CURRENT CONTROL RELAYS WITH INITIAL START UP DELAY & DELAY ON TRIPPING TIMERS

YWRI - Din rail current sensing relay, selectable via a wired link for either AC or DC current.

YWRI/I - Din rail “inverse” acting current sensing relay, selectable via a wired link for either AC or DC current.

YWRI.CT5 - Din rail current sensing relay, dedicated AC 5 Amp "CT" input version.

YWRI/I.CT5 - Din rail "inverse" acting current sensing relay, dedicated AC 5 Amp "CT" input version.

YWRI, YWRI.CT5

“Auto Reset” without latching mode. This mode is determined by terminals Y1 & Y2 left open. The output relay is energised when the monitored current rises above the selected set level, set via the front potentiometer. The output relay will de-energise when the current falls back below the level selected less the set hysteresis adjustable 5 to 50%, set via a second potentiometer. For example set level at 4 Amps, hysteresis at 30% will result in energisation at 4 Amps and de-energisation at 2.8 Amps. If the auxiliary supply is lost at any time the relay will also de-energise.

“Manual Reset” without latching mode. This mode is determined by a wired link between terminals Y1 & Y2. The output energises when the monitored current rises above the level selected via the front potentiometer. Once energised the relay will remain latched even if the monitored current falls below the set level less any selected hysteresis. Resetting is achieved by opening the link between terminals Y1 & Y2 or by removing the auxiliary supply. If whilst resetting the monitored current is still above the set level a reset will not be achieved. It is normally preferable in the latching mode to have the adjustable hysteresis set at minimum.

YWRI/I, YWRI/I.CT5

“Auto Reset” without latching. This version is only available as an “auto reset” device and the output relay acts in an “inverse” way, i.e. the output relay is normally energised and de-energises when the monitored current rises above the level selected via the front potentiometer. It will re-energise when the monitored current falls below the set level less the set hysteresis adjustable 5 to 50%, set via a second potentiometer. It should be noted that on first connection of the auxiliary supply the relay will energise for 0.1 secs (i.e. current below the set level), whilst the scanning circuit is determining the level of current being measured. This time can be extended up to 10 secs via the adjustable “start up delay” thus allowing a longer stabilisation period.

Adjustable Time Delays

The current relays have 3 independently adjustable 0.1-10 secs time delays. Initial start up delay timer, activated by the connection of the auxiliary supply, therefore if a control circuit is going to be permanently live this time delay will only ever be active once, a delay on rising current when the monitored current rises above the set level as selected by the front potentiometer and a delay on falling current, when the monitored current falls below the set level plus the hysteresis.

Selection of AC or DC Current

Din rail mounted units can be selected for either AC or DC current monitoring via a wired link between terminals B1 & lK.
B1 & IK linked = DC current.
B1 & IK open = AC current.

Use of Current Transformers

The three current ranges are determined by wiring to different terminals. For monitoring currents above 10 Amps AC a current transformer is required. On applications requiring a current transformer with a 5 Amp secondary use the YWRI.CT5 or YWRI/I.CT5 dedicated current transformer input units. A range of 1 Amp and 5 Amp secondary CT’s are available from our CT section.

DC Auxiliary Supply Versions

DC auxiliary supply versions are as standard non isolated. For these versions the supply and the measured current must be isolated from each other and must not exceed 50V DC. On request at extra cost isolated versions can be manufactured utilising internally a DC to DC converter.

Supply & Measuring:

Nominal supply tolerance: ±15%

Isolation AC versions: Via transformer

Isolation DC versions:
No as standard or
Yes via optional internal DC to DC converter

Power consumption: 3VA max

Hysteresis: Adjustable 5 to 50% of le

Repeat accuracy:
±2% at constant ambient
±5% across temperature range

Response time:
100 mSec on make
200 mSec on break

Input ranges selectable:
5-100mA (max overload 5A for less than 1 sec)
50mA-1A (max overload 17A for less than 1 sec)
0.5-10A (max overload 55A for less than 1 sec)

Input impedances:
100mA range 1 Ohm
1A range 0.1 Ohm
10A range 0.01 Ohm

Relay outputs:

Output contacts: SPCO 10Amps/250V AC1

Mechanical life: 30 Million ops

Electrical life: 200K ops at max rated load

General:

Operating temperature: -20°C to +65°C

Storage temperature: -20°C to +65°C

Max cable size: 4mm

CE marked: Yes

In accordance with:
EN61000-6-1: 2007
EN61000-6-3: 2007
EN61010-1: 2002

Housing material: Polycarbonate, Auto extinguishable to UL 94 V-0

TYPE

YWRI (Din rail AC or DC current)
YWRI/I (Din rail “inverse” AC or DC current)

COIL VOLTAGE

440VAC
415VAC
400VAC
380VAC
230VAC
110VAC
48VAC
24VAC
*48VDC
*24VDC

* No isolation on DC versions as standard, on request at extra cost isolated versions are available.

As an option the YWRI current control relay is available with a dedicated 5 Amp input designed to work in conjunction with any C.T. with a 5 Amp secondary. The YWRI.CT5 has the same mode of operation as the standard versions.

Supply & Measuring:

Input range: 0.25-5A (max overload 25A for less than 1 sec)

Input impedance: 0.022 Ohm

All other specification is the same as the standard YWRI.

TYPE

YWRI.CT5 (Din rail AC current)
YWRI/I.CT5 (Din rail“inverse”AC current)

COIL VOLTAGE

440VAC 415VAC 400VAC 380VAC 230VAC 110VAC 48VAC 24VAC *48VDC *24VDC

* No isolation on DC versions as standard, on request at extra cost isolated versions are available.