SFW-7 Voltage Frequency Guard
with protective functions according to DIN V VDE V 0126-1-1 & DIN VDE-AR-N-4105:2011-08 and monitoring of rate of change of frequency ( ROCOF - Δf to Δt )
The SFW-7 is a device for the monitoring of a three-phase mains system on frequency, voltage, phase sequence, angular shift, rate of change of frequency (ROCOF - requires firmware V1.09 or later) and vector surge. Measurement can be done either with or without neutral conductor.
A separate frequency measuring is available for each of the 3 phases. Detection of vector surge can be assigned to a single phase or all phases. Trigger values are stored & the last 38 triggering events may be retrieved from the device at least. Due to a special internal wiring, the loss of the neutral conductor can be detected in a 3-wire + N - system. The monitoring on nominal voltage and frequency in accordance to DIN V VDE 0126-1-1 (requires firmware version V1.04 or later) & / or DIN VDE-AR-N-4105:2011-08 (requires firmware version V1.09 or later) can be enabled by setting of the corresponding parameters.
Microcontroller- and PC database technology of the SFW-7 provide the conveniently configuration of all settings, using our para- meterisation software 'device manager' (GV_2.exe - Version V2.31 or later recommended). Alternatively values, but not texts, can be entered directly at the device. The input to the device can be protected by use of a PIN. The output of display-texts takes place in 2 languages, default is German and English (switching between languages is possible during operation). Alternative langua- ges can be configured and conveniently made available, by means of our parameterisation software 'device management'.
Note: A separate variant of the SFW-7 is available for measuring voltages ≤ 100 V.
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Technical data |
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|---|---|
| Auxiliary Voltage | 24V DC (18 ... 36 V) optionally 230V AC / 12 V DC |
| Power consumption | approx. 4 W at 24 V DC, approx. 6 VA at 230 V AC |
| Digital Inputs | LowActive (Contact Voltage 12 V, 5 mA, opto-decoupled), cables no longer than 3 m |
| Relay outputs | 230 V / 50 Hz / 2 A (potential-free) |
| Analogue Outputs | 0 ... 10 V +/- 0.05 V max. 10,5 V |
| Measuring Range | approx. 50 up to 230 / 400 V, tolerance < 0,5 % of full scale ( 270 / 480 V ) |
| Frequency Measurement | 35.0 Hz up to 65.0 Hz from approx. 60 V L-N on adjustable in 0.1 Hz steps repeatability +/- 0.05 Hz |
| Ambient temperature | -20 ... +55 ºC |
| Housing Dimensions | W / H / D 100 x 75 x 110 mm DIN top-hat rail mounting 35 mm |
| Download PDF |  Data sheet |
 Description |
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| Ordering information | SFW-7 / 400 V / 24V DC: E2085 SFW-7 / 400 V / 230V AC: E2086 SFW-7 / 100 V / 24V DC: E1573 SFW-7 / 100 V / 230V AC: E1574 |