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

Page 68
Image 68
Siemens 440 R0403 CO/BO Encoder status word, P04083 Encoder pulses per revolution, P04913 Reaction on freq. signal loss