CDK ELECTRONICS DC68K, User Manual

Page 1: ...nics Ltd equipment and must not be used for any other purpose It may not be copied or its contents divulged without written consent from CDK Electronics Ltd The information contained within this document is believed to be correct on the date of issue CDK Electronics Ltd reserves the right to change features and or specifications without prior notice No responsibility can be accepted by CDK Electro...

Page 2: ...Page CDK Electronics Ltd 17 19 Buxton Road Congleton Cheshire CW12 2DW Tel 01260 296300 Fax 01260 296301 www cdk co uk 2 DC68K Pack Controller Issue 1 1a Sept 2001 This page is intentionally blank ...

Page 3: ...essure Override 5 SYSTEM BACKUP FAILURE MODES 6 INSTALLATION 7 Wiring 7 Power supply 7 Communications Network Connections 8 Communications Address 9 CONFIGURING THE SYSTEM 10 Programming the DC68K 10 System Configuration 10 Adjusting the Control Settings 12 CONTROL SETTINGS 13 DEFAULT CONTROL SETTINGS 16 FINE TUNING THE SYSTEM 17 SYSTEM STATUS 18 SPECIFICATIONS 19 Technical 19 LIST OF FIGURES 20 U...

Page 4: ...C68K to remote serial I O units PACK IO boards A second RS485 serial communications port is provided for communications to a Storescan III alarm panel this link is required for floating the suction pressures For information on programming the DC68K from the Storescan please consult the Storescan manuals The PACK IO boards will relinquish control to the mechanical backup in the event of a power com...

Page 5: ...trol pressure from each PACK IO with the programmed setpoint and deadband Calculations are then made based upon the pressure difference control and differential gain stages available and stages required the remote outputs are then switched appropriately Override setpoints are provided to control excessive pressure swings at both low and high pressures High Pressure Override If the pressure rises a...

Page 6: ...do so will mean that the Storescan will restore the original settings the next time they communicate Note Setting adjustments must be accepted at the Storescan or the original settings will be restored If communications between the DC86K and PACK IO s are lost then a four and a half minute timer is started and during this period no stages are turned off or on If communications have not been re est...

Page 7: ...o serial modules and associated control panels should be arranged in such a manner as to keep the interaction with other equipment through electromagnetic coupling to a minimum guidelines for field wiring are listed below 9 Segregate low voltage cables mains feed cables and 3 phase motor cables from each other ideally in separate trunking or looms 9 Low voltage and high voltage cables should only ...

Page 8: ...ut off the screening foil The white or clear insulated conductor is A the black insulated conductor is B and the non insulated drain wire is the screen Strip about 5mm of insulation from the A and B conductors All but the end of run serial unit require both an in and an out cable wired into the same terminals Twist the appropriate conductors together before fitting to the orange plug Ensure the wi...

Page 9: ...s no function and is reserved for future use The network addresses in the PACK IO s are set using an 8 way dipswitch on each controller Valid addresses are from 1 to 32 Only switches 1 through 6 are recognized for address settings Addressing is achieved using a binary code dipswitch setting 1 2 4 8 16 32 the board address will be the sum of all switch values in the ON position For example to set a...

Page 10: ...ion to set the addresses of the PACK IO s connected to the system System Configuration After selecting the system option from the menu screen the user is prompted for the address for Pack 1 Suction The system will display 1 as a default To change the address press the up arrow to increment the number and the down arrow to decrement the number press the enter key to accept the change The option dis...

Page 11: ...Suction Offset Pack n Discharge Offset Pack n Suction Capacities Pack n Suction Unloaders Pack n Suction Starts Per Hr Suction Capacities This allows different sized compressors to be programmed Suction Unloaders This allows the programming of unloading stages into the system Starts Per Hour Specifies the maximum starts per hour for each compressor Device List This option is only intended for use ...

Page 12: ...djustment and move on to the next setting Each setting can be increased or decreased by using the up and down arrows Using the left and right arrows the cursor can be moved under the hundreds tens or units figures the up and down arrows will then increment in steps of 10 or 100 Note that some settings screens display two figures the number in brackets is the actual pressure reading and the other n...

Page 13: ...ucer GAIN The control or proportional gain setting adjusts the response of the controller to the changes in pressure The gain can be adjusted from 1 to 100 the larger the number the faster the system responds to the pressure change The default value is 6 for suction control and 30 for the discharge control DIFF GAIN The differential gain setting allows the system to react to sharp rises and falls ...

Page 14: ...an the minimum time MIN DOWN TIME The minimum up time specifies the time that must elapse before a stage can be turned off Note that the delay is not used if the current pressure is below the LP Shutdown setpoint or above the HP Override setpoint The default time is 10 seconds the setting can be adjusted from 1 second to 255 seconds but must be less than the maximum time setting MAX DOWN TIME The ...

Page 15: ...ables this function a setting of 1 enables this function RUN INPUT ENABLE This setting controls the ability of the controller to monitor the run inputs attached to the controller It operates in conjunction with the Run Verify Time setting A value of 1 will enable the run inputs and a value of 0 will disable the run inputs RUN VERIFY TIME This timer controls the delay between a compressor starting ...

Page 16: ...The Number Of Output Stages Start Mode 1 1 1 1 0 1 0 Sequential 1 Intelligent Float Enable 0 1 0 1 0 1 Suction Optimisation 1 Enable Run Input Enable 0 8 0 8 0 1 Use Run Signals 1 Enabled Run Verify Time 10 1 10 1 Sec Time From Start to Receipt of Signal Smoothing 1 10 1 10 0 1 Enables damping and Diff Gain Damping 10 1 10 1 Sys System Setting Do Not Adjust Discharge 1 LT 2 H10T 3 LT 4 HT Setpoint...

Page 17: ...rstly choose the preferred control band the relative pressure above the setpoint at which the system should call for 100 or minimum time Divide the transducers pressure range i e 0 100 PSI transducer s full scale is 100 by the preferred control band Set the gain to this figure Set the Dead Band to 1 2 of the control band The DC68K should then be left to control the pack for about 10 to 15 minutes ...

Page 18: ...ks can be viewed on the status screen if the status screen is not currently displayed then press the C or cancel The status screen displays both the suction and discharge pressures along with the current output expressed as a percentage 100 No of stages stages on Use the up and down arrow keys to scroll through all 4 packs P 1 S 4 3 6 0 P 1 D 1 5 8 1 0 0 Actual Pressure Output Percentage Current P...

Page 19: ...pt 2001 SPECIFICATIONS Technical IP20 Steel enclosure Supply Voltage 230VAC 1A 50Hz RS485 serial networking connections 2 x 16 character LCD display output 8 key touch panel Software hardware mechanical or electrical electronic system failures have no disconnection functionality it must therefore be assumed that all working voltages are permanently present ...

Page 20: ...CDK Electronics Ltd 17 19 Buxton Road Congleton Cheshire CW12 2DW Tel 01260 296300 Fax 01260 296301 www cdk co uk 20 DC68K Pack Controller Issue 1 1a Sept 2001 LIST OF FIGURES Figure 1 General Wiring Details ...

Page 21: ...ton Cheshire CW12 2DW Tel 01260 296300 Fax 01260 296301 www cdk co uk 21 DC68K Pack Controller Issue 1 1a Sept 2001 USER MANUAL ISSUE UPDATES Version 1 0 28th June 2000 First Issue Version 1 1a 17th Sept 2001 Preliminary Update for Intelligent Control ...

Page 22: ......