Related Manuals for Meech 977HL
Summary of Contents for Meech 977HL
- Page 1 Operating Manual Model 977HL Current Monitoring Pulsed DC Controller for Hazardous Location Ionisers...
-
Page 3: Table Of Contents
Feedback Alarm Specification Maintenance Repairs and Warranty 977HL Case and Mounting Detail Health and Safety CE Approval Products shown in this document may be covered by one or more patents, patents applied for and/or registered designs and/or trade marks. For further information please refer to our Head Office or visit www.meech.com. -
Page 5: Introduction
Introduction The Model 977HL Pulsed DC controller is designed to power Meech 976EX Pulsed DC Ionising Bars in EX Areas The unit is mains powered with an in-built switch mode power supply to allow its use on all mains voltages and frequencies. Display is via a LCD panel with adjustment made by 4 push buttons. -
Page 6: Inspection
An input for a Meech 988 Feedback sensor bar facilitates closed-loop feedback control of the system, together with outputs for data logging etc. The Model 977HL Pulsed DC controller was carefully packed at our factory in a container designed to protect it from accidental damage. Nevertheless, we recommend careful examination of the carton and contents for any damage. -
Page 7: Features
3. Remote ON/OFF jack plug Option: 1. Interface cable - mini DIN Features: Display In normal operation* the LCD display will look similar to the following:... -
Page 8: Controls
2. Rate: Frequency of the output in Hz. The output frequency is operator set according to the type of installation and the ionising equipment connected to the 977HL. 3. Balance: Balance of the Positive and Negative outputs in Percent. The balance can be biased to positive or negative to give the most accurate neutralisation. -
Page 9: Connections
Connections 1. Mains On/Off Switch 2. Mains Inlet Socket. IEC-C13 3. Output Signals. 8 Way Mini DIN 4. Remote On/Off. 3.5mm Jack Socket 5. Feedback Sensor Bar inlet. 2.5mm Jack Socket 6. Positive and Negative HT Outputs. -
Page 10: Installation
This equipment must be grounded /earthed via the mains cable. Failure to do so can result in damage to the unit. 1. Locate the 977HL in a dry, well ventilated area outside the EX zone. Allow sufficient space for the cables on the right hand side of the unit. - Page 11 4. Connect IEC mains cable. Input voltages from 100 to 240V, 50 or 60Hz are acceptable.
-
Page 12: Operation
Operation Getting Started On first use, the 977HL needs to be configured to suit the type of installation and the type of ionising equipment connected to it. This includes basic settings of the Output Power, Rate and Balance as well as alarm functionality and the lock option. -
Page 13: Setting The Rate
Selecting “No” will exit setup and leave the set point unchanged. Setting the Rate The 977HL features a variable output frequency. The frequency that should be set depends on the ionising product and the distance to the target object. Ionising Bars: For best operation at long distance a slow rate should be set. -
Page 14: Setting The Balance
Setting the Balance The output of the 977HL can be biased to negative or positive. The adjustment changes the percentage of time that each HT output is switched on. The maximum bias is 80% to either positive or negative. Time... -
Page 15: Setting The Alarm Point
At this point the ionisers need cleaning. To alert the operator to the need for cleaning, the 977HL will trigger an in-built audible alarm and the LCD screen will flash on and off. A remote alarm can also be triggered using the alarm relay connections on the output socket. -
Page 16: Changing The System Set Up
Press to unlock the controls. If the three digit code is forgotten or lost, contact your local Meech office or your Meech distributor to get the Master Unlock Code. Changing the System Set Up The Set Up option allows the setting of the Feedback gain and controls the operation of the in-built audible alarm. -
Page 17: Input/Output Connections
Input/ Output Connections Remote On/Off The output of the 977HL can be turned on and off remotely via the socket located on the connection panel. A 2.5mm Jack plug connected to volt-free contacts will allow the 977HL to be switched on when the contacts are made. -
Page 18: Output Signals
Ion Output: 0-5V mimics the Ion output bargraph on the LCD display. 5V=100% Alarm: The alarm relay changes state when the system detects an alarm condition, including low ion output. A pre-wired, 2 metre, output cable is available upon request. Please, contact Meech representative for details. Cable connections are as follows: Function... -
Page 19: Feedback
The positioning of the sensor bar is critical. It must be located in such a way that it detects the voltage on the material only and is not influenced directly by the Model 976 Pulsed DC Ionising bar. Your Meech engineer will be able to advise you on this. General examples of positioning follow. -
Page 20: Feedback Setup
3. Use the front panel controls to set the correct output voltage (page 9) and the rate (page 11). 4. The 977HL will now continuously adjust the balance of the output to attain the most accurate neutralisation of charge possible. -
Page 21: Feedback Alarm
Feedback Alarm The feedback system features an alarm that indicates when the system is not neutralising charge within preset limits. The alarm is triggered when the bargraph reaches full scale either positive or negative. The sensitivity of the alarm points can be reduced or increased by altering the Feedback Gain (page 15). -
Page 22: Maintenance
Maintenance The only maintenance required is that the exterior of the 977HL Pulsed DC Controller should be cleaned regularly with a dry cloth to keep it free from dust and other contaminants. Repairs And Warranty The 977HL Pulsed DC Controller is warranted by Meech Static Eliminators Ltd to the original purchaser against defects in material and workmanship for one year after purchase. -
Page 23: 977Hl Case And Mounting Detail
977HL Case and Mounting Detail... -
Page 24: Health And Safety
CE Approval An EC Declaration of Conformity for this product exists in respect of the Low Voltage Directive:72/23/EEC (“LVD”) & Electromagnetic Compatibility Directive: 89/336/EEC (“EMCD”) Health and Safety Emission of Ozone: Considerably below international standard of 0.1ppm. -
Page 25: Meech Static Eliminators Ltd
………………………. Ian Walker, Engineering Manager. Meech Static Eliminators Ltd Offices in: Registered in England No. 1525004 VAT No. GB236 1298 65 • UK • USA • Belgium • Hungary • China... - Page 28 Meech International Meech Static Eliminators USA Inc Meech Elektrostatik SA Meech CE 2 Network Point 2915 Newpark Drive Kaiserbaracke 166 Gábor László utca 2 Range Road, Witney Norton, OH 44203 B-4780 St.Vith Budapest 1041 Belgium Hungary OX29 0YN, UK Tel: +44 (0)1993 706700 Tel: +1 330 564 2000 / 1 800 232 4210 Tel.: +49 (0)6555 3733 399...
Need help?
Do you have a question about the 977HL and is the answer not in the manual?
Questions and answers