Elscint has got three models of its Frequency Controllers, namely, EFQC6, EFQC4.5, EFQC3 & EFQC1.5. EFQC6 is suitable for large vibratory bowl feeders having VA rating of more than 1500 VA while EFQC4.5 is for smaller vibratory bowl feeders having VA Rating of upto 990 VA. EFQC3 is for vibrators of 380 VA Rating while very small vibrators upto 200 VA require EFQC1.5 Main features of these Frequency Controllers are –
- Frequency Adjustment – The major advantage of using a frequency controller is that one can adjust the output frequency of the controller to get the best resonant frequency at which vibratory feeder works best, eliminating the need for manually tuning the vibratory feeder.
- Automatic Voltage Regulation – This feature helps to eliminate the speed variation caused due to mains voltage fluctuation.
- Automatic Frequency Adjustment – In case the input frequency changes (due to genset operation), the output frequency remains the same at the preset level.
- Maximum Output Voltage Adjustment – This provision helps to adjust the maximum output voltage, which in turn reduces chances of damage to a vibratory feeder.
- Overheat Protection – If the internal voltage in the controller increases, it switches off.
- Overload cut-off – In case the vibrator current increases its rated value, there is a provision of overload cut-off
- Provision of 1 sensor output is available in all these controllers
- Provision of remote control (through PLC) is available except for EFQC1.5
The technical specifications of these Frequency Controllers are given in the below chart –
| Particulars | EFQC1.5 | EFQC3 | EFQC4.5 | EFQC6 |
| Input Voltage Range | 220 V AC | 220 V AC | 220 V AC | 220 V AC |
| Output Voltage Range | 0 V to 260 V | 0 V to 260 V | 0 V to 240 V | 0 V to 260 V |
| Output Frequency | 40 Hz to 180 Hz | 40 Hz to 180 Hz | 5 Hz to 180 Hz | 40 Hz to 180 Hz |
| Vibrator VA Rating | Upto 200 VA | 550 VA | 990 VA | 3000 VA |
| Voltage Adjustment
Accuracy |
1 V | 1 V | 1 V | 1 V |
| Frequency Adjustment
Accuracy |
0.1 Hz | 0.1 Hz | 0.1 Hz | 0.1 Hz |
| On / Off Delay – 2 sensors | 0 to 20 sec | 0 to 20 sec | 0 to 20 sec | 0 to 20 sec |
| PLC Control | Start Stoppossible
from PLC |
Variation of
speed through PLC possible with 0/10V-0/20mA input |
Variation of
speed through PLC possible with 0/10V-0/20mA input |
Variation of
speed through PLC possible with 0/10V-0/20mA input |
| Soft Stop Provision | Available | Available | Available | Available |
| Locking provision | Possible | Possible | Possible | Possible |
| Sensor | PNP | PNP | PNP | PNP |
| Amplitude Sensor
|
Not Possible in normal version but Version with Amplitude Sensor is available | |||
| Soft Start time | 0 to 10 sec | 0 to 10 sec | 0 to 10 sec | 0 to 10 sec |
| Display | Digital LED | Digital LED | Digital LED | Digital LED |
Thus, the major advantages of using a Elscint Frequency Controller are –
- No variation in case of input frequency change (genset working)
- Mechanical Adjustment of the Vibratory Bowl Feeder / Linear Vibrator is not required
- The resonance frequency once determined remains stored even after the loss of power
- No need to change the coils / springs / vibrator in case of 50 Hz and 60 Hz input
- No variation in case of input voltage fluctuation
- It is Short Circuit Proof
- There being no Potentiometer on the Controller (there are up / down buttons), changes of any misuse is eliminated. Locking arrangement possible.