Siemens 6RA70 specifications 10-28, Single/multiple evaluation of encoder pulses

PNU	Description	Value range	No. indices	See
		[Unit]	Factory	Change
		Steps	setting	(Access /
			Type	Status)

Notes on selecting a pulse encoder (number of pulses):

The lowest speed which can be measured by a pulse encoder is calculated with the following equation:

n min[ rev / min]=21973∗ 1

X ∗P141

Formula applies with a nominal measuring time of 1 ms when P146=0 and P147=0

The following applies:

X = 1 for 1x evaluation of pulse encoder signals (P144=0)

2for 2x evaluation of pulse encoder signals (P144=1)

4for 4x evaluation of pulse encoder signals (P144=2) see also ”Single/multiple evaluation of encoder pulses”

Lower speeds are interpreted as n=0.

The frequency of the pulse encoder signals at terminals 28 and 29 or 30 and 31 must not be higher than 300 kHz. The highest speed which can be measured by a pulse encoder is calculated with the following equation:

n max[ rev / min]=18000000 P141

When selecting a pulse encoder, therefore, it is important to ensure that the lowest possible speed ≠ 0 is significantly higher than nmin and the highest possible speed does not exceed nmax.

IM>> 21973

X ∗n min[ rev / min]

IM≤ 18000000 n max[ rev / min]

Equations for selection of pulses per revolution IM of pulse encoder

Single/multiple evaluation of encoder pulses:

The setting for single/multiple evaluation of encoder pulses is applicable for both the speed and position sensing functions.

1x evaluation:		Only the rising edges of one pulse track are evaluated (applies to all encoder types).
2x evaluation:		The rising and falling edges of one pulse track are evaluated (can be set for encoder types 1, 1a and 2).
4x evaluation:		The rising and falling edges of both pulse tracks are evaluated (can be set for encoder types 1 and 1a)
See parameters P450 and P451 for position sensing function
			0 to 4
P140	Selection of pulse encoder type			Ind: None	P052	= 3
	See beginning of this Section (11.8) for pulse encoder types		1	FS=0	P051	= 40
(G145)				Type: O2	Offline
	0	No encoder/"Speed sensing with pulse encoder" function not
		selected
	1	Pulse encoder type 1
	2	Pulse encoder type 1a
	3	Pulse encoder type 2
	4	Pulse encoder type 3
P141	Number of pulses of pulse encoder		1 to 32767	Ind: None	P052	= 3
			[pulses/rev]	FS=500	P051	= 40
(G145)			1 pulse/rev	Type: O2	Offline
P142	Matching to pulse encoder signal voltage		0 to 1	Ind: None	P052	= 3
	0	Pulse encoder outputs 5 V signals	1	FS=1	P051	= 40
(G145)				Type: O2	Offline
	1	Pulse encoder outputs 15V signals

Matching of internal operating points to signal voltage of incoming pulse encoder signals.

CAUTION

Resetting parameter P142 to the alternative setting does not switch over the supply voltage for the pulse encoder (terminals X173.26 and 27). Terminal X173.26 always supplies +15V. An external voltage supply is must be provided for pulse encoders requiring a 5V supply.

10-28	SIEMENS Energy & Automation
	SIMOREG DC Master Base Drive Panel Operating Instructions