Overspeed switch is suitable for measuring the speed of high-speed shaft and low-speed shaft of wind turbines and providing protection when high-speed shaft and/or low-speed shaft is overspeed . The switch is used to monitor the signals emitted by NPN or PNP proximity switch to achieve its functions. Has two independent pulse signal processing channels, each channel with its own signal processing flow that does not affect each other. When the input signal frequency exceeds the set value, the switch will output a hardware alarm signal, thus realizing the overspeed protection for the wind turbine generator, The switch adopts two types of signal output: 4-20mA analog and PNP pulse signal, which is convenient for the control system to collect the rotational speed signal.

The signal processing method of the switch adopts algorithms such as pulse width suppression and sliding window mean filtering, which can effectively filter all kinds of interference signals. The alarm determination mechanism has alarm delay and alarm latch functions.

The switch has coded switches which are utilized to set parameters such as alarm frequency points and current output fullness values. Furthermore, the switches can be updated the program through RS485.
 

FS231 Overspeed Switch

Supply Voltage
Supply Power
Driving Capability of Output
Working Temperature
Storage Temperature
Ambient Humidity
Storage Humidity
Altitude
Protection Class
EMC

Installation
Housing Material
Size
Weight

DC24V (18V ~ 30V)
3W
DC24V (18V ~ 30V) / 500mA
-40°C to +80°C
-45°C to +85°C
≤ 95%RH, No condensation
20% ~ 75%RH
≤ 5000m
IP40
IEC 61000-4-2 (level 3)
IEC 61000-4-4 (level 3)
IEC 61000-4-5 (level 3)
35mm rail mounting
aluminium alloy
106 × 55 × 103 mm
≤0.5kg
 

☼  General Parameters

Input Signal
Measurement Error
Measurement Accuracy
Alarm Trigger Frequency
Recovery Frequency Of Alarm
Output Signal
Output Current
Maximum Load Resistance
Accuracy Of Output Current Transmission
Shock Capacity Of Relay
On-resistance Of Relay

☼  Performance Parameter

NPN proximity switch / PNP proximity switch
0.1 ~ 99.9Hz or 1 ~ 999Hz
±0.1%
>FSET
<0.95FSET
PNP
4 ~ 20mA
900Ω
±0.5%
6A 250Vac/30Vdc
<0.2Ω