Hydro Instruments HC-220 Operation And Maintenance Manual

Pid controller

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HC-220 PID Controller

Operation and Maintenance Manual

The information contained in this manual was current at the time of printing. The most current versions of all

Hydro Instruments manuals can be found on our website: www.hydroinstruments.com

HC-220 Rev. 11/1/18

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Page 1 HC-220 PID Controller Operation and Maintenance Manual The information contained in this manual was current at the time of printing. The most current versions of all Hydro Instruments manuals can be found on our website: www.hydroinstruments.com HC-220 Rev. 11/1/18...
Page 2: Table Of Contents
Operation Mode Flow Chart ..............10 Figure 4 Circuit Board Drawing ................16 RIGHT TO REVISE: Hydro Instruments reserves the right to make engineering revisions and improvements at any time. Please contact Hydro Instruments if there is any discrepancy between the literature and the product provided.
Page 3: Safety Precautions
Hydro Instruments to discuss repair or replacement of the damaged equipment. I. OVERVIEW 1. Modes of the HC-220 – The HC-220 PID Controller has 2 modes that can be accessed. These modes are as follows: a. Conﬁ guration Mode – This mode is used to set up the control and display parameters. (Flow Meter range, Control type, Display units, alarms, etc…)
Page 4: Control Features
See Hydro Instruments’ Modbus Communication Setup document for further details. II. CONTROL FEATURES 1. Keypad Operation – The keypad is used in all three modes of the HC-220. Generally the keys are used as outlined here below. However, detailed instructions will follow.
Page 5: Conﬁ Guration Mode
FIGURE 1 CONFIGURATION MODE...
Page 6 FIGURE 2 HIDDEN SCREENS...
Page 7 III. CONFIGURATION MODE How to Enter: See Section I.2b on page 3. Overview: This mode is used to set permanent control parameters. With the exception of Dosage and Residual (or other) Set Point, all other parameters are set in this mode. NOTE: The following is a ﬂ...
Page 8 3e. Flow at Variable Lag Time. Actually time the lag time and enter the average value for the Flow Meter in units above during this test. The HC-220 will then scale the lag time according to changes in the Flow input signal.
Page 9: Input And Output Calibration
ﬁ nd and enter the PV1 (Flow) and PV2 (Residual) input calibration screens as well as the PO1 output calibration screens. Overview: The analog inputs are calibrated by Hydro Instruments. Should the inputs need to be recalibrated the following steps explain how to calibrate the AI1 through AI4 analog inputs.
Page 10: Operation Mode
FIGURE 3 OPERATION MODE “Flow Pacing” AUTO “Flow Pacing” MANL AUTO FLO -24.9 % MANL FLO -24.9 % AUTO MANL MANL AUTO ¹¹¹¹ 0.0KG/H ¹¹¹¹ 0.0KG/H Set Dosage Set Dosage 0.01 increments 0.01 increments 1.00 1.00 Alarm Status Set PO1(Valve) 0.1 increments None ¹¹¹¹...
Page 11 How to Enter/Exit: See Section I.2a on page 3. Overview: When the HC-220 is in use it should be in this mode. This mode displays input values, output value and alarm conditions. This mode is used to set dosage, Residual (or ORP or pH) setpoint and for manual override of chemical feed rate.
Page 12: Alarm & Output Features
1. 4-20 mA Output – Two 4-20mA outputs are provided at terminals AO1/V- and AO2/V-. These signals are proportional to the chemical feed rate. 2. RS-485 Modbus Communication – This feature allows the HC-220 to be monitored and controlled by a computer. See Hydro Instruments’ Modbus Communication Setup document for further details.
Page 13: Reference Terms
4. Dosage – In the context of ﬂ ow control dosage this is a factor that is multiplied to the incoming ﬂ ow signal. For example, if incoming ﬂ ow signal is at 50% (12 mA) and the dosage is set to 2.0 then the HC-220 will adjust chemical feed to 100% (in Flow Pacing Control) or in the same example if dosage is set to 0.5 the...
Page 14 19. Residual – Refers to either Free or Total Chlorine Residual reading. The units of measure are either mg/l or PPM and it must be a positive number or zero. In terms of the HC-220, discussion is focused on the 4-20mA or 1-5V signal representing the Residual value.
Page 15: Troubleshooting
Lag Times – The lag times set in section III.2.m or III.3.a through III.3.c may be too long for the system. b. Integral – The integral value set in section III.2.l may be too low. If it is too low then the HC-220 will not react quickly enough to reach set point.
Page 16 FIGURE 4 – HC-220 Controller Electronics...