Specifications are subject to change without notice (26.10.99)
1
Type EFA
Current and Voltage Controls
Frequency Monitoring Control
Microprocessor-based frequency
measurement
10-position rotary switch for selection of bandwidth
Separate setting of upper/lower limits
Monitors on own power supply
2 separately adjustable time functions (0.1-30 s)
Quartz-controlled digital circuit
Selectable centre frequency 50/60 Hz
Output: 2 x 5 A SPDT relays (one relay for each level)
For mounting on DIN-rail in accordance with
DIN/EN 50 022
45 mm Euronorm housing
LED-indication for power supply ON
Two LED's indicating fault and/or status of relay
output (flashing when timing)
Galvanically separated power supply
Product Description
Ordering Key
Housing
Function
Type
Output
Power supply
EFA is monitoring the fre-
quency of an AC power sup-
ply with the possibility of sepa-
rate adjustment of upper/
lower limits. This relay offers
the user many application
possibilities e.g. in connec-
tion with wind-driven genera-
tors or similar equipment.
Type Selection
Mounting
Output
Measuring range
Supply: 24 VAC
Supply: 115 VAC
Supply: 230 VAC
For DIN-rail
2 x SPDT
50-60 Hz
EFA C 024
EFA C 115
EFA C 230
Input Specifications
Input
Through terminals A1 & A2
Measuring on own power
supply
Measuring range
Upper level
Lower level
Bandwidth selectable by
2 separate rotary switches
0.5 Hz
0.5 Hz
1.0 Hz
1.0 Hz
1.5 Hz
1.5 Hz
2.0 Hz
2.0 Hz
2.5 Hz
2.5 Hz
3.0 Hz
3.0 Hz
4.0 Hz
4.0 Hz
5.0 Hz
5.0 Hz
6.0 Hz
6.0 Hz
10.0 Hz
10.0 Hz
Output Specifications
Output
2 x SPDT relay
Rated insulation voltage
250 VAC (contact/elect.)
Contact ratings (AgCdO)
(micro gap)
Resistive loads
AC 1
5 A, 250 VAC
DC 1
5 A, 24 VDC
Small inductive loads AC 15
2 A, 250 VAC
DC 13
3 A, 24 VDC
Mechanical life
40 x 10
6
operations
Electrical life
10
5
operations
(at max load)
Operating frequency
7200 operations/h
Dielectric strength
Dielectric voltage
2 kVAC (rms)
Rated impulse withstand volt. 4 kV (1.2/50 s)
Supply Specifications
Power supply
Overvoltage cat. III (IEC 60664)
Rated operational voltage
(IEC 60038)
Through pins A1 & A2 024
24 VAC 15%, 40 to 70 Hz
115
115 VAC 15%, 40 to 70 Hz
230
230 VAC 15%, 40 to 70 Hz
Voltage interruption
40 ms
Dielectric voltage
2 kVAC (rms)
Rated impulse withstand
voltage
4 kV (1.2/50 s)
Rated operational power
3 VA
EFA C 230
2
Specifications are subject to change without notice (26.10.99)
EFA
General Specifications
Power ON delay
200 ms
Power OFF delay
> 250 ms @ 230 VAC
Reaction time
400 ms
Accuracy
Frequency
0.01%
Time delay
0.1-30 s 15%
Temperature drift
0.01%/C (
0.006%/F)
Hysteresis
0.5%
Indication for
Power supply ON
LED, green
Output ON
2 LED's, yellow (indicating
upper/lower level)
Environment
Degree of protection
IP 20
Pollution degree
3
Operating temperature
-10 to +50C (-14 to +122F)
Storage temperature
-50 to +85C (-58 to +185F)
Weight
250 g
Screw terminals
Tightening torqu
Max. 0.5 Nm acc. to IEC 60947
Approvals
UL, CSA
Mode of Operation
EFA measures the frequency
of its own sinusoidal power
supply, and the output relay is
energized as long as the fre-
quency is within the set up-
per/lower limits. This is indi-
cated by the two built-in yel-
low LED's.
If the frequency rises above
the set upper limit, then the
centre yellow LED starts to
flash and the output relay re-
leases after the set time pe-
riod.
If the frequency drops below
the set lower limit, then the
right yellow LED starts to flash
and the output relay releases
after the set time period.
There will be no LED-indica-
tion after the time delay has
expired.
EFA has a power ON delay of
approx. 200 ms to prevent the
relay from operating under in-
rush conditions.
Range setting
Upper left knob:
Setting of upper limit on rotary
switch.
Lower left knob:
Setting of lower limit on rotary
switch.
Frequency range setting
Upper right knob:
Rotary switch for selection of
frequency range.
Time setting
Lower right knob:
Setting of time delay on abso-
lute scale (0.1-30 s) for lower
frequency range.
Centre right knob:
Setting of time delay on abso-
lute scale (0.1-30 s) for upper
frequency range.
Wiring Diagram
N
L
Range/Time Setting
Operation Diagram
Hysteresis
Lower frequency limit
Upper frequency limit
Hysteresis
Power supply
Relay 2 upper ( 25/26/28)
Relay 1 lower ( 15/16/18)
PDF 
ZIP