Eltra EL 63 Compact Hollow Shaft Encoder

Name: Eltra EL 63 Compact Hollow Shaft Encoder | Seven Star LLC
Brand: Eltra
SKU: EL 63

A six-variant hollow shaft encoder only 35 mm high for small AC motors

The EL 63 series is built for small AC motors where there is little axial room. The datasheet puts the height at only 35 mm and describes a three channel (A / B / Z) encoder with resolutions from 1 to 2500 pulses per revolution, a supply of up to 30 V DC and an output frequency of up to 300 kHz. Bore diameters of 8, 10, 12, 14 and 15 mm are available, and the shaft is fixed by collar clamping.

One datasheet covers six mechanical variants: 63FB and 63GB are blind hollow shaft, 63PB and 63PBF are through hollow shaft, and 63PC and 63PCF are rear fixing. The letters differ in how torque is reacted. The models with a G, P or PC ending include a torque pin, while FB, PBF and PCF use a torque stop slot and need the pin or bracket from the Accessories list. This gives one encoder family that can follow whichever mounting arrangement the motor already has.

Key points of the design

Hollow shaft encoders for small AC motors, only 35 mm high
Three channel output (A / B / Z) up to 2500 ppr
Supply up to +30 V DC with several electrical interfaces
Output frequency up to 300 kHz
Blind, through or rear-fixing hollow shaft up to 15 mm
Shaft fixing by collar clamping
Cable output with connectors available on the cable end

Technical specifications

Parameter	Specification
Models	63FB, 63GB (blind); 63PB, 63PBF (through); 63PC, 63PCF (rear fixing)
Resolution	1 to 2500 ppr
Supply voltage	5 version: 4.5 to 5.5 V DC; 5/28 version: 4.5 to 30 V DC with reverse polarity protection
Power draw without load	0.8 W max
Max load current	C / P 50 mA per channel; L / RS 20 mA per channel
Output circuits	NPN open collector (pull-up max +30 V DC); push-pull HTL; line driver; RS-422
Max output frequency	300 kHz
Index signal	180°e, gated A
Bore diameter	8, 10, 12, 14 or 15 mm
Enclosure rating	IP 54 (IEC 60529)
Max rotation speed	3600 rpm continuous; 4000 rpm peak
Shock / vibration	50 G, 11 ms / 10 G, 10 to 2000 Hz
Moment of inertia	4 x 10-6 kgm2
Starting torque	Below 0.04 Nm at +20°C
Materials	Bearing stage aluminum; shaft stainless steel; housing PA66 glass fibre reinforced
Bearings	2 ball bearings, life 109 revolutions
Cable	Shielded, fixed installation, 0.22 mm2, min bend radius 60 mm
Operating temperature	-10 to +60°C at the flange; no condensation
Storage temperature	-25 to +70°C
Weight	350 g
MTTFd / mission time	200 years / 20 years per EN ISO 13849-1; DC 0 %
Approvals printed	UL / CSA file E212495; EMC 2014/30/EU; RoHS 2011/65/EU

Choosing the EL 63 variant and reading the code

The datasheet example is EL 63GB 500 S 5/28 P 8 X 3 PR . XXX. Pick the model first, because it fixes how the encoder is held and how torque is reacted.

Code position	Options
63FB	Blind hollow shaft with torque stop slot; pin ordered separately
63GB	Blind hollow shaft with torque pin included
63PB	Through hollow shaft with torque pin included
63PBF	Through hollow shaft with torque stop slot
63PC / 63PCF	Rear fixing shaft with torque pin / with torque stop slot
Resolution and zero pulse	1 to 2500 ppr; S without, Z with zero pulse
Bore, enclosure, speed	8, 10, 12, 14 or 15 mm; X = IP 54; 3 = 3600 rpm
Output type	PR radial cable, 1.5 m standard; 2, 3, 5 or 10 m optional

Installation and operating notes

The datasheet recommends a g6 mating shaft tolerance and shows a recommended interface flange design for the rear-fixing 63PC. Follow it so the encoder body is located correctly on the motor end shield.

Where a torque pin is not supplied (FB, PBF, PCF), obtain it from the accessory list before installation. Tighten the collar clamp only after the encoder is seated, so that the torque arm is not preloaded.

The resolution table is long, with listed counts from 1, 2, 5 and 20 up to 2048 and 2500. Eltra marks preferred resolutions in bold in the original, which are the best stocked choices; other counts must be requested directly.

Applications for the EL 63

Small AC motors, gearmotors, textile and packaging machines and fan drives are the typical hosts, since the 35 mm height fits behind a fan cover or inside a compact motor housing. A resolution of 1 ppr and low counts are also useful for simple rotation and stall detection.

With IP 54 and a 3600 rpm rating the series is for indoor, clean and dry locations. For dusty, hot or wash-down locations choose a higher IP series from the catalogue. This is general selection guidance.

Information to send with an RFQ for the Eltra EL 63

So we can quote the right EL 63 model, send these details.

Model (FB, GB, PB, PBF, PC or PCF) and bore diameter
Resolution and index pulse requirement
Supply voltage and output circuit
Cable length and torque pin or bracket requirement

Commissioning and maintenance notes

Before installation, check that the bore matches the motor shaft and that the anti-rotation fixing does not load the bearings. Avoid hammering the encoder onto the shaft. Match the output type and supply voltage with the drive or counter input, and use shielded cable with the shield earthed as described in the manual. In hot plant rooms in the region, check the operating temperature against the real conditions near the motor, and inspect the cable and connector during routine maintenance.

When ordering a replacement, record the resolution, output type and bore of the existing encoder, so the new unit fits without changes to the drive settings.

Frequently asked questions

How tall is the EL 63?

The datasheet describes a compact size of only 35 mm height.

What bore diameters exist?

8, 10, 12, 14 and 15 mm.

What is the resolution range?

From 1 to 2500 ppr.

Is a torque pin included?

Yes for 63GB, 63PB and 63PC. For 63FB, 63PBF and 63PCF the pin is ordered from the accessories.

What speed is allowed?

3600 rpm continuous and 4000 rpm peak.

Encoders for motors, lifts and machinery

Eltra describes application areas such as industrial automation, motor feedback, lift systems, packaging, light material processing, heavy duty industry, off-highway vehicles and potentially explosive atmospheres. Hollow shaft and solid shaft designs, bore sizes from a few millimetres to 40 mm, resolutions up to 24000 ppr and enclosure ratings up to IP 67 are printed in the Eltra datasheets.

Frequently Asked Questions