VB6 SERIES 6-WAY CONTROL BALL VALVES AND ACTUATORS - INSTALLATION INSTRUCTIONS
9
Printed in USA
31-00380M-02
IMPORTANT:
The zero (closed) position of the valve can be
achieved with control signal as shown in the
below table.
Floating/2-Position Run Mode
(Not recommended)
Using the MN7510A2001 actuator in floating /
2-position mode is not recommended with 6-way
valves. Both Sequence 1 and Sequence 2 are
closed at the actuator mid-stroke, 45 degree
actuator rotation. It must be possible to com
-
mand the actuator to position itself in the mid-
stroke position, which is difficult to do with preci
-
sion in floating mode, and impossible when float
-
ing mode is used for 2-position control.
If it is desired to use the 6-way valve for simple
seasonal changeover service, it is best if three
distinct positions can be achieved:
1. Fully clockwise actuator rotation for
Sequence 2 to be fully open.
2. Fully counterclockwise actuator rotation for
Sequence 1 to be fully open.
3. Exactly mid-stroke, 45-degree actuator
rotation, for Sequence 1 and 2 both being
closed.
This scheme can only be achieved with the actu
-
ator selector switch set to one of the four modu
-
lating modes, using 0-10 Vdc, 2-10 Vdc, 10-0
Vdc, or 10-2 Vdc to achieve full clockwise, full
counterclockwise, and precisely mid-stroke actu
-
ator positions. If desired, the actuator analog
feedback can be used to verify actual position.
If only step 1 and 2 above are desired, and there
is no need for step 3 to rotate the actuator to
exactly 45 degrees to turn both Sequence 1 and
2 completely off, the floating mode may be used
for 3-wire 2-position control.
Power-Off Behavior
If power is removed, the shaft adapter remains in
position.
Service/Off Mode
If the function selection switch is set to the “Ser
-
vice/Off” position, then all rotary movement is
canceled, and all control signals are ignored,
allowing the actuator to be manually operated
safely. Press and hold the De-clutch button and
use the handle to operate the actuator to
Sequence 1, 2, or, Off positions.
Overriding
The MN7510A2001 can be overridden to the
50% position by applying a 24 V signal to termi
-
nal 4 (see Figure 13.) With 24 V signal applied the
actuator will ignore the control signal at terminal
3 and instead drive to the 50% position closing
both Sequence 1 and Sequence 2.
Feedback
If correspondingly wired via terminal 5 (see Fig
-
ure 13 to Figure 15), the actuator provides a
feedback signal proportional to the actual posi
-
tion of the shaft adapter.
Valve closed command (45
degree actuator rotation)
Actuator Control
Signal Setting
Controller
Output
0-10 Vdc
5Vdc
2-10 Vdc
6 Vdc
10-0 Vdc
5Vdc
10-2 Vdc
6 Vdc
