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EOCR-i3BZ/iFBZ/3BZ2/FBZ2
EOCR-i3BZ / iFBZ : Intelligent Digital Over-Current, Earth Fault Relay with built-in ZCT,
EOCR-3BZ2 / FBZ2 : Economic Digital Over-Current, Earth Fault Relay with built-in ZCT
Item Operating Condition & Setting Range Operation Time
Over Current (oc) Load current(In) exceeds threshold(Is) Definite(Def) : 0.2~30s Adjustable
Setting Range : 0.5~80A(Def), 0.5~32A(Inv & th) Inverse(Inv) & Thermal(th) : 1~30 Class
Under Current (uc) Load current(In) less than threshold(uc) In <= uc oFF, 1~30s Adjustable
uc should be less than oc Setting
Phase Loss (PL) max imbalance is more than 85% among 3 phase current, oFF, 0.5~5s Adjustable
Enable or disable : Selectable
Reverse Phase(rP) Reversed phase sequence input on EOCR. Within 0.15s
Enable or disable : Selectable
Active only in motor starting, In ≥Stall threshold (Sc×OC).
Stall (Sc) Setting Range : Adjustable Immediately after D-Time elapsed
2~8 times of oc setting if Sc×OC doesn’t exceed 250A
Active only in motor running, In ≥Jam threshold (JA×OC).
Jam (JA) Setting Range : 0.2~10s Adjustable
1.5~8 times of oc setting if JA×OC doesn’t exceed 250A
Current unbalance ≥threshold1~10s Adjustable.
Unbalance (ub) Setting Range : 10~50% 1~10s Adjustable
Unbalance[%] = 100 ×(Max phase current -Min phase current)/
Max phase current
Earth Fault (EF) EF current(Ie) exceeds threshold(Ies) 0.1~10s Adjustable
Setting Range : oFF, 0.03~10A
Protection functions
Password Secure configuration, available only with i3BZ/iFBZ
Communication Serial network communication for monitoring of metering, status, and fault history
Fail Safe Enable/Disable fail-safe operation of OL trip output
Phase selection Select a Single-phase motor or 3-Phase motor
Total Running-Hour Record of total running from installation which cannot be modified or cleared
Running-Hour Accumulated running hour from preset point which can be cleared to zero, when motor stops
Fault History Records for recent 3 faults each phase current which stored in a non-volatile memory
Limitation of autoreset attempt Block auto-reset if the reset count exceeds the pre-set count within 30 minutes
Auxillary functions
Item Setting Remark
Protocol type Modbus RTU
Communication type RS-485
Baud rate 1.2, 2.4, 4.8, 9.6, 19.2, 38.4 kbps
Maximum length of the bus
Maximum 1.2kM Depend on the environment
Type of trunk cable RS-485 Shielded Twist 2-Pair Cable
Communication function (Applicable to i3BZ/iFBZ)