Relay Outputs - ABB ETL600 Instruction Manual

ETL600
external contact. The protection relay should provide potential–free
contacts for this purpose.
The input circuits are current limited, no external precautions have to
be taken.
Each input can be programmed with the help of the user interface
HMI600 for one of the many foreseen functions, e.g.:
•
Input 1: Command A
•
Input 2: Command C
•
Input 3: Command D
•
Input 4: Start input
The input signals are transferred to the RF converter type P4LT via the
TDM bus. The signal processor on the G4AI module can detect
component failures and thus prevents malfunctioning of the
equipment. Such failures are indicated by the alarm LED provided on
the module frontplate and are also passed on to the P4LT module.
3.3.2.3. Solid state outputs
The signals to activate the solid state outputs arrive from the TDM-bus.
The DSP on G4AI checks these signals and when convinced about the
validity, activates the assigned solid state contact(s).
In case of over-current duration for more than 6 ms (due to short circuit
or large capacitive load), the output is blocked for about 0.75 s. After
that, the output circuit is switched on again. This procedure is repeated
and a module alarm is generated as long as the external over-current
condition or short-circuit exists. The solid state outputs can therefore
be considered as short circuit proof.
If the equipment is not powered, the solid state output switches are
open.
Each output can be programmed with the help of the user interface
HMI600 for one of the many foreseen functions, e.g.:
•
Output 1: Command A
•
Output 2: Command D
•
Output 3: Unblocking
•
Output 4: TPE1 link alarm
3.3.2.4.

Relay outputs

The signal processing for the relay outputs is treated the same way as
in case of the solid state outputs.
The operating contact (Normally Open - NO or Normally Closed - NC)
of each relay can be selected by a corresponding jumper.
Each relay can be programmed with the help of the user interface
HMI600 for one of the many foreseen functions, e.g.:
•
Relay 1: Command A
•
Relay 2: TPE1 alarm
Structure and Function
1KHW001489-EN
November 2005
ABB Switzerland Ltd
3-21