
6
300
%
Germany (0 91 87) 10-0 - USA (847) 827-7600 - UK (01296) 420336 - www.etacbe.com
Issue C
Technical description
Solid State Remote Power Controller E-1071-343
Storage time characteristic curve
Operating status
Fault-free
operation
Short-circuit Wire break
on the load
Control input
RED LED -
Control current
GREEN LED -
Load current monitoring
Auxiliary contact
Remarks
“0”
0
“1”
1
“1”
1
“0”
0
“1”
1
0
1
0
0
0
open open
load load
OFF ON
closed
open open
both load circuits
disconnected
Operating modes
1 - LED indicates
0 - LED does not indicate
t
(theoretical overcurrent factor)
I
N
2
10
100
5
3
1000
4
5 x I
N
current limitation
20
Under normal operating conditions, the E-T-A SSRPC E-1071-343 allows
the connection and disconnection of the load outputs of two channels
independent of each other.
Control circuits (I/II)
The control current flows through the LED and the opto coupler
immediately a voltage higher than 8.5 V is applied at the input terminals
(6 and 7, or 10 and 7). The opto coupler transmits the signal to the load
circuit, at the same time switching the load transistor on. This signal is
transmitted as a status signal to all monitoring circuits. The input
protection diode protects the control voltage from incorrect polarization.
Control current limitation is provided by a constant current diode.
Load circuits (I/II)
The load circuit is switched ON or OFF according to the control signal
(“0” or “1”), with electronic circuits monitoring the load circuit for faults
such as overload or short-circuit. Should one of these faults occur, the
monitoring circuitry will immediately react, causing the load transistor
to disconnect and the circuit breaker to trip. Transistor disconnection
occurs according to the storage time characteristics. The storage time
increases noise immunity avoiding disconnection of non-harmful peaks
such as those caused by inrush currents from lamp load connection.
Storage time is not a constant quantity but is inversely proportional to
the overcurrent factor.
After expiration of the storage time (see diagram) the load circuit transistor
will become non-conductive. After approx. 5 s the isolator will switch off
so as to disconnect the two load circuits. The common auxiliary contact
closes signalling the fault. After removal of the fault, the SSRPC can be
reactivated by pushing the isolator button.
Status outputs
Status indication is provided by 4 LEDs (2 x RED, 2 x GREEN).
RED LED
ON indication (I/II)
The red LED indicates when the control voltage is higher than 8.5 V, with
control current flowing.
GREEN LED
Current flow indication (I/II)
The green LED indicates when the load current is above 0.1 A.
Faults such as too high a resistance, wire break, poor contact, or
overload/short-circuit, are available when only the red LED indicates.
The SSRPC E-1071-343 includes three current measuring terminals (4
mm dia.) on the front. These terminals provide for load current
measurement in terms of voltage drop at the 0.1
shunt in the load
circuit (I/II).