Parallel Sensorless Pump Controller
(PSPC) | Typical Specifications

1. General Description

  1. Pump Controls

1.1.Parallel Sensorless Pump Controller (PSPC)

1.1.1.Mechanical and Electrical Details

  1. For Sensorless IVS pumping units, Ref:____, operating in parallel, the pump logic controller shall be Armstrong Parallel Sensorless Pump Controller (PSPC). The PSPC pump logic controller shall be specifically designed for the control of multiple pumps in HVAC hot and/or chilled water systems that involve up to 4-variable speed pumps, with Sensorless Control, in parallel, staged, sequenced, and standby configurations. The PSPC pump logic controller shall allow field adjustments of control parameters as described below.
  2. The PSPC controller shall be capable of accepting, processing and displaying appropriate signals from the individual pump controls for the following values;
  3. System Status
  4. Total Sensorless flow
  5. Sensorless head
  6. Total power
  7. Pumps speed
  8. Alarm
  9. Wire to water efficiency (calculated)
  10. Number of pumps running
  11. Lead pump number
  12. Individual Pump Status
  13. Speed Ref (%)
  14. Speed (%) (rpm)
  15. Run time (hrs)
  16. Fault Nbr
  17. Run status (running/stopped)
  18. Individual Pump IVS-102 control status
  19. Current (Amps)
  20. Volts (VAC)
  21. Power (kW)
  22. Head
  23. Flow
  1. The PSPC pump logic controller shall be suitable for indoor or outdoor applications and shall be capable of being integrated with Design Envelope IVS pumping units for pumping packages approved to UL 778 & CSA STD C22.2 No 108 standards and also suitable for wall mounting with separate Armstrong IVS pumping units and stand-alone IVS102 pump controls.
  2. The PSPC controller shall have 3-levels of password security, first level to view only (No password required); the second level is for field adjustable parameters and the third level for factory/commissioning setup parameters.
  3. The PSPC controller shall stage the pumping units to ensure optimum pumping energy usage and shall sequence the pumps starting order, including any standby unit.
  4. The PSPC controller shall be fed with a power supply from each pumping unit controls in the control ‘daisy-chain’ so that a loss of power to any pump unit controls will not affect the PSPC controller pumping operation. Should the PSPC controller go off-line, all pumps in auto-mode will operate together to provide the correct system flow needs. Staging of the units will resume as the PSPC controller is brought back online.
  5. The PSPC integrated controller shall be capable of being easily integrated on any other pumping unit should the need occur. Simple mounting in pre-designed location and wiring will be all that is required.

1.1.2.Performance and Operating Logic

  1. The PSPC pump logic controller shall determine the most efficient combination of operating pumps, and pump operating speed based from the individual pump controls input.
  2. The PSPC pump logic controller shall respond to the system load flow needs by adjusting either the number of operating pumps, or the speed of the operating pumps.
  3. The PSPC pump logic controller shall continuously monitor the system requirements and ensure that the operating point is maintained on the PSPC control curve to meet the system needs with optimized pumping energy usage.
  4. The PSPC pump logic controller shall sequence the pumps based on a field adjustable interval of operating hours. The controls shall incorporate embedded logic to prevent hunting, pump flow surge, and motor overloading. The controller logic shall incorporate an adjustable PID control loop.
  5. Should any pumping unit or pumping unit controller fail, the appropriate alarm signal shall be activated. In the place of the failed assembly, a standby pumping unit shall be operated in variable speed mode, or the next pump will start if there is no standby.
  6. The PSPC controller shall have hand-off-automatic (H-O-A) control and should provide the option for a remote on/off signal by a BMS communication signal.
  7. The PSPC pump logic controller shall be self-prompting. All messages shall be displayed in plain English. The operator interface shall have multi-fault memory and recall on-screen help functions, and separate user screens for
  8. The PSPC pump logic controller shall automatically disable any flow signals that are not within limits and alert the operator of a possible control failure.
  9. The PSPC pump logic controller shall have the system design flow, system design head and minimum head limit entered as field adjustable parameters, factory loaded. The default for the minimum head is 40% of the design head.

1.1.3.Operator Screens

  1. Source of control: local or remote.
  2. PSPC status: on/off.
  3. Pump information: running/off/alarm, HOA status, pump ID 1, pump ID 2, stand-by, etc.
  4. Individual pump controls information: speed, amps, power, volts AC, flow and head
  5. Set point and error of flow and head
  6. Individual cumulative pump hours of operation
  7. System set-point and error

1.1.4.Alarm Screens

  1. Alarms with time stamp
  2. Alarm help
  3. Diagnostic indicating status (ok or bad) of PLC, memory,
  4. network and communication, PLC Software version

1.1.5.Setup Screens

  1. Level 0. No password, allows view only access
  2. Level 1. Allows modification of all parameters, except pump PID and BMS setup. Allows Restoring previously saved values
  3. Level 2. Allows modification of all parameters. Allows saving and restoring all parameters
  4. Levels 1 & 2 are password protected

1.1.6.BMS communication (Optional)

  1. The PSPC shall be capable of serial communication with a BMS [Optional] with either of the following protocols:
  2. Modbus RTU
  3. BACnet MS/TP
  4. LonWorks
  5. The following points will be available through all protocols:
  6. Total Sensorless flow
  7. Sensorless head
  8. Total real-time power consumption
  9. Pump speed
  10. Individual pump run status
  11. Alarm
  12. Wire to water system efficiency
  13. Number of pumps operating
  14. Lead pump ID
  15. Remote start/stop
  16. PSPC on/off status
  17. Pump controls information: running/off/alarm, HOA, duty 1, duty 2, stand-by, etc.
  18. Pump controls information: speed, current, power, Volts AC, flow and head
  19. Pump hours of operation
  20. Head and flow Set point

Parallel Sensorless pump controller (PSPC) | Typical specifications1 of 4