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Manual – IPOSplus®
7
Position detection with MQx
Position Detection via Binary Inputs
7.5.3
Position detection with built-in encoder
The binary inputs (counter inputs) of the MQx have the following technical data:
For MQx, SEW-EURODRIVE recommends the EI76 built-in encoder.
Proceed as follows to use a built-in encoder:
1. Connect the encoder to the digital inputs of the MQx module. Use inputs DI0 and DI1.
2. Set the following parameters (indexes):
•
P608 binary input DI03
to "MQX ENCODER IN" (Index 8844 to "32"),
•
P600 binary input DI11
to "MQX ENCODER IN" (Index 8335 to "32"),
The position is determined in the IPOS variable H511 (ActPos_Mot) and is always "0"
when the line voltage is switched on.
A reference travel can only be performed by an IPOS
plus®
program.
7.5.4
Encoder monitoring
The two encoder cables are checked for wire breaks. The cables are only monitored
when MOVIMOT
®
is enabled. If a signal in at least one of the encoder cables does not
change for 1 s, a wire break is detected and displayed by fault 14. MOVIMOT
®
stops
and can only be started again when the MQx has been reset. During this process, the
current position is lost and the system must be referenced again. Encoder monitoring
can be switched on or off using parameter P504 (Encoder monitoring for motor).
7.5.5
Storing the actual position
When a MOVILINK command contacts address 253, the actual position can be stored
at any time in a variable in the range H0 ... H127 in a non-volatile memory. We recom-
mend you save the position each time the drive moves to a new actual position. This
ensures that you do not have to perform reference travel when you restart the unit.
Referencing is, however, still required if the MQx voltage is disconnected during a posi-
tioning operation. The module is designed to cope with 10 billion write cycles.
Binary inputs
Encoder signals (2 tracks)
Track A and track B
Phase position
90° ± 20°
Mark space ratio
1:1 ±20%
Max. pulse frequency
4 kHz
Connection of track A
DI0
Connection of track B
DI1
P
i
f
kVA
Hz
n
P
i
f
kVA
Hz
n