WEG CFW700 User Manual - page 28
CFW700 | 23
Installation and Connection
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Table 3.2: Technical specifications for the encoder and the encoder cable
Characteristics
Specifications
Encoder
Power supply
5 V
Channels
2 channels in quadrature (90º) + zero pulses with complementary outputs
(differentials) or open-collector.
Signals
A, A, B, B, Z and Z
Available for 2 channels: A, A, B, B.
If the channel zis not used, leave the terminals XC1: 6 and 7 not
connected. Noother setting are necessary.
Output circuit
Linedrive type, push-pull or open-collector. Maximum voltage of 12 V.
Isolation
Electronic circuit isolated from the encoder frame.
Pulses
Recommended number of pulses per rotation = 1024 ppr.
Frequency
Maximum allowed = 100 kHz.
Encoder
cable
Type of cable
Balanced cable shield (for differential signals operation).
Connection
The cable shield must be connected to ground through devices on
control shield plate (see
).
Distance
≥ 25 cm of other wiring.
Isolation
Use metal conduit.
Length
Maximum = 10 m.
Follow instructions below for the proper installation of the control wiring:
1. Wire gauge: 0.5 mm² (20 AWG) to 1.5 mm² (14 AWG).
2. Maximum tightening torque: 0.50 N.m (4.50 lbf.in).
3. Use shielded cables for the connections in XC1 and run the cables separated from the
remaining circuits (power, 110 V / 220 Vac control, etc.), according to
. If control wiring must cross other cables (power cables for instance),
make it cross perpendicular to the wiring and provide a minimum separation of 5 cm (1.9 in)
at the crossing point.
Refer to
item 3.2.6 Cable Distances on page 23
, for the proper cable distances.
Do not ground
Inverter
side
Isolate with tape
(a) Cable shield connection
(b) Connection sample of the shield to
ground
Figure 3.7: (a) and (b) Shield connection
4. Relays, contactors, solenoids or coils of electromechanical brakes installed close to the
inverter may eventually create interferences in the control circuitry. To eliminate this effect,
RC suppressors (with AC power supply) or free-wheel diodes (with DC power supply) shall
be connected in parallel to the coils of these devices.
3.2.6 Cable Distances
The power cables and control cables must be separated (relay output cables and other control
cables) according to
.