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Powering down and disconnecting the HS20
To disconnect power to the HS20, first turn off the 24 V DC power supply, then unplug the HS20
interface connectors or disconnect the 24 V input connector.
Ensure that the connectors on the rear of the HS20 are accessible by the operator.
Power requirements
The HS20 requires a 24 V power supply conforming to the following specification.
24 V DC ± 1 V @ 2.0 A
24 V DC ± 1 V @ 1.2 A
24 V DC ± 1 V @ 0.7 A
The 24 V power supply should be single fault tolerant certified to EN (IEC) 60950-1.
Output quadrature format
The HS20 can output digital quadrature signals in two-channel A quad B format, A and B signals
having a 90° phase shift in RS485 format.
Analogue quadrature - 1V analogue interface
The HS20 outputs analogue quadrature sin/cos signals with a period of 316nm.
The analogue quadrature signals are 1V peak to peak signals (at 100% signal strength) when
terminated with 120Ω resistors.
Inrush (first 10 ms)
Warm-up (~10 mins)
Operation at room temperature (20 ºC)
Figure 29 - Digital quadrature format
90°
Cosine
Sine
Figure 30 - Analogue (Sin/Cos) waveforms
SINE (& COSINE)
120 R
SINE (& COSINE)
1 Vpp
2.5 V DC offset
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