Protector trip relay - Crompton Instruments - 250 Series - Speed Sensing

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Protector trip relay - Crompton Instruments - 250 Series - Speed Sensing

 

Features

- 1mA analogue output
- 3 adjustable set points
- Adjustable time delay
- Internal differential
- LED trip indication
- Automatic reset
- Three single-pole relays
- Magnetic pick up input
 

Benefits

- Under/over-speed monitoring
- Speed indicator output signal
- Zero reset cranking
- Nuisance tripping avoidance
- Customised options
 

Applications

- Marine panels
- Switchgear
- Distribution systems
- Generator sets
 

Operation

The speed sensing protector monitors the speed of rotation using a low cost magnetic pickup. Speed sensors are often used in generator set engines, gas turbines, motors, gear boxes or any rotating machines. The relay will detect under-speed, over-speed and stopped conditions and the set point relays can be used to raise an alarm or shut down the equipment. The relay provides three user adjustable trip levels with LED relay state indication and a speed indicator output signal.

The product also offers an analogue output that can be used to monitor or display the speed. The product operates from the 12V or 24V dc battery supply and speed is measured and calculated from the number of sensor pulses per revolution. Since the sensor is magnetic, a rotating steel component such as the flywheel which has gear teeth can be used. This will result in a large number of pulses per revolution and lead to greater accuracy.

The protector continuously monitors the rotation speed and updates the analogue output signal. An output of 0.75mA indicates normal speed (100%) while 1mA indicates 133% of nominal speed. The calibration point can easily be user adjusted. Three set point control adjustments allow setting of the desired speed limits for cranking, under-speed and over-speed.
 

Cranking Relay

The cranking relay detects if the engine is running or stopped. This relay can be used to ensure the cranking motor is disconnected once the engine has started running. Set the cranking set point just above the cranking motor speed. A red LED illuminates when the relay is energised, indicating a trip condition. The crank relay will only reset when the input frequency falls below 20% of the crank set point.
 

Under-Speed Relay

The under-speed relay detects when the normal running speed has been achieved. This can be used to enable the generator's electrical protection. It can also be used to trigger load shedding. A red LED illuminates when an under-speed condition exists.
 

Over-Speed Relay

The overs-speed relay detects a stuck throttle or overshoot. A break in the sensor load will de-energise the over-speed relay and can be used to shut down the engine. A red LED indicates over-speed trip.
 

Fail Safe Operation

The relay will detect an open circuit speed sensor and de-energise the overspeed relay.
 

Product Codes

Relay	Protection	ANSI no.	Cat. no.
Speed sensing	Crank 10 to 50%	12/14	253-PH3
	Under-speed 50 to 100%
	Over-speed 100 to 130%

When ordering please supply the following information:
- The number of pulses per revolution, e.g. flywheel teeth = 30.
- The nominal running speed, e.g. 3600 RPM.
- The dc battery supply, e.g. 24V dc.

The protector speed sensing relay provides three user adjustable trip levels with LED relay state indication and a speed indicator output signal. Please specify:
- SP1 – disengages the crank starter.
- SP2 – energises protection or under-speed alarm.
- SP3 – alarms or trips on over-speed.
 

Specification – Speed Sensing

Pulse input (magnetic input)	5V – 75V peak to peak
Frequency input	0-1 to 0-10kHz
Overload	1.2 x rating continuously
Set point repeatability	>0.5% of full span
Differential (hysteresis)	Pre-set at 2% (SP1 version resets at 20% of setting)
Trip level adjustment	SP1 (crank): 10 to 50%
	SP2 (under-speed): 50 to 100%
	SP3 (over-speed): 100 to 130%
DC auxiliary supply voltage	12V or 24V ±20%
Auxiliary voltage burden	3VA (max)
Analogue output	0.75mA for normal 100% speed
	1mA for 133% of nominal speed
Calibration signal	0-1mA into 0-1000Ω
Output relay	3 1-pole change over relays
Relay contact rating	AC: 240V 5A non inductive
	DC: 24V 5A resistive
Relay mechanical life	life 0.2 million operations at rated loads
Relay reset	Automatic
Operating temperature	0°C to +60°C (0°C to +40°C for UL models)
Storage temperature	–20°C to +70°C
Temperature co-efficient	0.05% per °C
Interference immunity	Electrical stress surge withstand and non-function to ANSI/IEEE C37 90a
Enclosure style	DIN-rail with wall mounting facility
Material	Flame retardant polycarbonate/ABS
Enclosure integrity	IP50
Model	253 dimensions 75mm (2.9") wide x 70mm (2.8") high x 112mm (4.4") deep

 

Connections

253-PH3


Hình: Connection 253-PH3

 

Dimensions

Model 253


Hình: Kích thước model 253



 

Danh mục sản phẩm

System	Protect	DC Aux Power	Catalog Number
Speed Sensing
5V to 75V peak to peak	3 Trip Points	12 VDC	253-PH3U-BGBX-FS-V2
	3 Trip Points	24 VDC	253-PH3U-BGBX-FS-V4