A Din rail mounted current sensing relay dedicated for DC earth fault monitoring, such as insulation deterioration on a DC system. The unit is supplied complete with a dedicated DC Earth Fault CT type FOX21.CTD, this allows the relay to have two switchable earth fault ranges of 1-20mA and 10-200mA. The unit is fitted with four LED's to aid status diagnosis:-
Green LED = Auxiliary supply voltage healthy
Red LED = Output relay energised
Top Amber LED = Positive leg earth fault
Bottom Amber LED = Negative leg earth fault
Both Amber LED's = Open circuit or short circuit between CT & relay (also if Test function is used)
The amber earth fault LED's will start to illuminate at either 1mA or 10mA (depending on which range has been set), but the output relay will not de-energise until the setpoint has been reached, plus any delay “ON” time set, which is adjustable 0.1-10secs. The output relay is fail safe, ie energised when healthy, de-energises on earth fault.
After tripping on an earth fault and the fault level starts to fall below the setpoint it has to fall for a further 2% (hysteresis) plus any delay “OFF” time set before the output relay energises again. This is “AUTO RESET”. However, should the optional latch facility be utilised via a NC link between terminals Y1 & Y2 the NC link will need to be opened or the auxiliary supply removed to facilitate a reset, providing the fault is below the setpoint level plus hysteresis, “MANUAL RESET”.
The relay is also fitted with a relay Test input between terminals Y3 & Y4 via a NO input.
For correct operation when using the FOX.21CTD both the positive and negative conductors need to pass through the CT from P1 to P2 (load on P2 side), to ensure accurate amber LED indication. It is also possible to position the CT on just the earth leg in which case P2 is the Earth side, when used in this configuration on an earth fault, only the positive fault amber LED will illuminate. In both the above scenarios correct connection between the CT and relay with respect to terminals S1 & S2 is also important to ensure accurate indication.
85-370VDC / 85-265VAC
210-1200VDC (via separate DC to DC converter type YW1000D24D)
Power consumption: Max 3W
Earth Fault ranges: 1-20mA / 10-200mA switchable
Hysteresis: Fixed at 2% of set value (other values on request)
Tripping delay “ON”: Adjustable 0.1-10sec
Tripping delay “OFF”: Adjustable 0.1-10sec
Repeat accuracy: +2% at constant ambient
FOX.21CTD Internal dia: 21mm
Max distance between CT and relay:
(200 metre loop in total)
Recommended cable: 1.5mm tri rated
Operating temperature: -20°C to +65°C
Max power 2200VA, 30W DC
250VACDC @ 10 Amps AC1, 1 Amp DC1
Mechanical Life: 30 Million ops
Electrical life: 200K at 2200VA (resistive)
Max cable size: 4mm
CE marked: Yes
RoHS compliant: Yes
In accordance with:
Housing material: Polycarbonate, Auto extinguishable to UL 94 V-0
AUXILIARY SUPPLY OPTIONS
210-1200VDC (Via separate DC-DC converter type YW1000D24D)
FOX.21CTD Supplied with relay as a kit, (spare units are available separately)
The YWRI.DEF and its associated CT are designed to monitor insulation breakdown. It must not be used as a safeguard for life protection.
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