Hyundai HG Series Manual page 12

12
Electronic Motor Protection Relays
Technical Data
Functions
Function Inventory
Functions
Protection from overload damage based on motor's thermal characteristics
Overcurrent Trip initiated when current exceeds 112.5 % of set rated current, based on operating time
characteristics (inverse/definite time)
Protection from unloaded operation due to motor load breakdown
Undercurrent
Trip initiated according to set undercurrent multiple and runtime
Protection from phase failure due to short or contact failure
Phase Failure
Trip initiated at set time if phase difference exceeds 70 %
Phase Protection from phase unbalance due to insulation failure or incorrect wiring
Unbalance Trip initiated at set time if phase different exceeds pre-set parameters
Protection from motor slowdown or lock due to increased load under operation
Protection
Stall If overcurrent occurs in definite time, trip initiates when current exceeds a set multiple
Function
after the delay period
Protection from motor damage due to sudden increase in load or a lock
Lock If overcurrent occurs in definite time, trip initiates when current exceeds set multiple
factor after the delay period
Protection from motor reversal due to Incorrect wiring
Reverse Phase
Detects reversal during startup and trips within 100 msec
Earth Eakage/ Protection from current leakage due to insulation failure or damage
Ground Fault Trip initiated when current leakage exceeds set parameters
Protection from shorts of more than two phases due to motor insulation failure or Incorrect
Instantaneous
wiring Trips within 50 msec for current in excess of set multiple factor
Alert activated to prevent a trip from a sudden overcurrent event
Overload Warning
Alert switch activates until trip when current exceeds the set activation multiple
Cumulative runtime under minimum of 70 % rated current during relay lifetime
Cumulative Runtime
Unit : hours
Runtime management for maintenance, i.e. motor oil replacement
Runtime Alert
Indicator activates after pre-set runtime is reached
Increases the number of CT turns for low current; external CT is used for high current.
Actual motor current and current indicated on relay converted to correlate
CT Ratio
CT ratio is set to convert rated current parameters and indicated value
(Ex.) For 100: 5 CT, CT ratio set at 20
Delay Delay time for protection function based on motor startup characteristic
Test Check relay and sequence status without energizing circuit
Output contact activation method selectable 95-96, 97-98: 1a1b, 2a, 2b
Contact Auxiliary contact activation method selectable 07-08 : Dedicated for overcurrent alert,
ground fault or instantaneous
Select RESET method after trip
Manual (non) / Electrical (Pr) / Automatic (0 ~ 20 min) RESET can be selected :
RESET - Manual reset by pressing the RESET button
- Electrical reset by switching the power off
- Automatic reset by timer (Timer resumes if power is turned off/on before reset)
Overcurrent protection curve based on motor thermal conditions
Cold/Hot Curve - Cold : initial period of operation after period of inactivity
- Hot : sufficient heat applied after motor has been in sustained operation
※ 1) Under instantaneous setting, auxiliary terminal 07-08 is automatically set to instantaneous terminal. Refer to information on operational characteristics for details
Details Notes
Basic function refer to
cold/hot curve function
Refer to cold/hot curve
function
Selectable function
Selectable function
Selectable function
Only usable under definite
time setting
Selectable function
Only usable under definite
time setting
Selectable function
Selectable function
Selectable function
Dedicated terminal
1)
Selectable function
Alert terminal removed under
instant-time setting
RESET disabled
Selectable function
0.25, 0.5, 1 ~ 200
Selectable function
Off during operation under
Manual reset available for
electrical and automatic
settings
Applicable only for inverse
time overcurrent protection
characteristics