Siemens 6RA70 specifications 10-29, Rev/min FS=500.0 P051 G145 1rev/min Type O4 Online 100%

PNU		Description	Value range	No. indices	See
			[Unit]	Factory	Change
			Steps	setting	(Access /
				Type	Status)
P143		Setting the maximum speed for pulse encoder operation	1.0 to 6500.0	Ind: 4	P052	= 3
FDS		The speed set in this parameter corresponds to an actual speed (K0040) of	[rev/min]	FS=500.0	P051	= 40
(G145)			0.1rev/min	Type: O4	Online
	100%.

Control parameters for speed sensing with pulse encoder P144 to P147:

P144 and P147 determine the basic setting for actual speed sensing by means of pulse encoder (single or multiple evaluation of pulse encoder signals and nominal measuring time) and thus also define the lowest possible measurable speed (minimum speed).

P145 and P146 can be used in special cases to extend the measurable speed range down to even lower speeds, on the basis of the minimum speed defined by the settings in P144 and P147.

P144	Multiple evaluation of encoder signals
*	0	1x evaluation of pulse encoder signals
FDS
	1	2x evaluation of pulse encoder signals (for encoder types 1, 1a, 2)
(G145)	2	4x evaluation of pulse encoder signals (for encoder types 1, 1a)
	Note:
	In contrast to the 1x evaluation method, 2x or 4x evaluation reduces the
	minimum measurable speed by a factor of 2 or 4 respectively, but may
	produce an "unsteady" actual speed value on encoders with unequal
	pulse/pause ratio or without an exact 90° displacement between encoder
	signals.
P145	Automatic measuring range switchover for measurement of low

*speeds - switchover of multiple evaluation

FDS	0	Automatic switchover of multiple evaluation of pulse encoder
(G145)		signals OFF (i.e. P144 is always active)
	1	Automatic switchover of multiple evaluation of pulse encoder
		signals ON (i.e. when P144 = 0, 2x evaluation is selected for low
		speeds and 4x evaluation for very low speeds. When P144 = 1,
		4x evaluation is selected for low speeds)
		As opposed to P145 = 0, this setting reduces the minimum
		measurable speed by up to a factor of 4.
	Caution:
	Switching over the multiple evaluation method for encoder pulses also
	affects the position sensing function in the measuring channel. For this
	reason, this setting may not be used in conjunction with positioning
	operations. Connectors K0042 to K0044 are inoperative when P145 = 1.
P146	Automatic measuring range switchover for measurement of low

*speeds - switchover of measuring time

FDS	0	Automatic switchover of measuring time OFF
(G145)		(i.e. P147 is always active)
	1	Automatic switchover of measuring time ON
		This setting extends the measuring time for low speeds (based
		on the measuring time set in P147, i.e. when P147 = 0, the
		nominal measuring time is switched over to 2 ms for low speeds
		and to 4 ms for very low speeds. When P147 = 1, the nominal
		measuring time is switched over to 4 ms for low speeds)

Caution:

When P146=1, the minimum measurable speed can be reduced by up to a factor of 4 as opposed to a 0 setting. However, this setting results in a longer actual speed sensing delay in the extended minimum speed range.

0 to 2

1

0 to 1

1

0 to 1

1

Ind: 4	P052	= 3
FS=2	P051	= 40
Type: O2	Offline

Ind: 4	P052	= 3
FS=0	P051	= 40
Type: O2	Offline

Ind: 4	P052	= 3
FS=0	P051	= 40
Type: O2	Offline

SIEMENS Energy & Automation	10-29
SIMOREG DC Master Base Drive Panel Operating Instructions