
Chapter 2 Installation
Mechanical Installation
TC8518 Rev 2.2 User Manual
2-3
Determine if the front panel of PWR A and PWR B LED is green or ON.
If
Then
The LED is green on both power
A and B.
Proceed.
On
The front LED is OFF.
This indicates a problem with the power source, the
power supply or the connector. Please see
Off
2.4.2.1
Dry Contact Alarm Relay (DCAR)
A terminal block on the TC8518 provides for the dry contact relay alarm. This relay
may be used in conjunction with an external device to monitor the condition of the
TC8518. The rack mounted DCAR is located at the bottom of the TC8518.
Normally in the OPEN position, any alarm condition will trigger the switch to the
CLOSED position.
Normal Close
COM
Normal Open
Figure 2-1 TC8518 Dry Contact Alarm Relay