RMS 1S20, Руководство пользователя

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Due to RMS continuous product improvement policy this information is subject to change without notice. 1S30/Issue G/18/07/11 - 4/5
ARC FAULT PROTECTION SCHEME
Refer to the 1S20 Technical Bulletin for further details.
Type: 1S20K1 [C] Vx: 48V DC
Serial No: 126578
1S20 Arc Fault Monitor
ARC FAULT TRIP INITIATE
CB
ARC FAULT
MONITOR SENSOR
OVER-CURRENT RELAY
3 Pole OC + EF
RESET / TEST
System Functioning
Arc Fault Trip
System Service
DC Fail GREEN:
RED:
ORANGE:
DARK:
Figure 12:
Key components required to implement an Arc Fault Protection
scheme with an overcurrent check stage
to enhance system security
ARC PROTECTION SCHEME OPERATE TIME
The total time required for detection of the arc flash to closure of
the 1S20 Arc Fault Monitor trip contacts is less than 10ms
including bounce. Typical operate time is 7 to 8ms.
Figure 13:
CRO trace showing nominal operation time of the trip contacts at
7ms. First contact touch at 6.25ms and fully closed by 7.25ms.
Operation in <10ms is considered acceptable as current check
relay operate time is ~15ms.
MINIMUM ARC DURATION
The minimum arc “flash” duration required to guarantee operation
of the Arc Fault Monitors output contacts is 1.25ms.
AUXILIARY SUPPLY
Voltage from 1S20 Arc Fault Monitor: 12V DC
Power consumption: <2.5mA
CASING
Rugged moulded construction to IP51.
TEMPERATURE RANGE
Operating: -5 to +55
o
C
Storage: -25 to +75
o
C
Technical Data
SENSOR CONNECTIONS
The 1S30 is supplied with a 6m two core connection cable as
standard. Two core multi strand wire (2x16/0.2mm), is supplied
stripped & pre tinned at the 1S20 connection end. The standard
6m cable may be cut down to the desired length & crimp ring lugs
fitted for termination to the 1S20, 1S25 or 1S26 Arc Fault
Monitors.
The 1S30 connections are not polarity sensitive. Reversal of the
wires on the arc monitor terminals has no effect on the
performance of the 1S30 or arc detection system.
The cable is factory fitted to the 1S30 Arc Fault Sensor using a
stress relief molding to provide a sealed & durable connection
interface. The cable employs thick inner & outer insulation layers
to avoid damage during installation.
For connection over longer distances shielded cable is
recommended. For distances over 20m, 24/0.2 mm cable should
be employed.
ADDITIONAL 1S30 CABLE LENGTH
Screened arc sensor cables may be increased by wiring
additional series twisted pair SCREENED cable
provided it does
not exceed 5 ohms and 30nF loop impedance.
ARC SENSOR SHIELD WIRE EARTH CONNECTION
The arc sensor shield wire(s) should be connected to ground as
detailed in figures 14 to 16.
Figure 14: 1S20 DIN rail mount earth connection detail
Figure 15: 1S20 panel mount earth connection detail
Figure 16: M Series case type earth connection detail
DIRECT MOUNTED EARTH
(EK10/35)
TERMINAL