Installation guide

SZ-DOC-W5-1.pdf LTU/NTU
Version: 1.5 Operating Manual
35 Revision: 2002-09-10
5Alarms
5.1 LEDs
The two LEDs ′Status Local′ and ′Status Remote′ are used to display normal operation condition
and alarm condition. Each LED can be green, amber, or red according to the following table.
On the Dual LTU, the LEDs are numbered from 1 to 4 and have the following functions:
LED Number System Local / Remote
1 1 Local
21Remote
3 2 Local
42Remote
Table 5-1: LED indication
5.1.1 Status LEDs
Status Local LED Remote LED
Power failure off off
Hardware / Software failure blinking red off
Normal operation (Master) green green
Normal operation (Slave) green off
Non-urgent alarms (local / remote) amber amber (off for Slave)
Urgent alarms (local / remote) red red (off for Slave)
Table 5-2: Alarm LED function