motor encoder KN40 NPN signal for ABZ phase, line driver output for UVW phase
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Product introduction for KN40 hollow shaft encoder
|Encoder type||Incremental encoder|
|Installation dimension||R17mm, R20mm;R23mm|
|Hollow shaft type||blind hole; through hole, taper hole,solid taper shaft|
|Solid shaft diameter||10mm (taper shape)|
|Hollow shaft diameter||6mm;8mm;9mm;9.52mm;10mm|
|Output phase||Phase A+,B+,Z+,A-,B-,Z-,U+,V+,W+,U-,V-,W-|
|Supply voltage||DC5V ; DC8--30V|
|Outlet type||Cable out from side|
|Output mode||NPN/PNP(Open Collector Output)|
|line drive (26LS31) TTL|
|line drive(DC8-30V) HTL|
|TTL(DC5V) phase ABZ are back of phase UVW|
|Shell Material||die cast aluminum|
|Net weight||About 90g (with package)|
Principle of encoder
Today most incremental encoders have a Push-Pull (HTL) or RS422 (TTL) output driver, these have replaced most of the older output circuits like Open Collector NPN, Open Collector PNP, Voltage Output.
Push-Pull (HTL) circuits, also known as Totem Pole, provide a signal level which corresponds to the applied supply voltage. The supply voltage typically ranges from 8 to 30 VDC.
With proper connections you can use the Push Pull interface to replace true open collector circuits by using an external diode connected in a way to limit the direction of the current for RS422 (TTL) circuits provide a constant 5 V signal level that is not dependent on the supply voltage. Two supply voltage ranges can be selected: From 4.75 to 5.5 VDC (can be used to replace open collector output drivers) or from 8 to 30 VDC. Using differential signals the output fully complies to the RS422 standard.
The differential outputs have the highest frequency response capability and the best noise immunity. To ensure this the receiver should also be a differential.
Replacement of Older Output Drivers
Factory Encoder Production Capability
5000 pieces per month
-------- Production Line Capacity
50000 pieces per year
--------Actual Units Produced (Previous Year)
About Encoder Vibration
Vibration acting on an encoder always cause wrong pulse easily.
So we have to pay more attention to encoder working place.
The more pulse per round, the narrower groovy spacing of grating, ore effect to encoder by vibration, when motor speed is low or even stopped, vibration acting on encoder shaft or encoder shell would cause grating vibration, in this way, encoder might show wrong pulse signal.