Bray 70 Series SERVO PRO - Manual (Page 15)

13
BRAY Series 70 Servo Pro
Operation and Maintenance Manual
5.0 H
ardWare
d
escriPtion
The microprocessor-controlled Servo Pro enhances the
operation of the S70 actuator by providing full positioning
control, supplying an actuator position feedback signal,
responding to various switch input conditions, performing
self-diagnostics and indicating operational status.
The Servo Pro microprocessor eliminates the need to
adjust potentiometers during calibration. Calibration is
performed by simply pressing a button. The Servo Pro
will automatically seek the fully closed and fully open
travel limits and store the values in non-volatile memory.
5.1 t
erminal
b
lock
c
onnections
notice
The Servo Pro will accept wire sizes ranging from 14
to 24 AWG.
18 AWG wire is recommended.
Larger wire than 14 AWG could damage the terminal
block connections and should not be used.
Each terminal connection on the Servo Pro is clearly
labeled on the top silk screen to simplify wiring as shown
in Figures 2 and 3.
5.1.1 P
oWer
i
nPut
t
erminals
The electric power supplied to the Servo Pro drives the
actuator motor, all the circuitry inside the module, plus
all the devices connected to the module such as the limit
switches, torque switches, handwheel switch, control box,
output signal and anti-condensation heater.
notice
The electric power supplied to the Servo Pro must
match the rating shown on the Servo Pro nameplate.
Each different rating (100 VAC, 220 VAC or 24 VAC)
requires a different Servo Pro unit.
The Servo Pro must be installed in an actuator that
matches the rating shown on the Servo Pro name-plate.
For instance, a 110 VAC Servo Pro must be installed in
a 110 VAC actuator.
caution
The terminal block connections designed for high
voltage are placed behind a solid line labeled HIGH
VOLTAGE on the silk screen. Dangerous high
voltage (110 VAC or higher) can be present on any of
these conductors when the Servo Pro is operating.
Use caution to avoid injury to personnel or damage
to equipment.
Do not connect any 110 VAC or 220 VAC conductors to
any terminal blocks outside this labeled area.
The Servo Pro is designed to accept a single phase AC
line voltage of the proper value.
The Live conductor should be connected to the Live
terminal. The Neutral conductor should be connected
to the Neutral terminal.
5.1.2 c
ommand
s
ignal
i
nPut
t
erminals
Apply the command signal input
notice
Note: 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
The Servo Pro accepts a command signal from the
process controller that represents the desired position
of the actuator. The customer wires the command signal
to an output from their process controller.
The command signal has polarity that must be observed.
Connect the positive conductor of the command signal to
the INPUT (+) terminal. Connect the negative conductor
of the command signal to the INPUT (-) terminal.
The command signal has four different ranges selectable
through configuration switches.
A potentiometer 10k ohm (or larger) can be used to
generate a command signal. Wire one fixed terminal of
the pot to the terminal labeled +5 Volts. Wire the wiper of
the pot to the terminal labeled INPUT (+). Wire the other
fixed terminal of the pot to the terminal labeled INPUT (-).
Set the command signal to 0-5VDC using Configuration
!