Electrical installation
Wiring of the feedback system
Encoder connection
5
97
EDBCSXA064 EN 3.2
5.6.2 Encoder connection
Danger!
Valid when using an operating software up to and including V7.0:
When absolute value encoders are used, uncontrolled movements of the drive
are possible!
If an absolute value encoder is disconnected from the axis module during
operation, the fault OH3−TRIP occurs. If the absolute value encoder now is
connected to X8 again and a TRIP−RESET is carried out, the drive may start up in
an uncontrolled manner with a high speed and a high torque. A SD8−TRIP will
not occur, as would be expected.
Possible consequences:
ƒ Death or severe injuries
ƒ Destruction or damage of the machine/drive
Protective measures:
ƒ If a fault (trip) occurs during commissioning when an absolute value
encoder is used, check the history buffer C0168. If an Sd8−TRIP is at the
second or third place, a reinitialisation is absolutely necessary
. For this
purpose, switch off and on again the 24−V supply of the control electronics.
Via the 9−pole Sub−D−plug X8, you can connect the following encoders:
ƒ Incremental encoder (TTL encoder)
– with two 5 V complementary signals (RS−422) that are electrically shifted by 90°.
– with zero track that can be connected optionally.
ƒ Sin/cos encoder (singleturn or multiturn rotary transducer)
– with supply voltage (5 ... 8 V).
– with serial communication.
The initialisation time of the axis module is extended to approx. 2 s.
The controller supplies the encoder with voltage.
Use C0421 to set the supply voltage V
CC
(5 ... 8 V) to compensate, if required, the voltage
drop [DV] on the encoder cable:
DU ^ 2 @ L
L
[m] @ Rńm[Wńm] @ I
G
[A]
DV Voltage drop on the encoder cable [V]
L
L
Cable length [m]
R/m Ohmic resistance per meter of cable length [W/m]
I
G
Encoder current [A]
Stop!
Observe the permissible supply voltage of the encoder used. If the values in
C0421 are set too high, the encoder can be destroyed!
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