FULTON ModSync SE - VFD System Pumps 3

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3-39
SECTION 3 ModSyncSE-User-Manual-211020 OPERATION
! WARNING
This manual is provided as a
guide to the correct operation and
maintenance of your equipment,
and should be read in its entirety and
be made permanently available to
the sta responsible for equipment
operation. It should not, however
be considered as a complete code
of practice, nor should it replace
existing codes or standards which
may be applicable. Fulton reserves
the right to change any part of
this installation, operation and
maintenance manual without notice.
Do not install, operate, service,
or repair any component of this
equipment unless you are qualied
and fully understand all requirements
and procedures.
All information in this manual is for
reference and guidance purposes,
and does not substitute for required
professional training, conduct,
and strict adherence to applicable
jurisdictional /professional codes or
regulations
 VFD System Pumps 3
The PID compares the system dierential pressure or dierential temperature
to the respective setpoint and creates a control variable output based on
how far away from setpoint the pressure or temperature is and how long the
pressure or temperature is away from it.
 Proportional Band: The Proportional Band is a range dened around the
dierential pressure or dierential temperature setpoint.
» A broad (Large) proportional band causes a more gradual
response from the controller. Typically, this will reduce setpoint
overshoot.
» A narrow (Small) proportional band causes a more rapid response
from the ModSync®. However, the system may tend to overshoot
setpoint.
 Integral Time: The Integral Time set is the amount of time, as calculated
by the controller, required to bring the dierential pressure or dierential
temperature up to setpoint.
» A broad (Large) Integral will cause a more gradual response from
the controller.
» A narrow (Small) Integral will cause a more rapid response. Note
that if you set a short Integral time, the function will respond very
quickly and may overshoot the setpoint.
 Derivative Time: Derivative time responds to the rate and direction of
the change in the CV. Not typically used in slow acting systems such as
hydronic applications.
FIGURE 39 - VFD SYSTEM PUMP CONFIGURATION SCREEN 2