99
JOHNSON CONTROLS
FORM NO.: 6U6K-B01E-NB-EN
low pressure centrifugal pumps with flange connection and
mechanical seal.
CONTROL MODES
The selectable control modes are:
Δp-c:
The electronics keep the differential pressure created by the
pump above the permitted feed flow range constantly at the pre-
selected differential pressure setpoint Hs up to the maximum
pump curve.
Q = Volume flow
H = Differential pressure (min./max.)
HS = Differential pressure setpoint
Δp-v:
The electronics linearly change the differential pressure setpoint
to be kept by the pump between the delivery heads Hs and ½
Hs. The differential pressure setpoint Hs decreases or increases
with the volume flow.
Q = Volume flow
H = Differential pressure (min./max.)
HS = Differential pressure setpoint
Manual control mode:
The speed of the pump can be kept to a constant speed between
nmin and nmax. “Manual control” mode deactivates all other
control modes.
PID control:
If the aforementioned standard control modes cannot be used
– e.g. if other sensors are to be used or the distance between
the sensors and the pump is very large – then the PID control
(Proportional- Integral-Differential control) is available.
By selecting a good combination of individual control portions,
the operator can ensure fast reacting, constant control without
lasting setpoint deviations.
The output signal of the selected sensor can take any
intermediate value. The respective actual value reached
(sensor signal) will be shown as a percent (100 % = maximum
measurement range of the sensor) on the status page of the
menu.
SECTION 6 – COMMISSIONING
Cooke Industries - Phone: +64 9 579 2185 Email: [email protected] Web: www.cookeindustries.co.nz
