19
3. SETUP AND USE
3.1 CONTROL AND INDICATORS
NO.
NAME
FUNCTION
1
FULL LOAD CONTROL
Sets the maximum average RMS motor
current at which overload pickup occurs.
Calibrated in % CT rated amps.
2
STALL TIME
Selects one of eight overload time curves
based on stall times at 6 times inrush
current.
3
OVERLOAD
INDICATOR
Flashing - motor current exceeds full load
setting (overloads or starting).
4
GROUND FAULT
(EARTH LEAKAGE)
TIME DELAY CONTROL
Sets level of ground fault current
necessary to cause a trip. Calibrated in
amps.
5
GROUND FAULT
(EARTH LEAKAGE)
TIME DELAY CONTROL
Sets time ground fault current must
exceed level setting before a trip.
Calibrated in seconds.
6
OVERLOAD
INDICATOR
Set whenever overload or mechanical
jam trip occurs.
7
UNBALANCE
INDICATOR
Set whenever single phase trip occurs.
8
THERMISTOR
INDICATOR
Set when thermistor senses an
overtemperature and relay trips.
9
GROUND FAULT/
EARTH LEAKAGE
INDICATOR
Set when ground fault trip or ground fault
alarm occurs.
10
TEST TRIP
Activates trip indicators (6-9) and the trip
relay when pressed.
11
RESET
Resets all fault indicators and trip relay.
12
READY INDICATOR
Indicates the output contacts are
untripped ready for motor starting.
13
FAULT INDICATOR
Indicates the output contacts are tripped
due to a fault condition. Motor cannot be
started.
Summary of Contents for PROTECT 4A-120
Page 1: ...MOTOR PROTECTION RELAY INSTRUCTION MANUAL ...
Page 5: ...2 FIGURE1 1 PROTECT 4A TYPICAL SYSTEM CONNECTION ...
Page 11: ...8 FIGURE 2 2 PHASE CT DIMENSIONS FIGURE 2 3 GROUND FAULT CT DIMENSIONS ...
Page 21: ...18 FIGURE 3 1 FRONT PANEL LAYOUT ...
Page 35: ...32 FIGURE 4 1 SINGLE PHASE INJECTION TESTING FIGURE 4 2 100 AMP CURRENT SOURCE ...
Page 39: ...36 FIGURE 4 3 GROUND FAULT EARTH LEAKAGE TEST ...
Page 44: ...41 FIGURE 5 1 HARDWARE BLOCK DIAGRAM ...
