Velocity Encoder Installation And Wiring; Encoder Mounting - MCi iControl User Manual

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Velocity Encoder Installation and Wiring

The velocity encoder reports hoist motor speed to the controller. The encoder must be mounted
and wired according to the drawings. When installed, the encoder must be electrically isolated
from the motor or any other ground. (Resistance between the encoder casing and the motor or
other ground should be "infinite.")
Do not place the encoder or its wiring close to a magnetic field (the motor or brake coils). Mag-
netic fields can induce AC into the encoder signal. This can cause the Drive to miscount, pro-
ducing erratic control at lower speeds.
Note
The encoder wiring must use a separate grounded conduit. Inside the controller cabinet, if con-
trol wires must cross power wires, they must cross at right angles to reduce the possibility of
interference. Some cables, like the EnDat encoder cable, require a one inch or larger conduit
due to the size of the connector.

Encoder Mounting

The following illustration shows two typical encoder installations.
Figure 2.7 Typical Encoder Installations
Hoist motor
Hoist motor
shaft
Velocity Encoder
2-24 Manual # 42-02-2222
Typical mounting
bracket
9-pin D
Connector
Velocity
Encoder
Isolator
bushing
Hoist motor shaft
Flexible coupling
Phenolic
isolator