Instruction manual

Instruction manual αlpha DO 2000
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1. Select the “CNTR” subfunction, then press the ENT key.
2. Selecting the controller type: press the ▲ or ▼ key to select the suitable controller type:
− OFF = controller off
Use control Off to operate controller as a monitor only or to prevent relays from
switching.
− L.CT = limit value control (on/off control).
Use limit control with pumps or valves for fast response
− P/PI = proportional/integral control
Use proportional control to operate your pumps smoothly or for precise control of
proportioning valves. Use PI controller to eliminate steady state error.
Note: please refer to Appendix 4 for detailed information on controller settings.
Press the ENT key to confirm your selection.
− If the controller is set to limit value control (L.CT):
3. Selecting the relay status under Non-Alarm condition: press the ▲ or ▼ key to choose
the desired relay status (de-energized = “DEEN” or energized = “EN”). Press the ENT key to
confirm your selection.
− If the controller is set to proportional control (P/PI):
4. Selecting the proportional controller type: press the ▲ or ▼ key to select the suitable
controller type (“PLC” = pulse length control, “PFC” = pulse frequency control). Press the ENT
key to confirm your selection.
− If the proportional controller type is set to pulse length control (PLC):
5. Selecting the relay status under Non-Alarm condition: press the ▲ or ▼ key to choose
the desired relay status (de-energized = “DEEN” or energized = “EN”). Press the ENT key to
confirm your selection.
6. Setting the proportional range: Press the ▲ or ▼ key to set the proportional range (setting
range: 10 to 500%). Press the ENT key to confirm your setting.
7. Setting the pulse length: Press the ▲ or ▼ key to set the pulse length (setting range: 0.5 to
20 seconds). Press the ENT key to confirm your setting.
8. Setting the integral action time: Press the ▲ or ▼ key to set the integral action time
(setting range: 0.0 to 999.9 minutes). Press the ENT key to confirm your setting.