Moog MSD Servo Drive Series User Manual

treatedasrotarySSIencoders(inthiscase,itisimpossibletodeterminethat
thesystemisalinearencodersystembasedontheencoderhead).Likewise,
linearSin/Cosencoderswithoutanabsolutevalueinterfacearetreatedas
“rotary”encoders(ifrunascommutationencoders,thenumberoftracks, or
lines (Lines)andtheencodergearing(Num,Denom)mustbeusedtoestablish
therelationshiptothelinearmotor’smagn.polepairsubdivision).Onlyinthe
caseofSin/Cosencoderswithdistance-codedreferencemarkswillthesystem
determine,basedonPeriodLen>0,thattheencodersystemislinearandnot
rotary.
 P 580[0] - ENC_CH3_Info=EncoderInformation
Thisparameterisavailabletotheusersothattheycanenteratextoftheir
choice(maximum31characters).Thistextshouldbeusedtodescribethe
encoderonchannelCh3

P 636[0] - ENC_CH3_CycleCount=Samplingcyclein:nx125µs
(microseconds)
TheCycleCountparametercanbeusedtoslowdownthetimingforthe
cyclicalSSIencoderevaluation.Bydefault,CycleCount=1,i.e.thedefault
settingcorrespondsto125µssamplingandcyclesfortheencoder
evaluation.Differentsettingsmustbeviewedasspecialcasesand
accordinglymustonlybeusedwhennecessary(see Section"SSI
(cyclical)X8"onpage85).

P 630[0] - ENC_CH3_NominalIncrementA=distancecodedabsolute
encoder
P 631[0] - ENC_CH3_NominalIncrementB=distancecodedabsolute
encoder
TheNominalIncrementAandNominalIncrementBparametersmakeit
possibletorunSin/Cosincrementalencoders(withoutanabsolutevalue
interface)withanalogdistance-codedreferencemarks.Forexample,ifyou
wereusingtheHeidenhainROD280Cwith18000Sin/Cospulsesper
revolutionand36distance-codedreferencemarks,youwouldneedtoset
NominalIncrementAto1000signalperiodsandNominalIncrementBto1001
signalperiods.ThisfunctionalityisenabledifNominalIncrementA>0(see
Section "Distance-codedreferencemarks"onpage101).
 P 637[0] - ENC_CH3_AbsInitMode=Modeabsolutevalueformation
AbsInitModecanbeusedtoselectvariouspossiblesettingsfortheabsolute
MOOG
ID
No.: CB40859-001 Date: 02/2018
MSD Servo Drive- Device Help
84
6 Encoder
valueinitialization:
o
DIG_ANA(0)-Standard:
Absolutevalueinitializationusingamixofthedigitalandanalog
components(thisisthedefaultmode)
o
DIG(1)-Digital:
Onlythedigitalcomponentwillbeusedfortheabsolutevalue
initialization.
o
SEK_SEL37(2)-Automatic:
DigitalifSTbits>(LineBits+8);otherwisestandard
o
SSI_180(3)-SameasStandard,except:
InthecaseofSSI,thequadrantalignmentofthedigitalvaluerelative
totheanalogSin/CoslinesisnotthesameaswithEnDat,butis
insteadoffsetby180degreesrelativetoEnDat,i.e.inthe“naturalQ
alignment”forthedigitalvaluerelativetothetracks.
6.7.5.2.5SSIabsolutevalueinterface
If P570[0] - ENC_CH3_Abs = SSI(1), which is the normal setting, the absolute SSI
encoder position will be read once during the initialization phase; after this, the
cyclical encoder position will be acquired based on the Sin/Cos incremental
component.
The parameters for the SSI interface are described in Section "SSI (cyclical) X8" on
page 85, as are the differences in using the SSI interface with the “cyclical” method
and “one-time reading” method.
6.7.5.2.6EnDatabsolutevalueinterface
If P570[0] - ENC_CH3_Abs = ENDAT(2), the absolute EnDat encoder position will
be read once during the initialization phase; after this, the cyclical encoder position
will be acquired based on the Sin/Cos incremental component.

Moog MSD Servo Drive Series Specifications

General

Brand	Moog
Model	MSD Servo Drive Series
Category	DC Drives
Language	English