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Application : |
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The Rishabh Speed Sensing Relay provides three user adjustable trip levels with LED relay state indication and a speed indicator output signal.
The trip functions provided are :
SP1- disengages the crank starter
SP2-energises protection or under-speed alarm
SP3- alarms or trips on over speed
The unit also incorporates the following protection features :- |
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Open circuit sensor detection - a break in the sensor lead will de
energise the over-speed relay. |
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Zero reset cranking - the crank relay will only re-set when the input
frequency falls below 20% of the crank set point. |
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Specifications : |
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| Input : |
| Pulse |
5V-75V peak to peak |
| Frequency |
0-1kHz min. range/0-10kHz max. Range
(Speed of rotation = r.p.m x number of teeth/60) |
| Open circuit Protection |
Over speed relay de-energises |
| Set point : |
| Set point SP1(crank) |
10% - 50% |
| Set point SP2(under) |
50% - 100% |
| Set point SP3(over) |
100% - 130% |
| Repeatability |
0.5% of span |
| Hysteresis |
SP1 resets at 20% of setting
SP2, SP3 at 2% of setting |
| Output Relay : |
| Type |
SP changeover |
| Rating A.C |
240V,5A non-inductive |
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View chart |
| Operations |
0.2 million at the above load |
| Reset |
Automatic |
| Auxiliary Supply : |
| D.C. Voltage |
12V or 24V (±20%) |
| Burden |
3 VA |
| Weight |
0.6Kg |
| Output : |
| Calibration Signal |
0-1mA into 0-1,000 W |
| Calibration Value |
0.75 mA = 100% *
1mA = 133% of nominal speed |
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* Note : This must be adjusted to 0.75mA to ensure the trip levels are set to the calibrated values. |
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** There is no need to fit a meter to terminals 15 & 16. The sensing pick-up must be an unpowered inductive coil (not a powered proximity switch). |
