NORD Drivesystems BU0510 - Manual (Page 12)

POSICON position control for NORD frequency inverters, SK 530E and above
12 Subject to technical alterations BU 0510 GB-3911
2.2.1 Incremental encoders
According to the resolution (pulse number), incremental encoders generate a defined number of pulses for
each rotation of the encoder shaft (Track A / Track A inverse) With this, the precise speed of the encoder or
motor can be measured by the frequency inverter. By the use of a second track (B / B inverse) shifted by
90° (¼ period), the direction of rotation can also be determined. In turn, the "zero track" (0 / 0 inverse)
provides exactly one pulse per rotation and can therefore be used as a referencing signal for positioning
systems.
The voltage source can be an external source or the internal voltage (according to the frequency inverter
version: 12V /15V /24V).
Function
Cable colours,
for incremental
encoder
Assignment for SK 53xE Assignment for SK 54xE*
10-30V supply brown / green
X5:42(/44)
15V (/24V)
X5:42( /X5:44 /X6:49)
15V ( /24V /12V)
0V supply white / green X6:40 GND/0V X5:40 GND/0V
Track A brown X6:51 ENC A+ X6:51 ENC A+
Track A inverse green X6:52 ENC A- X6:52 ENC A-
Track B grey X6:53 ENC B+ X6:53 ENC B+
Track B inverse pink X6:54 ENC B+ X6:54 ENC B+
Track 0 red -- X14:63 CLK +
Track 0 inverse black -- X14:64 CLK-
+ 5V Sense blue -- X14:65 DAT +
0V Sense white -- X14:66 DAT -
Cable shield connected to a large area of the frequency inverter housing or shielding angle
*Zero track not necessary for speed feedback or operation of asynchronous machines.
Table 1: Connection assignments for incremental encoders
Evaluation of the zero track and the Sense signal is necessary for the operation of PMSM (Permanent Magnet
Synchronous Motors). The zero impulse is then used for synchronisation of the rotor position. The offset
between the zero pulse and the actual "zero" rotor position is set in parameter P334 "Encoder offset". If the
Sense cable (+5V Sense and 0V Sense) is not connected, there is no synchronisation to the zero pulse. The
zero track is not required for asynchronous machines. Alternative to the commutation of the position,
Hiperface, BISS, Endat or SSI encoders with additional Sin/Cos or incremental tracks may be used.
NOTE
If there are deviations from the standard equipment (Type 5820.0H40, 10-30V encoder,
TTL/RS422) for the motors, please note the accompanying data sheet or consult your supplier.