9
Series 70 Servo Pro
Operation and Maintenance Manual
proper position to match the travel switch
factory default (fully close at 0 degrees and
fully open at 90 degrees)
c. If the travel switch settings are moved from
the factory default position, the internal
feedback potentiometer must be adjusted
to match the new travel switch setting. This
is done by performing a calibration routine.
d. For more details on setting the travel switch
settings, refer to the S70 Operation and
Maintenance Manual.
F. Select the Torque Switch Enable or Disable
a. If optional torque switches are installed in the
actuator, select Torque Switch Enable. The
optional torque switches must be properly
set and wired to the Servo Pro. Refer to the
S70 Operation and Maintenance Manual for
more information.
b. If optional torque switches are not installed
in the actuator, select Torque Switch Disable.
WARNING
Before applying the appropriate electrical supply
voltage, verify that the actuator and Servo Pro
have been properly wired to the factory supplied
wiring diagram.
NOTICE
To prevent noise coupling between conductors,
power lines and signal/communication lines should
not be routed together in the same conduit or cable
tray. If they must cross each other, then it should
only be done at right angles
Recommended distances below should be
maintained between power and signal/
communication conduit:
Metal Conduit:
Conductor carrying less than 20A = At least 4 in.
Conductor carrying more than 20A up to 100kVA =
At least 8 in.
Conductor carrying more than 100kVA =At least
1.5 ft.
Non-Metallic Conduit:
Conductor carrying less than 20A = At least 8 in
Conductor carrying more than 20A up to 100kVA =
At least 2 ft.
Conductor carrying more than 100kVA = At least
3 ft.
Please refer to NEC guidelines for proper wiring
techniques in USA. Other countries must follow
all local codes for safety requirements.
Shielding
Signal/communication lines should be shielded.
Shield must be grounded at one end only, preferably
at the controller. Grounding the shield at more than
one location can introduce noise in the circuitry by
forming ground loops.
G. Apply the command signal input
NOTICE
Ensure that your controller is able to provide the
proper command signal range given the following
input impedance values:
4-20 mA 200 Ohm
0-5 VDC >10 MOhm
0-10 VDC >10 MOhm
a. The command signal must be connected to the
proper terminals. Refer to the wiring diagram.
b. The command signal input must match
the range selected with the configuration
switches.
c. The command signal must be a valid value
(i.e., if 4-20 mA DC is selected, the value
must be no less than 4 mA and no greater
than 20 mA.)
d. Note: a good value to select for Calibration
would be mid-travel (i.e. 12 mA DC)
Isolation Transformers
For circuits that are located in the proximity of
excessive electrical noise generators, isolation
transformers should be used to filter and prevent
noise from entering into the circuitry.
Transient Suppression
Electromagnetic Interference (EMI) can result
from inductive loads, which can adversely affect
electronic circuits.
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