MRP4 / MRP5 / MRP6
P. 4 / 8
EM-4824 Rev.7
OUTPUT SPAN ADJUSTABILITY
The servo-control circuit compares and amplifies input sig-
nal (setpoint) and feedback signal from a potentiometer, and
drives the motor to such direction to minimize difference of
the two signals.
The general operational range is 0 – 90 deg. or 0 – 180 deg.
with a 5-deg. margin at both limits. See Figure 5.
INSTALLATION
The following is a general procedure for mounting the MRP
to a valve with a yoke and coupling.
Be sure NOT TO CHANGE factory adjusted setting of the
MRP.
Remove power supply during the procedure unless other-
wise specified.
0
25
50
75
100
25
50
75
100
0
INPUT SIGNAL (%)
STEM POSITION (%)
Span Counterclockwise
Zero Clockwise
Zero Counterclockwise
Span Clockwise
Adjustable Zero Range
Adjustable Span Range
Figure 4. I/O Characteristics (Adjustable Range)
Table 1. Available Span Range for Each Model
MODEL
MIN. SPAN
MAX. SPAN
MRP4-1
MRP5-1
45°
90°
MRP6-1
MRP4-2
90°
180°
MRP6-2
Standard Zero Position
M
in
im
um
s
pa
n
M
ax
im
um
s
pa
n
M
ax
im
um
O
pe
ra
tio
n
R
an
ge
5 deg.
5 deg.
Adjustable Zero Range
Adjustable Span Range
Figure 5. Minimum & Maximum Span
MRPx
Bolts (M5)
Output Stem
Coupling
Yoke
Valve Bonnet
Figure 6. Example of the MRP Mounted to a Valve
1) Supply power to the MRP and apply 0% input (100% for
direct action). Turn the output stem fully clockwise (seen
from the cover).
2) Turn the valve stem to fully closed position (fully clock-
wise).
3) Set the yoke to the MRP.
4) Set the coupling to the valve stem and fit the MRP out
-
put stem into the coupling. Then fix the yoke and valve
temporarily.
5) Fix the coupling so that there is no eccentricity between
both stems.
6) Fix the yoke and valve firmly after checking the eccen
-
tricity of both stems again.
7) Attach the position indicator if required.
Rugghölzli 2
CH - 5453 Busslingen
Tel. +41 (0)56 222 38 18
Fax +41 (0)56 222 10 12
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