Avtron HS6A, Инструкция по эксплуатации, Страница: 2 / 29

HS6A 2
The hollow shaft HS6A design eliminates the potential for coupling
failures from misalignment, however, excessive housing movement
(wobble) may cause undesirable vibrations and bearing damage. The
higher the RPM, the more severe the vibration will be from housing
movement. In a typical installation a housing movement of 0.007”
[0.18mm] TIR or less (as measured at the outside diameter of the
main encoder body) will not have an adverse effect.
1) Disconnect power from equipment and encoder cable.
2) Use caliper gauge to verify motor shaft is proper diameter and
within allowable tolerances: +0.000”, -0.0005”
[+0.00, -0.013mm].
3) Clean machine shaft of any dirt and remove any burrs.
4) Use dial indicator gauge to verify the motor shaft: Total
Indicated Runout (TIR) <0.002” [0.05mm].
5) Install the anti-rotation bracket tether to the face of the encoder
using screws and lock washers, included with the tether.
6) Loosen clamping collar screw.
7) Test Fitting: carefully slide the encoder onto the shaft to verify
fit. Ensure a minimum of 1/8” [2mm] between encoder and
mounting surface. DO NOT FORCE. Encoder should slide on
easily. If the encoder does not fit easily, remove it, verify shaft
size, and check for burrs and shaft damage.
8) Slide the HS6A at least 1” [25mm] onto the shaft.
9) Tighten screws on clamping collar.
DO NOT USE A STANDARD RIGHT ANGLE WRENCH. Use only a
T-handle hex wrench or torque wrench with hex bit.
10) Secure free end of the anti-rotation tether to frame using bolt
or T-bolt. The bracket should be parallel to the encoder
face, 90 degrees to the shaft to avoid encoder bearing damage.
Use additional washers as needed to ensure the tether is
parallel to the encoder face.
11) Turn shaft by hand and verify the shaft turns freely and does
not produce excessive runout/wobble of the encoder (<0.007”
TIR [0.18mm], Total Indicated Runout.) Ensure the tether is
secure and the encoder body cannot rotate.
12) Connect cable as shown in wiring diagram.
13) Apply power to the encoder.
14) Rotate the shaft by hand, or using jog mode of the speed
controller and verify proper direction and position output.
ENVIRONMENTAL CONSIDERATIONS
Follow these steps to reduce potential problems:
1) Always mount connection points, conduit couplings, junction
boxes, etc., lower than actual encoder.
2) For washdown areas, shroud or otherwise cover the encoder to
prevent direct water spray. Do not attach the shroud directly to
the encoder.
REPAIRS
REMOVAL INSTRUCTIONS:
1. Unbolt tether from mounting point on motor or machine.
2. Loosen clamping collar screw.
3. Slide the encoder off the shaft.
REPLACING PARTS
The HS6A has two items that are user-replacable in the field in case
of damage:
1. Shaft sizing insert: Simply slide the insert out of the HS6A and
replace it with the new bore size insert. Insert should remove
and install with modest force-do not pound the insert into the
HS6A.
2. Tether system: To replace the tether system, remove the
retaining screw(s), then replace with the new tether.
CAUTION
Do not attempt to remove, service, or adjust any of the
internal components of the HS6A.
WIRING INSTRUCTIONS
CAUTION
Remove power before wiring.
Interconnecting cables specified in the wire selection chart are
based on typical applications. Refer to the system drawing for
specific cable requirements where applicable.
Physical properties of cable such as abrasion, temperature, tensile
strength, solvents, etc., are dictated by the specific application and
communications bus. Do not use unshielded cable. Ground one end
(only) of the shield to earth ground.
Do not run encoder wiring parallel to power cable wiring for
extended distances, and do not wrap encoder cable around power
cables.
TROUBLESHOOTING:
If the controller indicates a loss of encoder fault, check the encoder
power supply at the encoder. If power is present at the encoder,
check polarity. If the wiring appears correct and in good shape,
test the wiring by replacing the AV6M. If the controller still shows
encoder loss/fault, then the wiring is faulty and should be repaired or
replaced.
An oscilloscope can also be used to verify output of the HS6A
encoder at the encoder connector itself and at the drive/ controller
cabinet. Depending on the communication method, signals will vary
but the oscilliscope should show the output signals varying. Keep in
mind that SSI and Profibus DP are master-slave systems and require
the controller to signal the encoder to transmit position.
Read each section for specifics about each bus and troubleshooting
tips.
SSI TROUBLESHOOTING
For SSI, monitor the clock input line to ensure the controller is
triggering the encoder to send position. The clock should obey the
signal requirements shown in the SSI signal section, and should
appear as a rapid set of transitions on the clock line. The encoder
data transmit lines should change state as data is clocked out. Note
that the varying binary patterns representating position can produce
pulses of varying width--this is normal.
PROFIBUS-DP TROUBLESHOOTING
Viewing on oscilliscope: for Profibus DP, the transmit and receive
signal pairs should change state rapidly as the controller transmits
messages to the encoder and the encoder replies. Transmission
rates vary, but these messages can be extremely short and typically
require scope triggering to spot them.
For Profibus DP, ensure termination resistors are in place (or
switched on) at each end of the cabling system, and that no
termination resistors are in placed or activated in the middle of
the system. Remove the connections to the master controller and
all devices, or power down all devices. Measure the resistance
between the communication wires. The value should be ~1/2 of the
termination resistor value on the network. If the resistance is greater
than the limit, a termination resistor is missing from the network. If
the resistance is less than the limit, there are incorrect termination
resistors switched on or connected to the system.
CANOPEN TROUBLESHOOTING
For CANOpen: disconnect the power connection, then ensure there
are no short circuits between any of the signal or power wires or
shield.
Viewing on oscilliscope: for CANOpen the transmit and receive
signal pairs should change state rapidly as the controller transmits
messages to the encoder and the encoder replies. Transmission
rates vary, but these messages can be extremely short and typically
require scope triggering to spot them.