Specifications are subject to change without notice (10.10.05)
1
Monitoring Relays
Frequency monitoring
Type DFC01
Over and under frequency monitoring relay
Measures if power supply frequency is within set limits
Measures on own power supply
Separately adjustable upper/lower level on relative
scale
Separately adjustable delay functions (0.1 to 30 s)
Output: 2 x 8 A SPDT relays
For mounting on DIN-rail in accordance with
DIN/EN 50 022
45 mm Euronorm housing
LED indication for relays, alarm and power supply ON
Product Description
DFC01 is a precise frequen-
cy monitoring relay. It moni-
tors its own power supply.
Overfrequency and under-
frequency can be monitored
separately with two indepen-
dent setpoints, delay times
and relay outputs.
The LED's indicate the state
of the alarm and the output
relay.
Type Selection
Mounting
Output
Supply: 24/48 VAC
Supply: 115/230 VAC
DIN-rail
2 x SPDT
DFC 01 D B48
DFC 01 D B23
Input Specifications
Input
Own power supply
A1, A2 or A2, A3
Measuring ranges
Upper level
Lower level
Selectable by DIP-switches
2 Hz range
+0.2 to +2.2 Hz -2.2 to -0.2Hz
50 Hz
50.2 to 52.2 Hz 47.8 to 49.8 Hz
60 Hz
60.2 to 62.2 Hz 57.8 to 59.8 Hz
10 Hz range
+1 to +11 Hz -11 to -1 Hz
50 Hz
51 to 61 Hz
39 to 49 Hz
60 Hz
61 to 71 Hz
49 to 59 Hz
Ranges
Upper frequency level
+10 to +110%
of the selected range
Lower frequency level
-110 to -10%
of the selected range
Hysteresis (frequency)
2 Hz range
~ 0.05 Hz
10 Hz range
~ 0.25 Hz
Ordering key
DFC 01 D B23
Housing
Function
Type
Item number
Output
Power Supply
Output Specifications
Output
2 x SPDT relays N.E.
Rated insulation voltage
250 VAC
Contact ratings (AgSnO
2
)
Resistive loads
AC 1
8 A @ 250 VAC
DC 12
5 A @ 24 VDC
Small inductive loads AC 15
2.5 A @ 250 VAC
DC 13
2.5 A @ 24 VDC
Mechanical life
30 x 10
6
operations
Electrical life
10
5
operations
(at 8 A, 250 V, cos
= 1)
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
Rated operational voltage
(IEC 60664, IEC 60038)
through terminals:
A1, A2 or A3, A2
B48:
24/48 VAC 15%
40 to 70 Hz, insulated
B23:
115/230 VAC 15%
40 to 70 Hz, insulated
Rated operational power
5 VA
2
Specifications are subject to change without notice (10.10.05)
General Specifications
Power ON delay
1 s 0.5 s
Accuracy
(15 min warm-up time)
Temperature drift
1000 ppm/C
Delay ON alarm
10% on set value 50 ms
Repeatability
0.5% on full-scale
Reaction time
Frequency level
Alarm ON delay:
< 200 ms (delay < 0.1 s)
Alarm OFF delay:
< 200 ms (delay < 0.1 s)
Indication for
Power supply ON
LED, green
Alarm ON
LED, red (flashing 2 Hz
during delay time)
Output relays ON
2 x LED, yellow
Environment
(EN 60529)
Degree of protection
IP 20
Pollution degree
3
Operating temperature
-20 to +60C, R.H. < 95%
Storage temperature
-30 to 80C, R.H. < 95%
DFC01
Function/Range/Level/Time Setting
Select the desired function
setting the DIP-switches 1 to
6 as shown on the right. To
access the DIP-switches
open the plastic cover using
a screwdriver as shown
below.
Centre left knob:
Setting of upper frequency
level on relative scale.
Centre right knob:
Setting of lower frequency
level on relative scale.
Lower knobs:
Setting of delays on alarm
time on absolute scale:
0.1 to 30 s.
Output
ON:
2 x SPDT relays
OFF:
1 x DPDT relay
Relay working mode
ON:
Normally De-energized
OFF:
Normally Energized
System frequency
ON: 60 Hz
OFF: 50 Hz
Frequency setpoint range
ON: 2 Hz
OFF: 10 Hz
Power ON delay
ON: 6 s 0.5 s
OFF: 1 s 0.5 s
Mode of Operation
DFC01 monitors the fre-
quency value of its own
power supply.
Example 1 (N.D. relay)
Both relays are OFF as soon
as the frequency is above
the lower setpoint and below
the upper setpoint. When the
measured frequency
exceeds the upper set level
for more than the set delay
time relay 1 is turned ON; if it
drops below the lower set
level for more than the set
delay time relay 2 is turned
ON. Each relay releases
when the measured frequen-
cy comes back within its lim-
its. The red LED flashes until
the delay time has expired or
the measured value falls off
the limits.
Example 2 (N.E. relay)
The relay operates and the
yellow LED is ON as long as
the measured frequency is
within the upper and lower
limits.
Relay 1 releases in alarm
position as soon as the mea-
sured frequency exceeds the
upper set level for more than
the set delay time; relay 2
releases as soon as the
measured frequency drops
below the lower set level for
more than the set delay time.
The red LED flashes until the
delay time has expired or the
measured value comes back
within the limits. Each relay
is activated when the mea-
sured frequency comes back
within its limits.
Housing dimensions
DIN-rail versions
45 x 80 x 99.5 mm
Weight
Approx. 220 g
Screw terminals
Tightening torque
Max. 0.5 Nm
acc. to IEC 60947
Approvals
UL, CSA
CE Marking
Yes
EMC
Electromagnetic Compatibility
Immunity
According to EN 61000-6-2
Emissions
According to EN 61000-6-3
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