Toshiba Current Relay RC803A-HP1 User manual

TOSHIBA
I NSTRUCTI ON MANUAL
CURRENT RELAY
RC803A-HP1
TOSHIEA CORPORATION

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TOSHIBA
6F9E0090
CONTENTS
1. General
Descrigtion
__-----_-__----____---------------------
2
2. Check Before Using
-__-----__-_---_-_______________________-
2
2.1 External
Amearance
-_-_-_---_-__-__-_----------------
2
2.2 Specifications
_--_---_-__-__--_-__-------------------
3
3. DescriDtion of ODeration__-______-_______-__--------------- 5
4.
Applications __-______-_________----------------------------
6
4.1 Overcurrent Detection on Hotors ----------------------- 6
4.2 Undercurrent Detection on Motors ---------------------- 0
b.3 Limiting Starting Current of Rotors -------------------
9 .
4.4 Transformers
-__----__-__-___-___----------------------
10
4.5 Heaters, Laape and Other Circuits --------------------- 10
5.
Mounting ---____----___-_-_-_____________________----------- 10
6. Adjustaents ----------
--__-_----______---___________________
12
6.1
Current Setting ____-----_-_____-______________________
12
6.2 Setting the Detection Delay Tiae ---------------------- 12
6.3 Setting the Response Delay
Tiae ----------------------- 13
7. Ogerat ional lest
____--_____--___________________________---
13
8. Cover
Reaoval
_-_-m-mm----____-__-__-__--___-_______________ 17
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6F9E0090
Please thoroughly read this instruction manual before using the
RC803A Current SensinD Relay.
1. General DescriDtion
This current relay is designed to detect current in AC circuits
with a wide range of aDDiications, e.t., detection of abnoraai
current of VariOUS electrical eauiment due to overloads or broken
circuits (e.g., heater circuits), detection of starting current to
autoaaticaiiy advance the secondary resistance on induction wound
rotor motor controllers.
During starting, excessive current such as inrush current, lay
exceed rated current flow in motor or transforaer circuits. this
current relay has an adjustable delay circuit to prevent it fro&
operating during start-up.
Further, this current relay is fail safe. The relay ooerates
at the saae tile control Dower is applied. and the relay is de-
energized when the inout signal exceeds the Dreset level or control
Dower is removed.
2. Check Before Using
Before using this relay. check the following Doints. If any
defects are found, contact the dealer free which you purchased this
relay.
2.1 External Aopearance
Check the relay for any missing Darts and for damage, dirt,
rust, and loosened screi6 caused during transportation.
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2.2 Specifications
_____________-_-________________________------------------------------
ITEH
Rated Current
Range of current
sensing
Inout circuit
voltage
Type of Current
ReSDOnSe delay
time-adjustable
range
Detection delay
tile-adjustable
range
Operating volt.
SPECIFICATIDHS
5A (continuous)
0.5 - 5A (For current above this range, use a
CT (current transforrer) and connect the
relay to its secondary side).
> low voltage circuit (below AC 6OOV)
3 To detect current in high voltage circuits,
use a CT, and connect the relay to its
secondary side.
Overcurrent, Undercurrent
0.1
- 3s
0.1 - 30s
a5 -
132VAC. 170 -
250VAC, 50/6Diiz
i
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ITEH
Ambient temp.
range
Temp. error
Dielectric with-
stand voltage
Imgulse with-
stand voltage
Insulation
resistance
Vibration
-Oscillation
-1aoulse
Overcurrent
intensity
Output contact
rating
(250VAC aax. I
SPECIFICATIORS
-10 - *SO%
+10X at t30Y
Between terminals and ground
2DOOVAC for 1 #in.
Between terminals and ground
1 X 40)~s at 45OOV (standard waveform)
Between terminals and ground 1DOH Ohm or
more when measured with a SDOVDC aegger.
Amplitude 2.5~ - 20Hz (26)
156
40 times of max. continuous current (SAI,
for 1 sec.,
agglied twice, in accordance with
JEC 174.
Over Current: SPDT
Under Current; SPDT
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TOSHIBA
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WEHA AC
Rating
Designation
B300
Inductive load
t-K&-
120
AC
240
24
DC 120
240
ITEH SPECIFICATIONS
Hysteresis AgDrox. 10X of ooerating value.
Power consumption oDperating Power 3.5VA
olnput Circuit D.lVA (when 5A is applied)
Height .75kg (1.7 lb)
I
Break Continuous
5A SA
(p.f.-0.4)
3A SA
_--_________________-----------------.
0.3A !iA
O.l!iA (L/R=15ms) 5A
O.lA 5A
3. DescriDtion of Ooeration
When the detected current exceeds the detection circuit
operating level, the detection delay timer is actuated. If over-
current is continuously detected for more then the detection delay
time set value, the overcurrent response delay timer is actuated.
Then, if overcurrent is detected when the resDonse delay timer has
elapsed, the overcurrent relay is actuated.
If current drops below the undercurrent detection set ValUe,
the resgonse delay timer is actuated, and after the set tile has
exoired, the undercurrent detection relay is actuated. In the case
of undercurrent detection, the detection delay timer is not actuated.
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6F9E0090
Detection delay
.I .pL1
mrellt
4
0
level (0.3-O.b5A)
\
Undercurrent detect img
FiD. 1 Characteristics
1. APDl ication
4.1 Overcurrent Detection on Hotors
An aDDlication example Is shown in Fig. 2. In this clrcult.
an excessive load is detected by detecting the overcurrent of a
motor and the lain circuit is ooend to Protect
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the uotor from being damaged. If the detected current is above
!iA. and in case of a high voltage circuit, use an external CT and
connect the secondary side of CT to the relay as shown in the
following figure:
AC3-Phase Power SuDDly
Ll
Y
23 1
I A I
#
I1
‘I
=
Current relay
Note: The RCB03’s OUtDUt
contacts are shown
with Dower source
aDDl ied.
TiD. 2 ADDlication ExaaDle using An External CT

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TOSHIBA
6F9E0090
further, when this relay is used in a uotor circuit, the
detection delay timer should be set lonfler than the startinv
time (about 120%) so that this relay is not actuated by inrush
current. If current flowinp in the
uain circuit becomes abnormal
after the tiee Deriod of the detection delay timer has elapsed.
the relay is actuated when the set tiue of the response delay
tiler is over.
4.2 Undercurrent Detection on Hotors
To utilize the undercurrent detection function, the relay
is used in a notor circuit with a fixed load, to detect livht
or no load conditions. For
examDIe. in the case of a DUUD UOtOr,
this relay is used to detect undercurrent when the VOlUue Of
water SUDDlied in a water Dipe is low, or in case of a thread
winding rachine, when the tension of the thread droes.

TOSHIBA
6F9EOO90
ACJ-Phase Power SUDDIY
Current relay
Note: The RC803’s outDut
contacts are shown
with Dower source
aDDl ied.
Fig. 3 Application Example
4.3 Limiting Startino current of Rotors
Many eotors of uediua and large capacity use a aethod to
start by limiting starting current. 8y detectino the lain
circuit current, this relay can automatically advance the
starting resistance on the secondary side of the motor (in this
case, the knob of the detection delay timar and that of the
resoonse delay timer should be kept at the minimum settings).
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4.4 Transformers
To use this current relay for detecting overcurrent on
transformers. it is necessary to set the detection delay tiler
with the inrush current of transforeer taken into consideration.
4.5 Heaters, LauDs and other Circuits
This relay can be used to detect the disconnection of
circuits by sensing the existence of current flow. In other
words, if disconnection occurs, current does not flow and an
undercurrent condition is detected by the relay. For
exaeDle.
this relay can be used to detect the disconnection of heater
circuits on constant temperature ovens or heatar circuits for
insulators on transmission and distribution facilities In
extremely cold regions.
5. Hount ing
See Fig. 4 for uounting dieensions. Be careful not to use this
relay in the following conditions:
(1) Locations in aebient teeperatures outside -10 - +SO”C.
(2) Locations subject to high teeDeratUre, steal or dripping water,
(3) Dusty/dirty locations,
(4) LOCatiOnS subject to vibration (total amplitude 2.5~ or eore,
20 tiles/m. or aore) and shock (above 156 in 3 directions).
4
8
z
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6F9E0090
50
3-$7 Hole
7
z
Hountino holes
Fig. 4 Dimensions
B
!3
t.
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6. AdjustDents
6.1 Current setting
(1) When detected current is in a range of 0.5 - 5A:
After confirming that the current value under noraal load
condition is in a range of 0.5 - SA, set the current
adjusting knob to the desired detecting value.
(2) When detected current is above 5A:
Using an external CT (current transformer), properly suited
for the detected Current value, connect the secondary side of
the CT to the input terminal of the relay. Calculate the
secondary current CorresDonding to the detected current
value, based on the CT ratio. Then set the current adjusting
Knob to this calculated value.
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6.2 Setting the detection delay tiae
Setting time varies depending upon each individual aDDlication.
Adjust the detection delay tile according to the following:
(1) Hotor load
TO avoid detection during start-up, set the delay tire to
aDDroxisately 120% of starting tile.
(2) Transformer load
If the inrush current (inrush time varies deDending uDon
caDacity) is large, set the delay tile to approximately
120% of this inrush tile. Genenrally, If the caDacity is
Wall, inrush time is short and therefore, even when the
adjusting knob is set at the minims position. there should
not be any nuisance tripping.
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6.3 Setting the ResDonse delay time
Adjust the set tile according to the ourgose of detection (I.e.
overcurrent or undercurrent). The set tire for the resoonse
delay varies ger aDDllcation.
Host applications cay not need
any delay tile. It is aainly used to prevent nuisance trioging
(ride through) by ignoring aoeentary load gliches.
7. Ooerational lest
(1) Check both the control and detection circuits to confirm there
is no eis-wiring.
(2) Check if the current dedtction tiae delay, and resgonse
tiae delay settings are correct.
(3) If the wiring ard settings are correct, energize the control
circuit and check if it is the erooer voltage.
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(4) When the Dower source is aDDlied. the relay is excited and the
OutDut contact’s states are reversed. The relationshiD between
the input signal end the outDut contacts are shown in Table 2.
Check this relationship during the test.
Table 2
(5) If no Droblea is found when the Dower source is aDDlied. turn
the rain circuit switch ON and Derforg the following checks:
(a) In the case of a motor load
If the set start-up tiae delay is too short, the relay say
be actuated. In such a case, reset the detection delay tiae
adjusting knob accordingly. After the start-up tiae delay
has exDired. apply current above the set detection value
to confirm that the relay functions (after the resoonse
delay tile), In addition, check that the detection
indicating lamp lights at the sale time the relay ODerates.
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6F9E0090
(b) When undercurrent or disconnection is detected
At the sale time the lain circuit switch is turned OH, the
starting current and rated current flows, and the relay is
picked UP.If current drODS below the undercurrent set point,
the undercurrent State is detected and the relay drops out.
(Refer to Fig. 5)
Caution: If input signal to this current relay is zero (When
StoDDed).
it is not possible to judge if it is undercurrent or in a
disconnected state. In this case, it is recommended to
have a circuit connecting a normally oDen auxiliary con-
tact of the Dain circuit switch in series with the alara or
IauD circuit. this will Drevent the relay fror signalling a
fault condition during a normal shutdown.
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TOSHIBA
6F9E0090
(6) If the relay does not operate in the above test, check if
the current setting is correct or if the ingut signal is
above the set detection value. If the
ingut signal is
correct, check the operation of the relay by gradually
reducing the setting of the current adjusting knob. If the
relay still does not ooerate. it is defective. In this case,
please contact the dealer froa which you purchased the relay
or Toshiba.
Power Source -
Detected current
Overcurrent
detect ion -
Undercurrant
I-/ T3
detect ion
I
Tl: Detection delay tire
T2: Overcurrent detecting resgonse delay tiler
T3: Undercurrent detecting resgonse delay tlaer
Fig. !i Relay Operation
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8. Cover Reroval
To adjust the current and time settings the cover must be raaoved.
Reaove the cover by amlYing a force in the direction of the arrow
as shown below. To replace the cover, place the projection of the
cover in the slip out oreventive hole and then insert the bosses
of the cover into the 2 holes at the uooer left and right.
Cover
Ak
i
z
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TOSHIBA CORPORATION