SEW-Eurodrive MOVIDRIVE compact MCH41A, System Manual

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System Manual – MOVIDRIVE® compact Drive Inverters
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Explanation of the parameters
Parameters
P944 Encoder
scaling ext.
encoder Setting range: x1 / x2 / x4 / x8 / x16 / x32 / x64
Before setting P944, make sure that P942 and P943 are set to "1".
The significance of the travel resolution of the motor encoder and external encoder is
adapted. The parameter is set so the travel information ratio between the motor encoder
and the external encoder is as close to "1" as possible. Set the parameter initially to "x1."
To do this, note the values in variables H510 and H511.
• Move the drive by about 1000 increments (H511).
• Calculate the difference between the values you wrote down and the current values:
– H510 new – H510 old = H510 difference
– H511 new – H511 old= H511 difference
• Determine the quotient H511 difference divided by H510 difference. Set the para-
meter P944 Encoder scaling ext. to the value that is closest to the calculated
quotient.
.
Important: The encoder scaling directly influences the parameters P900 Reference off-
set, P942 Encoder factor numerator and P943 Encoder factor denominator and the pa-
rameter group P92x IPOS monitoring. All positions of the IPOS
plus®
program have to be
adjusted when using the external encoder. The setting of all listed parameters has to be
adjusted every time the encoder scaling is changed.
The number of pulses detected at X14 is multiplied by P944 and then mapped to H510.
The external encoder must always provide fewer pulses than the motor encoder. If this
is not possible, contact SEW-EURODRIVE.
P945 Synchro-
nous encoder type
(X14)
Setting range: TTL / SIN/COS / HIPERFACE
Enter the used encoder type here. Possible encoder types are:
• TTL: Encoder with digital, rectangular output signal (TTL level 0 V, 5 V, with negated
tracks, encoder with signal level according to RS422)
• SIN/COS: Encoder with analog, sine-shaped output signal (1 V
SS
)
• HIPERFACE
®
: Encoder with designation AV1H, AS1H, ES1H, EV1H
P946 Synchro-
nous encoder
counting direction
(X14) Setting range: NORMAL / INVERTED
Defines the counting direction of the synchronous encoder. The setting must be made
so the counting direction of the motor encoder (X15) and the synchronous encoder
(X14) match.
P947 Hiperface
offset X14
Setting range: –(2
31
– 1) ... 0 ... 2
31
– 1
This parameter is used to specify the zero point of the motor encoder display.
Use this parameter to define the machine zero without reference travel. It adds or sub-
tracts the offset from the encoder value.
• P947 Hiperface offset X14 has an effect on the actual position of the external encod-
er H510.
H510 = Encoder value – P947
SEW encoder type Startup parameters encoder type / encoder PPR count
ES1S / ES2S / EV1S / EH1S SINE ENCODER / 1024
AV1Y SINE ENCODER / 512
ES1R / ES2R / EV1R / EH1R INCREM. TTL ENCODER TTL / 1024
ES1T
1)
/ ES2T
1)
/EV1T
1)
/ EH1T
1)
1) via DWI11A only
INCREM. TTL ENCODER TTL / 1024
AV1H / AS1H / ES1H / EV1H HIPERFACE
®
P6..
P60.
P600