Siemens 440 manual R0403 CO/BO Encoder status word, P04083 Encoder pulses per revolution

Parameter Description Issue 01/06

r0403	CO/BO: Encoder status word		Min:	-
	Datatype: U16	Unit: -	Def:	-
	P-Group: COMMANDS		Max:	-

Displays status word of encoder (in bit format).

Bitfields:
Bit00	Encoder module active	0	NO	1	YES
Bit01	Encoder error	0	NO	1	YES
Bit02	Signal o.k.	0	NO	1	YES
Bit03	Encoder low speed loss	0	NO	1	YES
Bit04	HW timer used	0	NO	1	YES

Details:

See description of seven-segment display given in the "Introduction to MICROMASTER System Parameters" in this manual.

Level

2

P0408[3] Encoder pulses per revolution					Min:	2	Level
	CStat:	CT	Datatype: U16	Unit: -	Def:	1024	2
	P-Group:	ENCODER	Active: Immediately	QuickComm.: No	Max:	20000

Specifies the number of encoder pulses per revolution.

Index:

P0408[0] : 1st. Drive data set (DDS)

P0408[1] : 2nd. Drive data set (DDS)

P0408[2] : 3rd. Drive data set (DDS)

Note:

The encoder resolution (pulses per revolution P0408) which may be entered will be limited by the max. pulse frequency of the encoder option board (f_max = 300 kHz).

The following equation calculates the encoder frequency depending on the encoder resoulution and the rotational speed (rpm). The encoder frequency has to be less than the max. pulse frequency:

fmax > f =	p0408 x rpm
	60

P0491[3] Reaction on freq. signal loss					Min:	0	Level
	CStat:	CT	Datatype: U16	Unit: -	Def:	0	2
	P-Group:	ENCODER	Active: first confirm	QuickComm.: No	Max:	1
	Selects reaction on loss of frequency signal.
Possible Settings:
	0 Do not change to SLVC
	1 Change to SLVC
Index:
	P0491[0]	: 1st. Drive data set (DDS)
	P0491[1]	: 2nd. Drive data set (DDS)
	P0491[2]	: 3rd. Drive data set (DDS)
P0492[3] Allowed frequency difference					Min:	0.00	Level
	CStat:	CT	Datatype: Float	Unit: Hz	Def:	10.00	2
	P-Group:	ENCODER	Active: Immediately	QuickComm.: No	Max:	100.00

Parameter P0492 is used for low and high frequency encoder loss detection (fault: F0090).

1.High frequency encoder loss detection:

This condition occurs when the allowed frequency and the allowed difference of the frequency signals between samples, set in P0492 is exceeded.

Condition:

-Act. freq. > P0492 and f(t_2) - f(t_1) > P0492

2.Low frequency encoder loss detection:

This condition occurs when the actual frequency is < P0492 when encoder loss occurs. Condition a):

-r0061 = 0 and torque limit and then

-r0061 = 0 with setpoint frequency > 0 for time > P0494

or

Condition b):

-Act. freq. < P0492 and f (t_2) < P0492 and ASIC detect channel B loss

Dependency:

This parameter is updated when motor start-up time P0345 is changed or when a frequency-loop optimisation is performed (P1960 = 1). There is a fixed delay of 40 ms before acting upon loss of encoder at high frequencies.

Caution:

P0492 = 0 (disabled):

When allowed frequency difference is set to 0, both the high frequency and low frequency encoder loss detection is disabled, thus encoder loss will not be detected.

	If encoder loss detection is disabled and encoder loss occurs, then operation of the motor may become
	unstable.
68	MICROMASTER 440 Parameter List
	6SE6400-5BB00-0BP0