TOSHIBA

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RC820 (2E RELAY) INSTRUCTION MANUAL

RELAY MODELS RC820-HP-YRC820-AP-Y

AUXILIARY MODULES RC-81A (GROUND FAULT) RC-81 B (PHASE REVERSAL) RC-81C (GROUND FAULT/PHASE REVERSAL)

TOSHIBA CORPORATION

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C 0 M T E N T S Page OUTJ,INI: ____---_--_________--------------------------_--------------_----------__-_________________--------------------------------------------------------_-----2 2 2 3 7 I. 0 13 16 17 19 20 22 24

INITIAL IMSPECTION APPLICATIONS

RATINGS AND PERFORXAPJCZS PRECAUTIONS IN APPLICATIONS INSTALLATION

---_---_-_____-______________________ ----------_---_--_--________

CIRCUIT CONSTRUCTIONS IIOM TO SET SELIKTION

---------_-----_-_-_------------------AND ADJUSTEIENTS -_-_----_-______________ -----------------------

INSPECTION AND MAINTEI4ANCE TROUBLE-SHOOTING

-______________-_________________ ------------------------------------------------

INSTALLATION TEST PROCEDURE GROIJND FAULT TEST FORM

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OUTLINE

The 2E Relay (static relay for three-phase induction motors) is widely used in various industrial fields to protect induction motors against overloads and other abnormal conditions (i.e., single phase, unbalanced phases). Optional plug-in type modules can be installed which include the RCRlA ground fault module, RCRlB phase reversal module, and RCRlC ground fault/phase reversal module.

INITIAL INSPECTION

(1)

Check that the 2E Relay and/or additional module is per ordering specifications.

(2)

Check

the 21: Relay and/or additional module for damage

incurred during shipment (breakage, loose parts).

APPLICATIONS

The 2'3 Relay and/or additional module is used to protect three phase induction motors and other three-phase loads, not only from ovcrloa~ds and single phase conditions phase reversal an83 ground fault. but also from

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RATINGS Table :. Table 1 \

AND

PERFORMANCES

ists the ratings and performance of the 21? Relay. Ratings al nc 1 Performances of the 2E Relay ..___.. RI, 82?-- ._. --;gl* 1 ;FE;12 1 Kzi12m
-.-~--_

...u,. T y p e - F o r m

Items

-'\

Applicable ckcuit
-.

Wee-phase circuits rated up to 600V AC, 50/60 HZ - Direct (Also, applicable to high-voltage circuit: by cc&in&q with high-voltage CTS) Dual functions (2E relay) ---- Over load acd Single phase protection. 7AT mmG;-

Protective functions
Rat&l ampere-

Rated current -

turns Setting range Ultimate operating current Operating time setting range Operating time accuracy

%~150% of rated at-[75+(5+1(l+20+40)%1 105*125% of current setting 3s40 Sec. for starting characteristics at 600% of current setting [3+(2+5+10+20) sec.1 +20% of tine setting 85% of current setting under one-phase ccmpletely loss state (When measured on either remaining phase.) -- See Fig. 1 --___--.-Less than

Gverload operating characteristics

Single-phase protection 3perating zharacteristics Iontrol voltage

Minimum operating current operating time Rating Tolerance

4 sec.

10@~12OV/200+240 V AC, lrd , SO/60 HZ 85% s 110%

<z ?

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RC 8 2 0 -

L.. \ Type -Form

T HP~Y HPZY12 AP2Y 2

VA

Power consmlption

circuit __Detecting circuit

0.3 VA/phase at rateJ current

contact Output arrangement ___contact Contxt specifications : capacity NEMA B300

1x0 - NC 12OV AC-5.OA 12OV AC-3.OA 125V IX!-0.2A 250V DC-O.lA LED

(SPDT/FOIIII C)

(Resistive load) (Inductive load, pf=0.40) (iJR=7ms) (IdR=7ms)

Fault in&cation Reset r,ode

RCP?O --H PElY --. Mdnunl R&et T y p e RCH20-HP! ,Y12 Man~algRemote Reset Jr;82G--A~!~~<.~: A u t o Reset..T&_e _...___

Application conditions

Ambient temp:rature Relative hwnidity

- 1 0 ?I +GOOC

4 5 Q, 8 5 % a t 2 0 C

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The a'dditional modules are connected to the 2E relay with gold plated pins and their principal ratings are the same as that of 2E Relay. range and parformances. Table 2 Ratings and Performances of optional modules RC8lA \ K81l3 RC81C In Table 2 is listed its ratings

l-._ _ T&e-Form
Items Operating Phase current reversal Operating zharacteristics time

90% of 2K relay 90% of 2E relay current setting current set&y

Grouncl fault 411 s l?A current zcr setting Primary Maximum fault current tiround fault time settitq htput signal -~~~ rrip indication -______-.

o.ls~l.os

l\ ~~ \

o.ls~l.os

output contacts of basic relay

<CT

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Overload operating characteristics Ultimate operating current --- 105-125 of current setting Single phase protection operating characteristics min. operating current --- 85% of current setting

., .I~./,

..,-.

+...

.,.+~

.___

,l,nl---C~Ilii~.-Overload operatingL-./,-characteristics-

'?I-Single

NUT,TIPLCS

OF LOAD CURRENT

MULTIPLES OF LOAD CURRENT RUNNING CliARAC'TEHISTIC

STARTING CIIARACTCRISTIC

Fi.g .

3.

Operating

characteristic

curve

-. 0 ?i 6 6 -

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PR E C A U T I O N S

IN

A PP L I C A T I O N S

When planning to use Toshiba Static 2E Relays, be sure to give full consideration to the following precautions: (1) (Control power source supply The power circuit must be arranged so that control Ipower is always supplied to the 2E Relay before the main circuit is switched ON. (2) Limit the secondary burden when combining with external cT's. When the relay is used in a medium an excessive CT secondary

or high voltage circuit,

burden may cause secondary current waveform distortion. !;ince large waveform distortion may be detected as unbalanced current, limit the external CT secondary burden according to the overcurrent constant while referring to Table 3. Table 3

Limit of external CT secondary burden Recommended Secondary Burden Not greater than 50% of rating Not greater than 85% of rating

l(l or above

Up to rated burden

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(3) Application on DC systems See Fig. 2. In DC control systems main current does not flow sinusoidaly even though the power system (voltage) may be AC, so the 2E Relay, and/or modules, are not applicable. additional

Three-phase AC power supply

2E CT 2E Relay
-

Thyristor

23
DCM

?-

DC Motor

Fig. 2 Example of misapplication of the 2E Relay

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(4) The 2E Relay has phase unbalance detecting characteristics. Figure 4 shows how the current's unbal-

anced trip point depends upon the relay's current setting and the unbalanced current rate.

Current setting value:iOo%

Current setting value:150%

I max.:

Max.

phase cUrrent

0 0 :100
200 300 400 500 600 700 800

-Max. phase current (percent of current setting)

Fig. 3 Phase unbalance detecting characteristics

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INSTALLATION 1. Surface Mounting -

The 2E relay will be shipped with mounting feet loose. Before installation, attach the mounting feet to the The below shown mounting feet relay as shown Fig. 4. and hardware will be shipped together with the relay as standard accessory. Do not use a screw-locking agent when tightening.

Mounting

Feet

AcceSSOry

5CO.20)

Dia-4

Mounting
M3.5

ScrfwS \

setting Switches Time Setting

Fig. 4 Surface mount type 2E Relay

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2.'

Flush Mountins For is flush mounting, flush mounting kit (order separately)

required. installation, attach the flush mounting fee to the instead of surface mounting feet as shown Fig.5.

Before relay

Flush Parts

Mounting

Kit

I
Feet Nylatch I

Quantity 2 1 4 I

Flush Flush M4 M4

Mounting Cover

with

Screws Spring Washers

Mountiny

Panel Terminal

8(0.32)Dia

-2 Mounting EaO(2.36)

Holes Conductor

kp-4

Nylatch

j 170(2'.75)_jj,' .47+0.2) .66+0.2) -

5(0.2)Dia
1 . 6 M i n L 3 . 2 M a x ( 0 . 0 6 m i n 2, 0 . 1 2 5 max)

-4 Mounting Holes

Fig. 5 Flush mount type 2E

Relay

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3.

Optional Install module) For:

Module module as

Installation with two knurl after screws the (accessory of

shown

Fig. 6

relay

installation

and wiring to the relay are completed. module to installation, peel off the side label on open the holes for connection pins.
the relay

4.8(0.1?) Dia-2 Kounting Holes -

Fin Contacts ,
Indicator

+--11.1 -.
z
Fig. 6A

-+--

Mounting -

i6OC2.36) P.20 i

1 lsl cl:Y8, 1 (0.59)

Additional

m'2dul.e

Fig. 68

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Combination of 2l? relay and additional module

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CIRCUIT When Fig. 1) 2) 3) wiring primary

CONSTRUCTIONS wires through the CT windows, see

9, take care of the following: Primary Primary Primary wires must wires wires must must go go through through the the in same correct the same CT windows.

direction. turns through

have

number of

the CT windows. Before low voltage applying induction the the 2E Relay and/or additional Fig. 8, module which for

motor

protection,

see

illustrates

typical

wiring

connections. low voltage

Applying the 2E Relay for high voltage,or large

capacity the CT

systems,

see

Fig.

9.

It is necessary to is,
CT

balance length.

secondary

load,

that

secondary

wire

Built-in CT window

l pqqgJ-e Nwnker of turns 1

Vumber

of turns2

3 passes

-:= -.T e
2 PCs5

Number of turns 3 wires

Fig.

Installation built-in

of

passing

through

the

CT's

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Low-voltage pows!r supply 200V 21 240V AC

In case of low-voltage circuits (rated at 600V or less) Applied circuit wire is directly passed through the built-in CT window. CAUTION: * Connections of control power source AC 100-120V --- Terminals l-2 AC 200-240V --- Terminals l-3 ** Connections of output contacts NC-contact (opened when the 2E Relay operated) --- Terminals 8-9 NO-contact (closed when the 2E Relay operated) --- Terminals 9-10 *** Connections of Remote reset switch Remote reset --- Terminals 4-5 /P ,'Special spec.: RC820- tl P CIY I 2\\
/ Viiriny lenqth,from 2F tn r e s e t SwitLh \ mu>t he 1w.s than :m. i

Tow-voltage induction motor

i.jy.

~~~~~~~~~

~pplicatloll

i.r low-vnlrdg~ - 1 4 -

i n d u c t i o n motor circuit

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Kigh-voltage power supp1;, 2.3KV % 13.8KV nc

PT Or Control transformer (2.3KV/12OV or 13.8KV,'120V)

I r ___-

stop

iigh-voltage :ontactor
A

+.;i
-

contaqm owatl~ co11

Jt-start

M
+

High voltage CT

High-voltage induction :ootor

High-voltage CT secondary circuit wires pass through the windows of the built-in CT's.

Fig. 9 Typical application to high-voltage induction motor circuit with ground fault protection

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IIOW TO SET

The 213

relay is offered in three models, Ampere-Turn 7AT 55AT 1lOAT Rating

Model RC820-F:PlY RCDi.O-iiP2Y RC820-;.:P3Y

with each having ?.n adjustable (Ampere-Turn) range of 75%150%. Each model has direct wiring capability through the three current transformer's ). windows. This is limited to 165 amperes

(X820-r!P3Y \ ..

For larger currents, or voltages above 6OOV,

the use of extern;J current transformers is required. Selection of the suitable model may require some preliminary calculations. See "Current Setting Adjustments" to -.

determine if the calculated "% Dial Setting" can be obtained with the selected model given the motor's full load current (FLA).
limiting

Model Selection can also be influenced by wire

Size

the number of turns that can be passed through the

CT windows (0.75 in. by 0.75 in.).

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SELECTION

AND

ADJUSTMENTS

(1) Current Setting Adjustment N(T)=2E Amp-Turn -~iotor-F~~ -.--. ~- Ratio* Rating x External CT

N(T)

: Number of turns through the 2E's built-in CT's, rounded off to nearest integer (CT wraps are additive).

Current Setting % .Z Motor FLA x N(T) ~100% 2E Amp-Turn RAz-xE<ternai CT Ratio* CT Ratio: Ex. 500A/5A CT's = 1OO:l

Exts!rnal

If no external CT's are used, substitute with "1.0". ** For 1.15 Service Factor Motors. If the motor has a 1.0 S.

F., multiply the calculated Current Setting %" by 0.93.

NOTE :

Select the external CT'S ratio so that the current setting 8 is as close to 100% as possible.

Example Ul:

5OHP, 4GOV 65A Full Load, 1.15 S.F. Across-the-line start. Since the full load falls within the range of the 55 AT (75 - 150%) 2E Relay's CT's, and no external CT's are required, The 8 Dial Setting _ 65~1~100% = 118% = 115% or 120% 55

Example X2:

2OOHP, 46OV, 240A Full Load, 1.15 S.F. Across-the-line start. 240 Amps exceeds the highest rated 2E Relay, therefore, external CT's must be used, and the HPlY , 7 AT rated 2E, will be chosen as the standard model when the current exceeds the HP3Y 's rating. If 300/5 CT's are used,

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the Current Setting 8 = 240 x N(T) x 100% 7 x (300) 5 = N(T) x 57.14%. And if 2 turns through the 2E Relay's CT windows (from the external CT'S) are used, the 8 Dial Setting = 2 x 57.14 = 114% = 110% or 115% (2) Time setting Determine the protection curve from 2E Relay operating curves shown in Fig. 1, and read the operating time at 'Adjust the time setting dip

GOO% of setting current.

switch to the nearest setting above the operating time. When using the RC81A or RC81C with the 2E Relay, determine the settings with the same manner mentioned above. (3) Fault Indication and Reset The LED on the 2E relay is illuminated by any trip condition. The optional module's have individual indicators (LED's). When the 2E Relay detects an overload, single phase or phase unbalance condition, and the LED indicator lights, When the

throw the reset toggle switch to reset the relay.

2E relay equiped with an optional module detects a phase reversal or ground fault n>f!t- the t.G,Jqle swi !( /I of the 2E relay and optional module to turn off both LED'S.

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INSPECTION

AND

MAINTENANCE

Before inspection and maintenance, read the following items to determine the maintenance period.

Intervals

of

inspection

(1) When the 2E Relay and/or additional module in an ordinary electric control room is operated under relatively good environmental conditions . . . . . Approx. annually (2) When the 2E Relay and/or additional module is operated under adverse environmental conditions . . . . . Approx. semi-annually Items to be inspected (1) Dust accumulation . . . . . When dust accumulation or contami-

nation is observed near the current-conducting components, wipe them clean with a soft, dry cloth. gasol.ine, (2) Loose Do NOT use

bengine, or other organic solvents.

stress

(3) Presel: points of the current-setting and time-setting switches (4) Operation of the test switch, if necessary (5) Operating characteristics, if necessary
(6)

Damage or other defects

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TROUBLE-SHOOTING 1n case of trouble, determine the cause of the trouble in accordance with the sequence shown in Fig. 10 or Fig. 11. After clarifying the cause, chart to correct the problem.
2~

take the actions shown in the

nelay fails to operate I

Iil~~~i~~~~~F:..:I.;.;...I.. 4
Check the sequence of primary wires Incorrect Correct it 1

set

current
normally

Operates

Fig. 10 Trouble-shooting table ('#hen 2E Relay fails to operate)

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2E Relay trips during motor start-up and operation

Check the phase sequence Check the motor and load to eliminate

Abnormal Ch

Operates normally (See Fig. 1)

current

value

Fig. 11 Trouble-shooting table

(When 2E Relay operates during motor start-up and operating)

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-1:NSTALLATION TEST PROCEDURE

It is not necessary to schedule periodic maintenance and testing of the ground fault protection. However, if tests

are desired to confirm the proper operation of the system, one of the following procedures can be used.

Iri--

1. Mounted in corltrol panel Power _~---__-------------------r--------

~;~~~lc~-~--:l,:;ll,+ Y L ___________ --------------_------------ -------- Fig. 12 Test circuit Note. The above figure shows the relay reset. (not tripped). The resistor in the test unit is for currtnt llr~:~?in~j. 1. 2. 3. 4. 5. 6. 7.

--j

When testing the ground fault module, keep the main circuit de-energized. Set the ground current knob at a proper value of IGS. (ground fault trip point) Connect the test wire through the ZCT window as show in Fig. 12. Apply control power to the 2E and interrupting device. Apply 1.25xIGS with the test circuit and interrupt the current when the relay operates. Check the operation of the relay with test switch on the 2E and check that the LED indicator lights. If the relay does not operate at the set time, interrupt the test current., cheek the current setting and the repeat test.
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2.

Bc?nch

Test

r-------------------I

, - - - -----------t---t

I I I

M
GROUND CURRENT- DELAY DETECT

OUTPUT

;RCDlA or RCBlC L-_----------------------------J

2-l i-u
Pl I+ I

I
POk TER PLY t

P2 s"p

Fig.

13

Test

circuit

Note. The above figure The resistor in 1. 2. 3. 4. 5.

shows the relay reset.(not tripped). the test unit is for current limiting.

Connect the sensor and relay as shown in FIG. 13. Set the ground current knob at a proper value of IGS (ground fault trip point). Apply 1.25xIGS with the test circuit and interrupt the current when the relay operates. Check the operation of the relay with the test switch on the 2E and check that the LED indicator lights. If relay does not operate at the settilm,interrul>t ,hc: es-l: current, check the culrbnt sett.iny nt\~ repeat ihe th<(;.

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- Gl'?-;-

P..UL:

--.- ---.. T:...: F...:..

vo. --

Date

Setting -

Test current

Result

Not .e

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