EOCR-3EZ

Digital Over-current Relay with Ground Fault Protection and Ammeter

◆ Introduction ◆ Relay Facia
► MCU(Micro Controller Unit) based
► Function feature
Protected Item Operation Delay
0.5 / 1~30 sec(Definite time)
Over current
1~30 class(Inverse time)
Undercurrent 0.5 / 1~30 sec(Definite time)
Phase Loss Within 3 sec
Phase Reversal 0.1 sec
Unbalance Within 8 sec
Locked Rotor Trip after preset ‘dt’
Stall 0.5 / 1~10 sec(Definite time)
Ground Fault 0.05~10 sec(Definite time)
► Ampere meter function :
- Load current of 3 phases are displayed in sequence
- Display time of each phase current is 5 sec
► Over current protection range ◆ How to set
- 0.5~60A(wide range type) : displays line current under 100A Search a mode to be adjusted by depressing UP/DN
Mode
mode switch.
- 11~960A with external CT
Selected mode and setting value start flickering which
► Undercurrent protection range
Set means to be ready to accept setting as depressing
: 0.5A ~ less than oc setting value / OFF(- -)
once a Set/store button
► Ground Fault
Select a required setting value and/or characters by
- Operated by zero sequence current.
Adjust depressing continuously UP/DN mode switch until
- A Type : 0.02~3A(Definite time type)/OFF(--) reaching what want to do.
B Type : 0.2~10A(Definite time type)/OFF(--) Store a selected value and/or characters by
► Time-Current characteristics Store depressing once Set/store button. Instantaneously the
- 0.5~10A : Definite/Inverse, selectable flickering is stopped.
- Equal or more than 11A After completing above procedure, make a reset to be
: definite(if inverse required, use with external CT) Reset ready to operate. If not made reset, it will be reset
► Easy troubleshooting by 7 segment LED. automatically after an elapse of 30 sec.
► Trip cause memory : Last 3 trip, stored regardless power Instead of automatic rotation, manual display
failure. rotation is possible as depressing once SET/ Store
► Reset : manual(instantaneous)/electrical(remote) Current rotation by button during an operation. If manual is selected, the
► Fail safe(self-diagnostics) : The output relay of “OL” is Manual information of phase current L1 is displayed firstly and
energized when control power applied. next information is displayed continuously like a
► Appicable to Inverter(20~400Hz) manner of L1→L2→L3→GF→L1→….
• Enter into “trip” mode by depressing once Set/store
◆ Typical Application Diagram button, then last trip cause is showed.
• Each phase current is displayed in order whenever
How to check trip
depress UP/DN button in every once
cause
• The 2nd trip cause is showed after displaying
3 phase current of last trip
• The 3rd trip can be checked by same manner.

Table#1
Number of
Current Setting
Conductors External Setting of
Range Remark
thru CT CT Ratio CT Ratio
(Amps)
windows
0.5∼60A OFF
1 - Wide Range
(Mode:--)
0.25∼3.0A 2 - 2t
0.1∼1.2A 5 - 5t
1∼12A 1 10:5 10
1.5∼18A 1 15:5 15
2.0∼24A 1 20:5 20
2.5∼30A 1 25:5 25
3.0∼36A 1 30:5 30
4.0∼48A 1 40:5 40
5∼60A 1 50:5 50
6∼72A 1 60:5 60
7.5∼90A 1 75:5 75
10∼120A 1 100:5 100
12∼144A 1 120:5 120
15∼180A 1 150:5 150
20∼240A 1 200:5 200
25∼300A 1 250:5 250
30∼360A 1 300:5 300
40∼480A 1 400:5 400
50∼600A 1 500:5 500
60∼720A 1 600:5 600
75∼900A 1 750:5 750

80∼960A 1 800:5 800

[Type here]

Model EOCR-3EZ
Over-current(oc) 0.5 ~ 60A
Under-current(uc) 0.5A ~ Less than “oc” setting value./ OFF
Current Setting Range
A Type : 0.02 ~ 3A(Definite time type) / OFF
Ground Fault current(Ec)
B Type : 0.2 ~ 10A(Definite time type) / OFF
Starting Delay Time(dt) 1 ~ 200 sec(Definite time type) / OFF
Over-current Trip Delay(ot) 0.5 / 1~30 sec(Definite time), 1~30 class(Inverse time)
Time Setting Under-current Trip Delay(ut) 0.5 / 1~30 sec(Definite time)
Ground Fault Trip Delay(Et) 0.05 ~ 10 sec(Definite time)
Ground Fault Starting
OFF / 1~10 sec(Definite time)
Delay Time (Ed)
Reset Manual Depressing Reset button or control voltage interruption
• Overcurrent
- 0.5~10A : definite / inverse, selectable
Operation Characteristic Definite/Inverse,selectable
- more than 11A : definite(If inverse time required, use with external CT)
• Undercurrent : definite
Current I < 1A : ±0.05A, I ≥ 1A : ±5%
Tolerance
Time t ≤ 3s : ±0.2s, t > 3s : ±5%
Storage -30~80°C
Ambient Temperature
Operation -20~60°C
Ambient Humidity 30~85% RH without Condensation
• 220VAC : ±15%, 50/60Hz
Control Voltage • 110VAC : ±15%, 50/60Hz
• 24VAC/DC
• (OL/UL)1-SPST 3A/250VAC, Resistive
Contacts
Output Contacts • (GR) 1-SPST 3A/250VAC, Resistive
Condition Normally Energized in FS:ON, 97─┤├─98 Closed.
Insulation Between Casing & Circuits Over 10MΩ(DC 500V Megger)
Between Casing & Circuits 2㎸ 60Hz 1min.
Dielectric Strength Between Contacts 1㎸ 60Hz 1min.
Between Circuits 2㎸ 60Hz 1min.
Mounting 35mm Din Rail or Panel
Power Consumption Less than 3W
Electrostatic Discharge IEC61000-4-2 Level 3: Air Discharge : ±8㎸, Contact Discharge: ±6㎸
Radiated Electromagnetic
IEC61000-4-3 Level 3: 10V/m, 150MHz & 450MHz Portable transceiver
Field Disturbance
EFT / Burst IEC61000-4-4 Level 3: ±2㎸, 1min
Surge IEC61000-4-5 Level 3: 1.2×50㎲, ±2㎸(0˚, 90˚, 180˚, 270˚)
1MHz Burst disturbance IEC61000-4-12 Level 3: 2.5kV, 1MHz
Conducted Emission EN55011 Class B
◆ Time-Current Characteristics █ how to setup

1) Current :
Definite Time – Set the rated motor current
in “OC” mode. For protection of connected
machinery with motor, it is recommended to
set the 110~115% of running current after
motor current is stabilized.
Inverse Time – 100% of rated motor current
or 110~125% actual motor current is
recommended.
2) D-Time : Set the expected run-up time of
motor in “dt” mode.
3) O-Time :
Definite Time – Set the desired trip delay time
in “ot” mode.
Inverse Time – Set the trip delay time
according to Time-Current characteristics.
4) Ground Fault :
Set the ground fault current in “Ec”, set Its
operating time “Et”, and then delay time in
“Ed” .

Table#2. <Definite time characteristics of OC> Table#3. <Inverse time characteristics of OC>
0.5~10A / combined with external CT
█ Display Setting
Function Setting Range FND Display Description
▪ 0.5~10A : 0.1A steps.
▪ 10~60A : 1A steps.
▪ Not possible to set a current value over 10A if inverse characteristics
1 Over-current 0.5A~60A is selected.
▪ Required to set a preset protected value(<6A) at first based on CT
secondary output before setting a CT ratio if needed to adopt external
CT instead of wide range[“CT”:OFF(--)].
▪ 1~100sec : 1 sec steps.
2 Starting Delay Time 1~200sec / OFF(dt--)
▪ 100~200sec : 10 sec steps.
▪ Within 0.5sec / 1~30sec ▪ 0.5sec / 1~30sec : 1sec steps.
Over-current
3 (definite time) ▪ Operated after “Starting Delay Time”
Trip Delay Time ▪ 1~30 class(Inverse)
▪ Not possible to set over “over-current set-value(“oc”)”.
0.5A~less than “oc” setting
4 Under-current ▪ 0.5, 1~10A : 0.1A steps.
value / OFF(uc--) ▪ 10A ~ : 1A steps.
Under-current ▪ 0.5sec / 1~30sec : 1sec steps.
5 Within 0.5sec / 1~30sec
Trip Delay Time ▪ Operated after “Starting Delay Time”
• A Type :0.02~3A /OFF(Ec--) • Operated by zero sequence current.
6 Ground Fault
• B Type :0.2~10 A /OFF(Ec--)
Ground Fault Trip • 0.05~10 sec(Definite time) • 0.05 / 0.1~1 sec : 0.1 sec steps.
7 • 1~10sec : 1 sec steps.
Delay Time
Ground Fault • 1~10 sec • OFF : Disable
8
Starting Delay Time • OFF(Ed--)
▪ Definite
▪ 2~10 times of oc setting ▪ Tripped within 0.5 sec, After elapse of “dt”.
9 Locked Rotor ▪ OFF(Lc--) ▪ The decreased proportional % of “Lc” is determined by follow
formular, [Max. value of “Lc”=100/”oc” setting value]
▪ Definite
▪ 1.5~5times of oc setting ▪ Tripped after elapse of preset time(“St”)
10 Stall ▪ OFF(Sc--) ▪ More than 11A: Set automatically by proper decreased %.
▪ The decreased proportional % of “Sc” is determined by follow
formular, [Max. value of “Sc”=100/”oc” setting value]
Operating Time of ▪ In case of “Sc:OFF”, “St” mode becomes OFF automatically
11 Within 0.5sec / 1~10sec
Stall
Phase current ▪ [ ( Max curr. – Min curr. ) / Max ] x 100[%] > Ub setting %
12 5~50% / OFF(Ub--)
Unbalance
13 Fail Safe ON(FSon), OFF(FS--) ▪ Impossible to set during operation.

14 Phase Reversal ON(RPon), OFF(RP--) ▪ Tripped 0.1sec.

15 Phase Loss ON(PLon), OFF(PL--) ▪ Tripped within 3 sec.

▪ Definite: Followed by Table #2

Time characteristics ▪ Definite(tcdE) ▪ Inverse: Followed by Table #3
16 ▪ Inverse(tcIn)
for over-current ▪ In case of “oc” setting value is more than 11A, applied for definite
characteristics automatically.
▪ OFF(ct--) : wide range(0.5~60A).
▪ 5t : Displayed the current more than 0.04A.
OFF-5t,2t,
▪ 2t : Displayed the current more than 0.1A
10-15-20-25-30-40-50-60-75-
17 CT Ratio ▪ Required to set a current value under 6A based on CT secondary
100-120-150-200-250-300-400-
output if need to adopt external CT instead of wide range
500-600-750-800
[“CT”:OFF(--)] Refer detail in “oc” mode.
▪ Not possible to adjust during the operation
▪ Stored the trip causes, regardless power is off.
Memorized the last 3 trip
18 Trip Cause Memory ▪ The stored information is displayed from last trip causes and able to
causes
check each phase current when tripped.
Not permitted to test this
19 Test function during the operation to →(3sec) →(o-time)
prevent the unnecessary trip. Not possible to test during the operation.
█ Dimension

※ In case that time-current characteristics of EOCR is inverse

and over current setting is more than 10A, use SRCT only.

◆ Ordering Information
Model name 1 2 3 4 Accessory1 Accessory2
E O C R 3 E Z H 1 A M 7 A 3CT-H1-100 ZCT-035

1 2 3 4
Current range Relay Power supply Frequency Converter
Output
EOCR3EZWRAM7A Wide WR a-a A 220VAC M 50/60Hz 7 0.02 ~ 3.0A A
EOCR3EZWRAF7A range type 110VAC F 0.2 ~ 10 A B
EOCR3EZH1AM7A 100:5 H1 220VAC M
EOCR3EZH1AF7A 110VAC F
EOCR3EZHHAM7A 150:5 HH 220VAC M
EOCR3EZHHAF7A 110VAC F
EOCR3EZH2AM7A 200:5 H2 220VAC M
EOCR3EZH2AF7A 110VAC F
EOCR3EZH3AM7A 300:5 H3 220VAC M
EOCR3EZH3AF7A 110VAC F
EOCR3EZH4AM7A 400:5 H4 220VAC M
EOCR3EZH4AF7A 110VAC F
※ 3CT - H1,HH,….H4
Accessory1 < SRCT - S1,SH,….S4
3CT Ratio SRCT Ratio
3CT- H1-100 H1 100:5 SR-3CT-100 100:5
3CT- HH-150 HH 150:5 SR-3CT-150 150:5
3CT- H2-200 3CT - H2 - 200:5 SR-3CT-200 SR - 3CT - 200:5
3CT- H3-300 H3 300:5 SR-3CT-300 300:5
3CT- H4-400 H4 400:5 SR-3CT-400 400:5
Accessory2
ZCT Diameter
ZCT- 035 35 Ø
ZCT- 080 ZCT - 80 Ø
ZCT- 120 120 Ø