51-9
Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
the air supply to the filter, which is connected to the
Logix 500 series positioner.
3. With a maximum supply pressure of 87 psi (6 bar)
a regulator is not required.
4. With an operating pressure of more than
87 psi (6 bar), a reducing regulator is required. The
flow capacity of the regulator must be larger than
the air consumption of the positioner (4.12 scfm @
87 psi / 7 Nm
3
/hr @ 6 bar).
5. Connect the outlet connector Y of the positioner to
the actuator with tubing, independent of the action
(direct or reverse).
Wiring and Grounding Guidelines
Electrical connections: signal cable with cable passage
(NPT, PG13.5, or M20 x 1.5) to terminals 2 x 2.5 mm
Input signal: 4 – 20 mA, 4 – 12 mA, 12 – 20 mA
NOTE: Observe the minimum requirements of voltage
and equivalent electrical load: 12.0 VDC / 600
Ω
/ at
20 mA.
The performance is ensured only for a minimum input
current of 3.6 mA.
For wiring, the following notes should be observed:
NOTE: The input loop current signal to the Logix 500
should be in shielded cable. Shields must be tied to a
ground at only one end of the cable to provide a place
for environmental electrical noise to be removed from
the cable. In general, shield wire should be connected
at the source. (Figure 8)
Connect the 4-20 mA current source to ter11
and -12 (Figure 8).
Grounding Screw
The grounding screw, located inside the positioner
cover, should be used to provide the unit with an ad-
equate and reliable earth ground reference. This ground
should be tied to the same ground as the electrical con-
duit. Additionally, the electrical conduit should be earth
grounded at both ends of its run. The grounded screw
must not be used to terminate signal shield wires.
Compliance Voltage
(Figure 9)
Output compliance voltage refers to the voltage limit
the current source can provide. A current loop system
consists of the current source, wiring resistance, bar-
rier resistance (if present), and the Logix 500 imped-
ance. The Logix 500 requires that the current loop
system allow for a 12.0 VDC drop across the positioner
at maximum loop current.
CAUTION: Never connect a voltage source directly
across the positioner terminals. This could cause
permanent circuit board damage.
In order to determine if the loop will support the Logix
500, perform the following calculation.
Voltage = Compliance Voltage (@Current
MAX
)
- Current
MAX
*(R
barrier
+ R
wire
)
The calculated voltage must be greater than 12.0 VDC
in order to support the Logix 500.
Example: DCS Compliance Voltage = 19 V
R
barrier
= 300
Ω
(if present)
R
wire
= 25
Ω
CURRENT
MAX
= 20 mA
Voltage = 19 V - 0.020 A*(300
Ω
+ 25
Ω)
= 12.5 V
Figure 8: Wiring Diagram
Connection
Description
+11
Input +
-12
Input -
+41*
Limit switch 1 +
-42*
Limit switch 1 -
+51*
Limit switch 2 +
-52*
Limit switch 2 -
Y
Pneumatic output signal (outlet)
Z
Air supply (inlet)
*
= Optional connection
Table 8: Connection Table
PIEZO
RELAY
POT.
LS1
LS2
Internal
Housing
EARTH
Terminal
External Housing
Limit Switch 1
Limit Switch2
4-20 mA
Signal
Connect Shield at
Source Ground
-
+
4-20 mA Current Source
Shielded
Cable
Y
Z
