WIRING
CAUTION
Be sure to remove power before wiring the encoder.
Be sure to ground the cable shield: It can be con-
nected to case ground at the encoder, or grounded
as the receiving device, but should not be grounded
on both ends. See note below for Danaher/North-
star wiring.
Refer to the wiring diagrams for specific information on each
option.
The AV45 can be wired for single phase or two phase, either with
or without complements, with or without markers. For bidirection-
al operation, Phase A channel leads phase B channel for clock-
wise shaft rotation as viewed from the anti-drive or accessory end
of the motor (AV45 mounting end).
CAUTION
Be sure to observe maximum current limits for me-
chanical overspeed switch option. Exceeding these
limits can cause arcing and cause switch failure;
this may result in property damage, injury or even
death.
NOTE
Wiring option “G” provides a pinout compat-
ible with Northstar
TM
encoders, with a cable shield
connection on pin 10. Note that this option does
not ground the shield; Avtron still recommends
grounding the shield at the drive end of the cable
for all wiring options.
CORRECTIVE ACTION FOR PHASE REVERSAL
1) Remove Power.
2) Exchange wires on cable, either at encoder cable end,
or at speed controller end (but not both).
a)
Single Ended 2 Phase Wiring (see wiring diagram)
Exchange A and B at the use end of the wires.
b)
Differential 2 Phase Wiring (see wiring diagram)
Exchange
either A with A– in the phase A pair OR
B with B– in the phase B pair but NOT both.
3) Apply Power.
4) Verify encoder feedback is correct, using hand rotation
of shaft, or jog mode of the speed controller.
Interconnecting cables specified in the wire selection chart are
based on typical applications. Physical properties of cable such
as abrasion, temperature, tensile strength, solvents, etc., are dic-
tated by the specific application. General electrical requirements
are: strand ed copper, 22 through 16 AWG (Industrial EPIC con-
nector type options can use 14 AWG), each wire pair individually
shield ed with braid or foil with drain wire, .05 uf of maximum total
mutual or direct capacitance, outer sheath insulator. See specifica-
tions for maximum cable length. Strand ed 22 AWG wire should not
be used for cable runs great er then 61 meters. If 22 AWG is used
with EPIC type connector options the wire ends should be tinned.
FAULT-CHECK
After power-up and the rotor position is checked by the sensor,
the Fault-Check LED will turn green.
FIGURE 5
VARIATION > ± 15%
PHASE A
PHASE B
7
If the adaptive electronics reach their adjustment limit for any
reason, the Fault-Check alarm and LED will notify the drive and
operator of an impending failure. The LED will turn red if the Adap-
tive Electronics reach their adjustment limit. This output occurs
before an actual failure, allowing steps to be taken to replace the
unit before it causes unscheduled downtime. Fault-Check annun-
ciation is available as an “alarm” output through the connector and
as an integral LED.
TROUBLESHOOTING
If the drive indicates a loss of encoder/tach fault and the AV45
fault-check LED is not illuminated, check the encoder power sup-
ply. If power is present, check polarity; one indicator of reversed
power supply is that all outputs will be high at the same time. If
the drive indicates encoder fault, but the LED shows GREEN,
then check the wiring between the drive and the encoder. If the
wiring appears correct and in good shape, test the wiring by re-
placing the AV45. If the new unit shows GREEN, and the drive still
shows encoder loss/tach fault, then the wiring is faulty and should
be repaired or replaced.
If the alarm output and/or LED indicate a fault (RED) on a properly
mounted AV45 and the rotor is properly located, replace the AV45.
An oscilloscope can also be used to verify proper output of the
AV45 encoder at the encoder connector itself and at the drive/con-
troller cabinet. If the outputs show large variations in the signals
at steady speed (jitter or “accordion effect”, see figure 5), replace
any magnetized material nearby with non-magnetic material
(aluminum, stainless) (shafts, etc). If variations persist, consider
replacing with super-shielded models, option -004.
