Siemens SIMOTRAS 6SG7050 Operating Instructions Manual page 367

01.04
PNU Description
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:
/ min] =
n [ U 21973
min
The following applies:
X = 1 for 1x evaluation of pulse encoder signals (P144=0)
2 for 2x evaluation of pulse encoder signals (P144=1)
4 for 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:
18000000
/ min] =
n [ U
max
P
When selecting a pulse encoder, therefore, it is important to ensure that the lowest possible speed ≠ 0 is significantly higher than n
and the highest possible speed does not exceed n
21973
>>
IM
∗
X n [ U / min]
min
18000000
≤
IM
n [ U / min]
max
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
P140 Selection of pulse encoder type
* See beginning of this Section for pulse encoder types
0 No encoder/"Speed sensing with pulse encoder" function not
selected
(G145)
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
(G145)
P142 Matching to pulse encoder signal voltage
* 0 Pulse encoder outputs 5 V signals
1 Pulse encoder outputs 15V signals
(G145)
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
must be provided for pulse encoders requiring a 5V supply.
SIEMENS AG 6SG7000-0BA76
SIMOTRAS HD Operating Instructions
1
∗
Formula applies with a nominal measuring time of 1 ms when P146=0 and P147=0
∗
X P 141
141
.
max
Equations for selection of pulses per revolution IM of pulse encoder
Value range No. indices
[Unit]
0 to 4 Ind: None
1 FS=1
Type: O2
1 to 32767 Ind: None
[pulses/rev] FS=250
1 pulse/rev Type: O2
0 to 1 Ind: None
1 FS=1
Type: O2
Parameter list
See
Change
min
P052 = 3
P051 = 40
Offline
P052 = 3
P051 = 40
Offline
P052 = 3
P051 = 40
Offline
11-19