Emotron CDU/CDX 48-026 [23/82] Setting encoder devices and number of pulses

EMOTRON DSV 5445/5444

21.04.09  Emotron

Page 23

5.2 Setting encoder devices and number of pulses

Encoder type Memory cell 0E4A Memory cell 0E3E Jumper JP3

1024 pulses 1Vpp 1024 000 top

1024 pulses TTL 1024 255 bottom

1024 pulses HTL 1024 255 centre

2000 pulses TTL 2000 255 bottom

2048 pulses 1Vpp 2048 000 top

2048 pulses TTL 2048 255 bottom

2500 pulses TTL 2500 255 bottom

2500 pulses HTL 2500 255 centre

4096 pulses TTL 4096 255 bottom

500 pulses TTL 500 255 bottom

preferred version "normal winch" preferred version "gearless winch"

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A calculation overflow can sometimes occur for encoder pulse numbers above 2500 pulses after

performing the function "Save values" using the internal, external FU-Control. The internal FU-

Control displays: "Parameter control off"; while the external displays: "Ready for operation?". In

this case, set parameter F24 to value "1" under menu item "Change parameters". The device is

ready for operation again after "Save values" has been performed.

The same can also apply to the rare suspension "4:1".

The devices are normally already prepared for the corresponding project ex-works. Therefore

check the rating plate before you load the new .UPD or .KOM programs to see whether your

project has already been taken into account.

You can call our application department if you have questions related to the base setting.

5.3 Encoder technology

5.3.1 1Vpp 4-channel sine/cosine

The 1Vpp sine/cosine encoder (e.g. 1024 cycles) represents the most modern encoder system available

today. The additional internal multiplication (64-times analogue sampling) represents, for example, an

effective 131,072 increments per motor shaft revolution. This high resolution is necessary especially for a

smooth ride, since no discrete control steps (jumps between the flanks and dead times) can occur. This

applies especially to the slow running "gearless" drives.

The system furthermore offers perfect monitoring in the event of cable breakage and encoder faults by

evaluating the four individual 1Vpp channels in the DSV 544x system.

5.3.1.1 Absolute value encoder with 1Vpp 4-channel sine/cosine and analogue resolver systems

The rotor displacement angle RHO is necessary for the operation of synchronous motors so that the

converter always feeds the stator rotating field in an optimal manner for the position of the permanently

magnetised rotor in the corresponding motor phases. A single turn position is therefore notified to the device

with the help of an additional option board. Such systems are explained in the annex using examples of

various winches with synchronous motors.