Summary of Contents for KELCO T20
- Page 1 KELCO T20 TIMER INSTALLATION & PROGRAMMING INSTRUCTIONS KELCO Engineering Pty Ltd Sydney Australia www.kelco.com.au...
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Page 2: Table Of Contents
Blackout or Brownout..............6 Cable Gland Assembly..............7 The Heavy Duty (HD) Terminal............8 Electrical Limitations..............9 Circuit Diagrams................10 The 12VDC T20 Timer..............14 T20 Controls and Terminals............15 Remote Flow Switch Input............. 17 Suitable Flow Switches..............19 Purging the T20................20 Programming the T20 Timer............ -
Page 3: Warning Symbols Explained
This symbol is intended to alert the user to the presence of important operating and maintenance instructions in the lit- erature accompanying the T20 timer WARNING This symbol is intended to alert the user to the presence of un-insulated “danger- ous voltage”... -
Page 4: Important Safety Instructions
WARNING Please read these installation and operating in- structions carefully and fully before installing or servicing this timer. The T20 is a mains voltage device. Death or serious injury may result if this product is not correctly installed and operated. -
Page 5: Overview
The T20 can also be programmed to simulate a complex pump control panel. This document sets out in detail the installation and functions of the T20 timer and some of the main ways in which it can be used in pumping and irrigation systems. -
Page 6: Installing The T20
Installing the T20 The T20 timer is supplied as two separate assemblies, the wall mounting bracket and the electrical housing. The mounting bracket should be installed first by securing it to a wall or to a plate attached to the pipework or pump. The drilling pattern is shown below. -
Page 7: Electrical
Jogging can snap the main spindle of a pump very easily, so please take all precautions to ensure the voltage supply to the T20 is stable and that the current carrying capacity of the cable used is adequate for the job. -
Page 8: Blackout Or Brownout
Brownout Or Blackout If a blackout or brownout occurs the T20 timer will not retain memory of where in its run or stop cycles it may have been. When power resumes, the T20 will reboot and resume running. A manual reboot can be done at any time by pressing the timer’s reset button. -
Page 9: Cable Gland Assembly
Cable Gland Assembly Relays The T20 timer houses 2 relays. The contacts of both relays are voltage free and are normally open. The relays are marked Relay 1 and Relay 2 on the terminal block. Relay 1 is the primary relay and is used to control the pump motor. It has an electrical rating of 30 Amps (resistive) at 240VAC. -
Page 10: The Heavy Duty (Hd) Terminal
HD drive be used whenever the timer is used to directly control a pump motor. The HD drive should not be used when the T20 is connected to external timers, contactors, relays or to any other external device where voltage free con- tacts are required. -
Page 11: Electrical Limitations
WARNING Do not connect any supply greater than 25VAC or DC to the LV terminal on the T20 timer. The LV terminal is only for use with a low voltage supply of less than 25V AC or DC. If a voltage... -
Page 12: Circuit Diagrams
The following pages give some examples of ways the T20 timer can be wired. Please note all electrical work associated with the T20 timer must be car- ried out by suitably qualified electricians and must conform to AU/NZ wiring rules. - Page 13 LOW VOLTAGE AC CONNECTIONS 18 to 25VAC SUPPLY RELAY CONTACTS ARE VOLTAGE NEUTRAL FREE AND CAN BE USED TO SWITCH A CONTACTOR OR TO DIRECTLY CONTROL A PUMP MOTOR. SEE TEXT ACTIVE FOR INFORMATION ON THE LIMITA- TIONS OF THE RELAY CONTACTS AND HOW TO USE THE HD TERMINAL.
- Page 14 CONTROL OF A SINGLE PHASE PUMP MOTOR WITH REMOTE FLOW SWITCH INPUT AND AN EXTERNAL ALARM THIS LINK MUST BE USED WHEN- ACTIVE EVER THE TIMER IS DIRECTLY MAINS VOLTAGE SUPPLY CONTROLLING A SINGLE PHASE 220VAC to 240VAC PUMP MOTOR, AS SHOWN HERE. NEUTRAL PUMP MOTOR...
- Page 15 CONTROLLING A 240VAC SINGLE PHASE PUMP MOTOR WITH THE T20 TIMER POWERED FROM A LOW VOLTAGE AC SUPPLY THIS LINK MUST BE USED WHENEVER THE CONTROLLER IS DIRECTLY CONTROLLING A SINGLE PHASE PUMP MOTOR, AS SHOWN NEUTRAL HERE. 18 to 25VAC SUPPLY...
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Page 16: The 12Vdc T20 Timer
However, the timer will simply not operate unless the supply polarity is correct. When connecting a remote flow switch to the 12VDC T20 timer the supply to the flow switch must be taken from the positive terminal on the T20 timer. The flow switch and its connecting circuit will operate at 12VDC. -
Page 17: T20 Controls And Terminals
T20 Controls and Terminals... - Page 18 Use this button when programming the T20 to enter Down Button data. It also turns on the LCD backlight. This button reboots the T20 timer each time it is Reset Button pressed. Flow Status Light This light is green whenever flow is detected and red (Red or Green) when no flow is detected.
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Page 19: Remote Flow Switch Input
An external flow switch with voltage free contacts or a set of external relay con- tacts can be used to start and stop a pump under the control of the T20. The supply to the external switch must be taken from the (LV) terminal (Low Voltage active terminal) of the T20 timer when the timer is powered from the mains or from a 24VAC source. - Page 20 The cable resistance refers to the total resistance out to the remote flow switch and back again, as measured at the T20 timer across the 2 remote flow switch connection wires with the flow switch contacts closed.
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Page 21: Suitable Flow Switches
Suitable Flow Switches The flow switches listed below all use reed switches as their output device and are suitable for use with the T20 timer. Paddle flow switches Inline flow switches with Trailing wire flow Switch- with BSP or NPT threads... -
Page 22: Purging The T20
(R) again and run the pump. Introduction to Programming The T20 flow switch timer includes a set of functions that can be set up to control a pump. The functions range from a simple override on start timer that allows a pump to start in spite of an initial lack of flow, through to a range of sophisticated timing and flow based sequences. -
Page 23: Programming The T20 Timer
3) Set realistic and sensible values into the various functions. For example, do not set a pump to cycle on and off rapidly. Always set the T20’s running and stop- ping times to realistic values. -
Page 24: Basic Operation
“NO” and press (P). You will then be asked to confirm your choice and press the (R) reset button to run the pump. If you select “NO” to the confirmation question the T20 will step back to the top of the menu and allow you to change whatever settings you want. -
Page 25: T20 Table Of Limitations
T20 Table of Limitations Ambient Temperature Range 1ºC to 50ºC Ingress Protection Rating IP67 Adjustable from 1 second to 4 minutes Start-up Timer in 1 second increments. Adjustable from 1 second to 15 minutes Run-on Timer in 1 second increments. -
Page 26: Advanced Functions
Each time the T20 is switched on it boots up but prevents the actual starting of the pump for the set period. As soon as the set time has elapsed the pump will start and run normally. -
Page 27: Batch Control
Set up this way the T20 will run for whatever time you have entered into the cyclic running run time and will then stop. This batching process can be... -
Page 28: Delayed Restarting
T20 will sense no flow because the float valve will still be closed. The T20 will then shut down the pump and again wait for 12 hours before attempting to start the pump. Using this technique prevents the pump from hunting on and off when the tank is full because of slight leakage from the float valve or pipework. -
Page 29: Cyclic Running
If a run time is set to some value and the stop time is left set at zero, the T20 will behave as a one-shot batch controller. On pressing the reset button or switching the pump on, the pump will run for the set period and then shut down. -
Page 30: Anti-Cycling
If the starts per hour rate is exceeded 10 consecutive times in any one hour period the pump will be automatically shut down and the T20 will display a message indicating the starts per hour rate was exceeded. -
Page 31: Burst Pipe Detector
Burst Pipe Detector The T20 timer includes a system for detecting burst pipes. It is most commonly used in systems that are set up as a pressure system and are controlled by an external pressure switch. If a pressure system bursts its discharge pipe the system pressure will fall and the pump will start at its low pressure setting. -
Page 32: Lcd Screen Backlight, Program Lock
P and prevents access to the T20’s menu. To lock or unlock the T20, press the up and down buttons together while the pump is in normal operation (not while it is being programmed). Pressing the up and down buttons together while in normal running mode shuts down the pump and opens the timer’s lock screen. -
Page 33: Warranty
PLEASE NOTE Kelco Engineering Pty Ltd reserves the right to change the specification of this product without notice. Kelco Engineering Pty Ltd accepts no liability for personal injury or econom- ic loss as a consequence of the use of this product. All rights reserved copyright Kelco Engineering Pty Ltd © 2014...
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