P51925
Rev 02
Effective: August 2007
Page 2
Questions? Call our Sensor Application Engineers at (800) 426-9184.
POWER SUPPLY NOTES
All low-current ground-fault sensors are sensitive devices that require
reasonable care in system design to avoid false trips caused by high
electrical noise levels. Keep in mind that the best way to reduce noise in
a system is to suppress it at its source.
• Keep the sensor power isolated from noisy circuits
• Do not power the sensor with the same circuit that switches
contactors or other high current inductive loads
SYSTEM GROUNDING
Good design practice and code require that all AC power systems be
grounded. The EGF Series sensors are designed to work on grounded
AC power systems. They may not operate properly on ungrounded
systems.
SPECIFICATIONS
Specifi cation
Value
Power Supply
120V AC (Operates from 66-132V)
Voltage Range
Up to 1,500V AC (Monitored Circuit)
Power Consumption
2.5W
Output
Magnetically Isolated Solid State Switch
Output Rating
AC Models:
1A @ 240V AC (2A for 10 Min.)
DC Models:
0.15A @ 30V DC (500 mA Momentary)
Response Time
At 5% Over Setpoint: 150 ms
At 50% Over Setpoint: 100 ms
Setpoint Range
Models Ending -T3:
5, 10 or 30 mA (Adjustable by Jumper)
All Other Models:
50 or 100 mA (See “Setpoint Adjustment”)
Frequency Range
50-400Hz (Monitored Circuit)
Housing
UL94 V0 Flammability Rated
Dimensions
Housing: 2.5 in. H x 2.8 in. W x 1.5 in. D (64x71x38mm)
Aperture: 0.75 in. (19mm)
LED
Green = Power Supply Energized
Environmental
Operating Temperature: +5 to +158° F (-15 to +70° C)
Humidity: 0-95% RH, Non-Condensing
Approvals
UL1053, Class 1 Recognized
CE Certifi ed
490020207
PRINCIPAL OF OPERATION
Under normal conditions, the current in one wire of a two wire load is
equal in strength but opposite in sign to the current in other wire. The
two wires create magnetic fi elds that cancel, a condition known as
“Zero Sum Current.” If any current leaks to ground (Ground Fault), the
two currents become unbalances and there is a net resulting magnetic
fi eld. The EGF Series sensor detects this minute fi eld and change the
output state. This concept extends to three phase systems such as 3-
wire Delta and to 4-wire Wye.
OPERATION
To test operation, gently press the TEST button. This simulates a fault
and tests the internal switching circuits. The following operation should
be observed.
CAUTION: Any circuit connected to the sensor will be
operated.
Normally Energized Models
Used for detecting ground faults and loss of control power.
Output
No Power
Control Power Applied
No Fault
Fault Detected
Output
LED
Output
LED
Output
LED
N.C.
Closed
Off
Open
On
Closed
Off
N.O.
Open
Off
Closed
On
Open
Off
Normally De-Energized Models
Used for detecting ground faults only.
Output
No Power
Control Power Applied
No Fault
Fault Detected
Output
LED
Output
LED
Output
LED
N.C.
Closed
Off
Closed
Off
Open
On
N.O.
Open
Off
Open
Off
Closed
On
SETPOINT ADJUSTMENT
The EGF Series sensors are factory calibrated to trip at the setpoint
specifi ed by the model number. While it is generally recommended not
to change this setpoint, it can be done by following the below steps.
1. Connect control power and circuits. Run a conductor through the
aperture with current equal to your desired setpoint.
2. Adjust setpoint to maximum by fi rst removing the setpoint cover.
Turn the adjustment pot four revolutions counter-clockwise to the
maximum (least sensitive) setpoint. The Status LED should be off.
The adjustment pot has a slip clutch so that you cannot feel or
damage the end point.
3. Dial in the new setpoint by slowly turning the pot clockwise until
the LED turns on. The sensor is now adjusted to trip at the current
that is passing through the aperture. Reset the sensor.
4. Relabel the sensor with a new setpoint. Use a label maker or tape
with a permanent marker.
Power
Output
Power
Interupt
A
B
C
N
3
Wye Power
3 Load
Power
Output
Power
Interupt
HOT
NEUT
1 Power
1 Load
Power
Output
Power
Interupt
A
B
3 Power
1 Load
Power
Output
Power
Interupt
A
B
C
3 Delta Power
3 Load
