare) wire can be seen or touched.
Exposed power wire is dangerous. Use extreme care when connecting a
DC power source to the device.
To connect a power supply:
1
Use a screwdriver to loosen the terminal block captive screws.
2
Connect one end of a power wire to the Switch’s
RTN
(return) pin and tighten the captive screw.
3
Connect the other end of the power wire to the positive terminal on the power supply.
4
Connect one end of a power wire to the Switch’s
-48V
(input) pin and tighten the captive screw.
5
Connect the other end of the power wire to the negative terminal on the power supply.
6
Insert the terminal block plug in the Switch’s terminal block header.
3.1.5 Signal Slot
The
Signal
slot (fitted with the signal connector) allows you to connect devices to the Switch, such
as sensors or other ZyXEL switches which support the external alarm feature. This feature is in
addition to the system alarm, which detects abnormal temperatures, and voltage levels on the
Switch.
Your Switch can respond to an external signal in four ways.
• The
ALM
LED shows an alert.
Summary of Contents for MES3500 Series
Page 16: ...Table of Contents MES3500 Series User s Guide 16 Appendix C Legal Information 357 Index 362...
Page 17: ...17 PART I User s Guide...
Page 72: ...72 PART II Technical Reference...
Page 178: ...Chapter 22 Policy Rule MES3500 Series User s Guide 178 Figure 98 Policy Example EXAMPLE...
Page 360: ...Appendix C Legal Information MES3500 Series User s Guide 360 Environmental Product Declaration...
