35
For maximum noise immunity, the encoder cable shall consist of
individually shielded twisted pairs with one overall shield. The individual
shields should be connected to 0V (com) pin 13 on the Sub D connector
and be kept separate from the outer shield. The outer shield should be
connected to earth ground, the housing of the Sub D connector.
The cable shall be kept a minimum of 8 inches (20 cm) away from
all wires having greater than 24VDC on them. For best results run
the encoder cable in a separate conduit from the controller to the
motor.
1. Maximum Encoder voltage: +5.2 V
2. Encoder line number: 1...16383 ppr
2500 ppr is recommended and gives best speed resolution and regulation
performance for applications with a maximum motor speed of up to
4500 rpm.
F5M Interface cutoff frequency: 300 kHz
Observe cutoff frequency of the encoder:
g • n
max
f
limit
> —————————
60
g = Encoder increments (ppr)
n = Encoder speed (rpm)
f = Encoder operating frequency (Hz)
3. Signal speci cations:
Four signals consisting of two square-wave
pulses that are electrically 90° out of phase
and their inverse signals (TTL-push-pull
signals / RS422-conformity). Minimum "on"
voltage level is 2.0V and maximum "off"
voltage level is 0.5V. The encoder must be
electrically isolated from the motor shaft.
Otherwise noise from the motor may corrupt
the encoder signals.
4. Cable speci cations: The encoder cable shall not be so long such
that the voltage drop in supply voltage on the encoder cable results in a
voltage less than the minimum encoder supply voltage. Typically encoder
lines should not be longer than 160 ft (50 m). The following must be valid
for trouble free operation.
[ (I
Encoder
• R
Line
) + V
Encoder (min)
] < +5.2 V
R
Line
is the sum of the resistance of the supply wires both +V and com.
2...5 V
B+
B-
A+
A-
0 V
Installation and Connection
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