Alarm / Warning Contacts - ABB ETL600 Instruction Manual

ABB Switzerland Ltd
3.6.8.18.

Alarm / Warning Contacts

Following NSD600 alarms can be signaled individually per TPE on any
output of G4AI (it is noted that the alarm signals of only one TPE can
be signaled on the same G4AI – as it applies for the command signals
too):
•
G4AI alarm (hardware and TDM-bus problems; only the G4AI
module concerned does activate its alarm relay)
•
TPE link alarm (SNR and level alarm)
•
TPE hardware alarm (NSD600 related hardware problems on G4AI
and P4LT)
•
TPE alarm (summary alarm of NSD600 problems)
•
User Alarm 1 (settings identical to those of alarm relay 1 on R1BC)
•
User Alarm 2 (settings identical to those of alarm relay 2 on R1BC)
The NSD600 alarms "TPE hardware alarm", "TPE link alarm", TPE
interface alarm" and "TPE warning" can individually be signaled or can
be combined and signaled as TPE summary alarm on R1BC.
The alarm pick-up time and the alarm hold time can be set in the range
from 0.1 to 120 seconds. They are valid for all alarms in common
(PLC, Data, TPE). For the user alarms mentioned above, the pick-up
and hold times can be configured independently. Default setting for all
pick-up times: 10 seconds; default setting for all hold times: 1 second.
Note:
The relay contacts on G4AI are operated in the same way than the
alarm relays of the R1BC interface, i.e. the "alarm" condition is the
same as the "power off" state of the equipment (relay coil not
energized). On both modules the user can still choose – by using the
corresponding output contacts - whether the alarm contact shall be
"normally open" or "normally closed".
The solid-state outputs on G4AI are operated differently. An alarm
condition is signaled with a conducting (energized) FET. Therefore the
"alarm" condition is not the same as the "power off" state of the
equipment. For this reason it is recommended to configure alarm
signals on relay contacts only.
Both type of output contacts are activated only after the programmed
alarm delay time has elapsed. The same applies for the alarm hold
time. The LEDs of the outputs on G4AI correspond with the state of
the contacts, i.e. they also light up only if the alarm delay time has
elapsed and they will light on for the duration of the alarm hold time.
3-86
1KHW001489-EN
If a Tx or Rx command duration of > 10 seconds is
enabled, the alarm pick-up times for the link and user
alarms have to be configured correspondingly (refer
to Chapter 5 for details).
November 2005
ETL600
Structure and Function