Alarm Contacts; Owered U Nits - GE Multilink ML3000 Instruction Manual

INSTALLATION
3.4.2 UL/CE Requirements for DC-Powered Units
3.4.3

Alarm Contacts

3–8
1. Minimum 18 AWG cable for connection to a centralized DC power source.
2. Minimum 14 AWG cable for connection to a earthing wiring.
3. Use only with listed 10 A circuit breaker provided in building installation, and a
20 A (maximum) branch protection for units rated 90 to 265 V.
4. "Complies with FDA radiation performance standards, 21 CFR sub-chapter J"
or equivalent.
5. Fastening torque of the lugs on the terminal block: 9 inch-pound maximum.
6. For AC and HI powered units, use only with listed 20A circuit breaker provided
in building installation. Circuit breaker shall be provided in end system or
building as disconnect device.
7. Disconnect all power sources before servicing. Take special precautions if
servicing a dual power supply unit.
8. Only CE marked external power supplies must be used on the DC-powered
unit.
9. Centralized DC power source cable securing; use at least four cable ties to
secure the cable to the rack at least 4 inches apart, with the first one located
within 6 inches of the terminal block.
The alarm contacts feature, standard on the ML3000 ethernet switch, provides two form-C
normally closed (NC) contacts to which the user can attach two sets of status monitoring
wires at the alarms terminal block, see Fig 3.4.1a above or Fig 3.5a below.
The first NC alarm contact is a "software alarm" (labeled S/W), operated by user settings in
the ML3000 software. The user can disable the software alarm feature with a software
configuration command if desired. When the software alarm is enabled, the form-C
normally closed (NC) contact is held close during normal software operation. A user-
defined software malfunction, such as an SNMP trap or a software security violation or an
RSTP Fault, causes the contact to open and thus trigger an alarm in the user's monitoring
system.
The second NC alarm contact is held closed when there is power on the main board inside
of the ML3000. This provides a "hardware alarm" (labeled H/W) because the NC contacts
will open when internal power is lost, either from an external power down condition or by
the failure of the power supply inside of the ML3000.
Useful information about the alarm contacts:
1. There is one four-pin terminal block (pins 1,2,3,4) provided next to the power input.
2. The left two pins (1,2) are hardware operated
3. The right two pins (3,4) are software operated
4. These are both NC (normally closed) relays
5. The switch's software operation needs to be enabled and set to get the Alarm traps.
For detailed information about the Software Alarm and software control of SNMP
alarm traps, please reference the User Manual.
MULTILINK ML3000 ETHERNET COMMUNICATIONS SWITCH – INSTRUCTION MANUAL
CHAPTER 3: INSTALLATION