Meech 977CM User manual

Model 977CM
Pulsed DC Controller
Operating
Manual

Contents
Introduction 3
Inspection 5
Contents 5
Option 5
Features 6
Display 6
Controls 7
Connections 7
Installation 8
Operation 10
Getting Started 10
Setting the Start Voltage and
Ion Output Set Point 10
Setting the Rate 12
Setting the Balance 13
Setting the Alarm Point 14
Locking and Unlocking the Controls 15
Changing the System Set Up 16
Remote On/O󰀨 17
Feedback 18
Feedback Setup 19
Feedback Alarm 20
Maintenance 21
Repairs And Warranty 21
CE Approval 22
Specication 22
977CM Case and Mounting Detail 23
© Meech Static Eliminators Ltd., 26.10.2017 issue 2

Introduction
The Model 977CM Pulsed DC controller is designed to power Meech Industrial Pulsed
DC ionisers, including:
971 Ionising Bar
261 Ionising Nozzle
261 Ionising Flexi-Nozzle
The unit is mains powered with an in-built switchmode 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.
The Pulsed DC output has a maximum voltage of +/- 15 kV and a frequency range of 1
to 20 Hz. Output balance is adjustable from 80%/20% positive/ negative to 20% / 80%
positive/negative.
3

In-built current monitoring maintains optimum ion output by adjusting the output
voltage to counteract the effects of dirt build-up on attached ionising bars and/or
nozzles.
Audible visual and remote alarms alert operators to the need to clean the
ionisers. Analogue outputs enable logging of system performance.
A software lock allows the front panel controls to be locked to prevent
unauthorised adjustment of the ionising system.
An input for a Meech 988 Feedback sensor bar facilitates closed-loop
feedback control of the system, together with outputs for data logging etc.
4

Inspection
The Model 977CM 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. If damage
is evident, do not destroy the carton or packing material and immediately notify the
carrier of a possible damage claim. Shipping claims must be made by the consignee
to the delivering carrier. In addition, please also notify Meech International of any
damage claims that may be made against the delivery carrier.
Contents
The following are included with the 977CM:
1. Instruction manual
2. IEC cable
3. Remote ON/OFF jack plug
Option
1. Interface cable - mini DIN
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6
Features
Display
In normal operation* the LCD display will look similar to the following:
The information displayed is:
1. Power: Peak momentary output voltage in kV. This value is controlled
automatically and will increase and decrease as the system
maintains maximum performance.
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 977CM.
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.
4. Ion Output: Graphical display of system performance with percentage
value.
*Without Feedback sensor bar connected. See Feedback section on page 18 for further information.

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Samples of Meech user interface icons
Samples of Meech user interface icons
Samples of Meech user interface icons
Samples of Meech user interface icons
Controls
Four buttons control the 977CM:
Up: Moves the cursor up and increases numerical values
Menu: Enters and exits the main system menu
Down: Moves the cursor down and decreases numerical values
Tick: Accepts and stores the displayed value.
Connections
1. Mains On/O󰀨 Switch
2. Mains Inlet Socket. IEC-C13
3. Output Signals. 8 Way Mini DIN
4. Remote On/O󰀨. 3.5mm Jack Socket
5. Feedback Sensor Bar inlet. 2.5mm Jack Socket
6. Positive and Negative HT Outputs.
1 2 4 5
3
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Installation
Installation and connection should be completed by a qualified electrical
engineer
This equipment must be grounded /earthed via the mains cable. Failure to do so can
result in damage to the unit.
Locate the 977CM in a dry, well ventilated area. Allow sufficient space for the cables
on the right hand side of the unit.
Mount the unit using the 5mm keyhole mounts on the rear face.

Connect ionising equipment using grey HT connections.
Connect IEC mains cable. Input voltages from 100 to 240V, 50 or 60Hz are
acceptable.
9

Operation
Getting Started
On first use, the 977CM 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.
Setting the Start Voltage and Ion Output Set Point
During installation and commissioning two parameters must be set correctly to allow
optimum performance.
1. Start Voltage. The correct start voltage must be set, depending on the ioniser
connected to the 977CM. The correct start voltages for Meech ionisers are:
971 15 kV
242 10 kV
251 8 kV
261 7.2 kV
271/272/273 7 kV
2. Ion Output Set Point: This is the target Ion Output as measured when the system
is clean. The 977CM self adjusts to try to maintain the output at this level.
This value should only be set when the ionisers have been cleaned,
otherwise the performance of the system will be reduced
During use, ionisers become contaminated which reduces their performance. The
977CM counteracts this by increasing the output voltage to maintain a consistent
performance. The output voltage will automatically be raised up to a maximum of
125% of the pre-set start voltage.
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To set the Start Voltage and Ion Output Set Point
1. Press
Samples of Meech user interface icons
to enter menu
2. Press
Samples of Meech user interface icons
to enter option 1 “Power”
3. Use
Samples of Meech user interface icons
and
Samples of Meech user interface icons
to set voltage to required voltage.
4. Press
Samples of Meech user interface icons
to accept value. The unit will display “Set Ion Output”
Selecting “Yes” and pressing
Samples of Meech user interface icons
will store the Ion Output Set Point.
Selecting “No” will exit setup and leave the set point unchanged.
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Setting the Rate
The 977CM features a variable output frequency. The frequency that should be set
depends on the ionising product and the distance to the target object.
25
Do not use closer
than 150mm
20 20
15
10
5
5
1
0
0.5
100 150 200 250 300 350 400 450 500 550 600
Operating Distance (mm)
Frequency Rate (Hz)
Suggested Frequency Vs Operating Distance for 971/977CM
Ionising Nozzles: Ionising Nozzles and Air Guns (251,261,271) should be used from
10 to 20 Hz.
To set the rate
1. Press
Samples of Meech user interface icons
to enter menu
2. Use
Samples of Meech user interface icons
and
Samples of Meech user interface icons
to select option 2 “Rate”
3. Use
Samples of Meech user interface icons
and
Samples of Meech user interface icons
to set the required value.
4. Press
Samples of Meech user interface icons
to accept value.
Ionising Bars: For best operation at long distance a slow rate should be set.
Conversely at short range, select a fast rate. An approximate guide is as follows:
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Setting the Balance
The output of the 977CM 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.
Changing the balance of the output changes the relative amount of positive and
negative ions produced by the ioniser. With the help of a static locator the balance can
be adjusted for more accurate neutralisation of the target material.
To set the balance:
1. Press
Samples of Meech user interface icons
to enter menu
2. Select option 3 “Balance” and press
Samples of Meech user interface icons
3. Use the up and down button to change the value
4. Press
Samples of Meech user interface icons
to store the setting
+
V
Time
_
50% Positive / 50% Negative
+
V
Time
_
20% Positive / 80% Negative

Setting the Alarm Point
The 977CM features an adjustable alarm that will alert the operator when the Ion
Output of the ionising system falls below a desired level or when a system fault is
detected.
As the ionisers become contaminated, the 977CM increases the output voltage to
maintain maximum Ion Output. When the maximum voltage has been reached and the
ionisers become further contaminated, the Ion Output will slowly start to decrease and
will reduce the system’s performance. At this point the ionisers need cleaning.
To alert the operator to the need for cleaning, the 977CM will trigger an in-built audible
alarm and the LCD screen will ash on and o󰀨. A remote alarm can also be triggered
using the alarm relay connections on the output socket.
The alarm point is set as a percentage of maximum Ion Output. An initial value of 60%
is recommended.
To set the Alarm Point.
1. Press
Samples of Meech user interface icons
to enter menu
2. Select option 4 “Alarm” and press
Samples of Meech user interface icons
3. Use the up and down button to change the value
4. Press
Samples of Meech user interface icons
to store the setting
14

Locking and Unlocking the Controls
The front panel controls of the 977CM can be locked to prevent unauthorised
adjustment of the ionising system. The lock code is a user selected three digit code.
A di󰀨erent code can be chosen each time the unit is locked.
The performance of the ionising system depends on being run at the correct power,
rate and balance. Unauthorised or accidental changes to any of these settings can
greatly reduce its e󰀨ectiveness.
To lock the controls:
Select a three digit lock code. Keep this number safe as you will need it to unlock the
unit at a later date.
5. Press
Samples of Meech user interface icons
to enter menu
6. Select option 5 “Lock” and press
Samples of Meech user interface icons
7. Use the up and down button to change the value of the rst digit.
8. Press
Samples of Meech user interface icons
to move to the next digit and set its value.
9. Finally, press
Samples of Meech user interface icons
to lock the controls.
Note that when locked a Padlock icon will appear at the top of the screen.
To unlock the controls:
1. Press
Samples of Meech user interface icons
to enter menu.
2. Select option 5 “Unlock” and press
Samples of Meech user interface icons
3. Use the up, down and
Samples of Meech user interface icons
buttons to enter the three digit code.
4. Press
Samples of Meech user interface icons
to unlock the controls.
If the three digit code is forgotten or lost, contact your local Meech o󰀩ce or your
Meech distributor to get the Master Unlock Code.
15

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.
The 977CM allows the use of an external Feedback sensor bar to monitor the
accuracy of the system’s static neutralisation. When a Meech 988 Feedback bar is
connected to the 977CM a bar chart on the LCD display shows the residual balance of
static charge on the material after passing the ionising bar. The feedback gain adjusts
the sensitivity of the bar graph. The setting is from 1 to 10. An increase of 1 represents
a doubling of sensitivity of the bar graph.
See the section on Feedback on page 18 for full details of how to use the Feedback system.
The In-built audible alarm can be enabled or disabled to suit the installation.
To set the Feedback gain and audible Alarm operation
1. Press
Samples of Meech user interface icons
to enter menu.
2. Select option 6 “Setup” using the down button and press
Samples of Meech user interface icons
3. Set the desired gain level using the Up and Down buttons and store the value by
pressing
Samples of Meech user interface icons
4. The screen will now display “Buzzer Enabled” .
5. Select “Yes” or “No” using the
Samples of Meech user interface icons
or
Samples of Meech user interface icons
button and press
Samples of Meech user interface icons
to store the
setting.
16

Input/Output Connections
Remote On/O󰀨
The output of the 977CM can be turned on and o󰀨 remotely via the socket located on
the connection panel.
A 3.5mm Jack plug connected to volt-free contacts will allow the 977CM to be switched
on when the contacts are made.
Output Signals
The 8 Way Mini DIN connector o󰀨ers the following outputs:
O󰀨set: When the system is used in feed back mode with a model 988 feedback
sensor bar connected, the o󰀨set output mimics the bargraph on the LCD display. 0
Volts equates to a su󰀩ciently large negative voltage being detected to give full scale
deection to negative. 2.5 Volts equates to no voltage being detected. 5V equates to a
positive voltage large enough to give full scale deection to positive.
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 prewired, 2 or 5 metre, output cable is available upon request. Please, contact
Meech representative for details. Cable connections are as follows:
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Relay Contact
(Volt Free)

18
Funcon 2 Metre Cable 5 Metre Extension Cable
Terminal 1 Ground (0V) Black Orange
Terminal 2 Oset 0-5V Brown Red
Terminal 3 Not Used Red Yellow
Terminal 4 12V (200mA max) Orange Purple
Terminal 5 Ion Output 0-5V Yellow Brown
Terminal 6 Alarm Relay NC Green Green
Terminal 7 Alarm Relay COM Blue Blue
Terminal 8 Alarm Relay NO Purple Black
Diagram Male Plug
Item Code A900-DATA-CAB-2M A900-DATA-CAB-5M
Drawing F
M
M
Feedback
The addition of a Meech 988 Feedback sensor bar can greatly increase the accuracy
of the neutralisation of static charges. By providing closed-loop control of the 977CM
the residual static charges on materials can be minimised despite changing conditions
and machine running speeds. This is particularly useful on rewinds, where large
charges can build up if the ionising system is not adjusted correctly. The feedback
system is primarily intended for use on installations using Meech model 971 Pulsed
DC Ionising bars.
In normal operation, the 977CM operates at a xed rate and balance. The frequency
is set dependent on the distance from the ionising bar to the target material. Using
a static locator (983v2) the charge on the material after it has passed the ionising
bar can be measured. Ideally, the Ion balance of the output can be adjusted by the
operator, to remove all the charge on the material.
In reality, changes in running conditions, materials and cleanliness of the bar means
that this ideal state cannot be reached without constant adjustment of the pulsed DC
controller.
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