Current and Voltage Controls
Frequency Monitoring Control
Type EFA
• 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
EFA C 230
EFA is monitoring the fre- the user many application Housing
quency of an AC power sup- possibilities e.g. in connec- Function
ply with the possibility of sepa- tion with wind-driven genera- Type
rate adjustment of upper/ tors or similar equipment.
lower limits. This relay offers
Output
Power supply
Type Selection
Mounting
Output
Measuring range
Supply: 24 VAC
EFA C 024
Supply: 115 VAC
EFA C 115
Supply: 230 VAC
EFA C 230
For DIN-rail
2 x SPDT
50-60 Hz
Input Specifications
Output Specifications
Input
Output
Rated insulation voltage
Contact ratings (AgCdO)
Resistive loads
DC 1 5 A, 24 VDC
Small inductive loads AC 15 2 A, 250 VAC
DC 13 3 A, 24 VDC
2 x SPDT relay
Through terminals A1 & A2
Measuring on own power
supply
250 VAC (contact/elect.)
µ (micro gap)
AC 1 5 A, 250 VAC
Measuring range
Bandwidth selectable by
2 separate rotary switches
Upper level
Lower level
0.5 Hz
1.0 Hz
1.5 Hz
2.0 Hz
2.5 Hz
3.0 Hz
4.0 Hz
5.0 Hz
6.0 Hz
10.0 Hz
0.5 Hz
1.0 Hz
1.5 Hz
2.0 Hz
2.5 Hz
3.0 Hz
4.0 Hz
5.0 Hz
6.0 Hz
10.0 Hz
Mechanical life
Electrical life
≥ 40 x 106 operations
≥ 105 operations
(at max load)
Operating frequency
Dielectric strength
Dielectric voltage
≤ 7200 operations/h
2 kVAC (rms)
Rated impulse withstand volt. 4 kV (1.2/50 µs)
Supply Specifications
Power supply
Overvoltage cat. III (IEC 60664)
(IEC 60038)
24 VAC ±15%, 40 to 70 Hz
115 VAC ±15%, 40 to 70 Hz
230 VAC ±15%, 40 to 70 Hz
≤ 40 ms
Rated operational voltage
Through pins A1 & A2 024
115
230
Voltage interruption
Dielectric voltage
Rated impulse withstand
voltage
≥ 2 kVAC (rms)
4 kV (1.2/50 µs)
3 VA
Rated operational power
Specifications are subject to change without notice (26.10.99)
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