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Replacing the Alarm Relay Wires from the MX2020 Craft Interface

 

Disconnecting the Alarm Relay Wires from the MX2020 Craft Interface

To disconnect the alarm relay wires from the router and an alarm-reporting device (see Figure 1):

  1. Disconnect the existing wire at the external device.
  2. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
  3. Using a 2.5 mm flat-blade screwdriver, loosen the small screws on the face of the terminal block and remove the block from the relay contact.
  4. Using the 2.5 mm flat-blade screwdriver, loosen the small screws on the side of the terminal block. Remove existing wires from the slots in the front of the block (see Table 1).
Figure 1: Alarm Relay Contacts
Alarm Relay Contacts

Table 1: Alarm Relay Contacts on the Craft Interface

Function No.

Label

Description

1

MINOR ALARM—[NC C NO]

MAJOR ALARM—[NC C NO]

The alarm relays consist of three terminal contacts with a normal closed (NC), common (C), and normal open (NO) relays that signal a minor or major alarm when broken.

Connecting the Alarm Relay Wires to the MX2020 Craft Interface

To connect the alarm relay wires between a router and an alarm-reporting device (see Figure 2):

  1. Prepare the required length of replacement wire with gauge between 28 AWG and 14 AWG (0.08 and 2.08 mm2).
  2. Insert the replacement wires into the slots in the front of the block (see Table 2). Use a 2.5 mm flat-blade screwdriver to tighten the screws and secure the wire.
  3. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
  4. Plug the terminal block into the relay contact, and use a 2.5 mm flat-blade screwdriver to tighten the screws on the face of the block.
  5. Attach the other end of the wires to the external device.
Figure 2: Alarm Relay Contacts
Alarm Relay Contacts

Table 2: Connecting Alarm Relay Contacts

Function No.

Label

Description

1

MINOR ALARM—[NC C NO]

MAJOR ALARM—[NC C NO]

The alarm relays consist of three terminal contacts with a normal closed (NC), common (C), and normal open (NO) relays that signal a minor or major alarm when broken.