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 +50°C (-14° to +122°F)
Storage temperature
-50° to +85°C (-58° to +185°F)
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
µ
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)
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