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
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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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=rosHl=A
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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TOSHIBA
6F9EO090
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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TOSHIEA
6F9E0090
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
6F9E0090
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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TOSHIBA
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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TOSHIBA
6F9Eoo90
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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