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Chiller and Condenser Pump Control
The control system allows for Duty-Standby functionality on
both Chiller and Condenser Pumping. The image below
shows Rotation and Mode:
Note: Only available for module dedicated pumps.
1. Rotation:
a. Disabled – pump 1 always runs. Pump 2 only
runs if Pump 1 fails.
b. Rotation – each invocation rotates pumps
based on Runtime.
c. Toggle – Switches pump duty.
d. Pump X run selected pump.
Figure 35. Pump control HMI page
2. Mode:
a. Disabled – no pump function
b. Differential Pressure Control
c. Delta Temperature Control
d. Pass-Through Control
e. Dual Speed Control
f.
Flow Control
The following section details the mode functions. The
setup screens below look and work similarly and have
the following common features:
•
Pump Data:
–
Provides available control signals. Extreme values
or 0.0 values are likely not signals that can be used.
•
HOA – one control for both pumps:
–
Off – no Pump Function
–
Hand – duty pump is enabled and manual speed
value.
–
Auto – Duty pump is controlled by controller
according to mode and setpoints.
•
Pump Count – 1 or 2.
ARTC-SVX007A-EN
•
Rotation time – pumps alternate operations duty at
discrete times.
•
Flow warning time – when expires, pump is assumed
failed and the system switches operation.
•
Delay a switch-over – last pump running to let new duty
pump get to speed.
•
PI controls:
–
Gain – negative value indicates reverse-acting.
–
Integral in seconds.
•
Sensor Fail Speed – should control sensor fail, pump
runs at this settable speed.
Differential Pressure Control
Pump differential control monitors pressure drop across
inlet and outlet to the chiller and drives the pump between
max and min speed.
2 sources:
1. T3C DP
2. Companion DP
Figure 36. Differential pressure control screen
Delta Temperature Control
Delta temperature pump control monitors the inlet and
outlet temperatures to the chiller and maintains a constant
Delta-T across by controlling the pump between max and
min speeds.
Operating Procedures
49
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