SERIES 71, 72, AND 76 MODUTROL IV MOTORS
9
63-264008
Zero and Span Adjustment for
M7284Q, M7285Q, and M7294Q
M7284Q, M7285Q, and M7294Q actuators have the capability
of adjustable zero and span. Fig. 10 shows the module with the
zero and span potentiometers.
Zero:
Sets input voltage to define the 0% angle of rotation. It is
factory set to minimum position and can be adjusted to the
maximum position of 20mA or 10V.
Span:
Adjusts motor response to travel a full stroke through
the selected input span. It is factory set to maximum position,
and is adjustable from 4-20mA or 2-10Vdc.
1.
Adjust the start potentiometer fully clockwise (maximum
zero) and the span potentiometer fully counterclockwise
(minimum span). See Fig. 10.
2.
Set the controller current to the value required to drive
the motor to the closed position.
3.
Turn the start potentiometer slowly counterclockwise
until the motor begins to open. This is defined as the
start or zero setting.
4.
Set the controller current to the value required to drive
the motor to the fully open position. The motor will open.
5.
Turn the span potentiometer clockwise until the motor
starts to close. The difference between the fully open
span position current and the zero position current is
defined as the operating span.
6.
Recheck the start and readjust the span potentiometer if
necessary. Turn the start potentiometer clockwise to
increase the zero position.
7.
Recheck the span and readjust the span potentiometer if
necessary. Turn it clockwise to increase the full span
position.
8.
For sequential operation, as shown in Fig. 11, repeat the
above steps for each motor.
Fig. 10. Terminals and adjustments.
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