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EZT-570i Technical Manual

 

 

34

 

5.2  GPIB Communications Troubleshooting 

The GPIB communication option is provided through the use of ICS's Model 4899 GPIB-to-Modbus 
Controller.  

The 4899 is an IEEE 488.2 compatible GPIB device that can control Modbus slave 

devices.  It accepts simple GPIB bus commands that are used to create Modbus RTU packets that 
are transmitted serially to the Modbus slave devices, in this case, the EZT.  

 
When this option is provided, it is connected to the EZT’s RS485 serial connection.  For the GPIB 
interface to be used, the EZT must have its serial port mode setting for COM3 set to RS485.  If the 
serial port is not set for RS485, the GPIB interface will be unable to communicate with the EZT and 
communications will not be able to take place. 
 
 

 

 
 

Table 5-3  Common GPIB Communication Problems and Corrective Actions 

SYMPTOM PROBABLE 

CAUSES 

CORRECTIVE 

ACTIONS 

 
GPIB interface not responding to 
read/write commands. 
 

 
4899 power turned off. 
 
Wrong bus address. 
 
Missing termination character. 
 

 
Turn 4899 power switch on. 
 
Verify 4899 GPIB bus address. 
 
Use proper termination character 
(default is LF). 
 

 
Not reading data from EZT. 
 

 
Read command sent to quickly after 
write command. 
 
 
4899 serial timeout set to short. 
 
 
 
Wrong communication port mode on 
EZT. 
 
EZT timeout setting too low. 
 
 
Improper or loose connection. 
 

 
Slow down communication rate 
between write/read commands to 
allow EZT time to respond. 
 
Set 4899 serial timeout to higher 
value.  Use “D ####” command where 
#### = timeout in milliseconds. 
 
Verify proper serial port mode for 
connection used (RS232/485).  
 
Increase EZT timeout setting and/or 
slow down PC communication rate. 
 
Check cables and wiring for loose or 
damaged connections.  Verify proper 
polarity. 
 

 
 

Содержание EZT-570i

Страница 1: ...EZT570i Technical Manual Rev B EZT 570i Technical Manual...

Страница 2: ...4 Dry Air Purge System 22 4 4 1 Dry Air Purge System Failures and Corrective Actions 22 4 4 2 Dry Air Purge System Logic Flow 23 4 5 Altitude System 24 4 5 1 Altitude System Failures and Corrective A...

Страница 3: ...em Redundant Refrigeration 65 7 3 Control Module Status Indicators 67 8 Adjusting EZT Configuration options 68 8 1 Accessing the EZT Configurator 68 8 2 Number of Loops Monitors 71 8 3 Loops Monitor T...

Страница 4: ...nce A WARNING safety alert appears with information that is important for protecting you others and equipment from damage Pay very close attention to all warnings that apply to your chamber 1 2 How to...

Страница 5: ...g for the heater Is there voltage to the heaters Is the heat output of the controller on i e is the solid state relay on to supply power to the heater Is the heater contactor on Is there a blown fuse...

Страница 6: ...tart due to a communications failure or other hardware problems Section 7 Deciphering EZT Input Output I O Operation This section reviews the functionality of the inputs and outputs of the EZT and how...

Страница 7: ...ated humidity sensor the humidity setpoint entered may not match that on the 9300 controller depending upon the current air temperature reading This is due to the temperature compensation algorithm in...

Страница 8: ...at may occur during operation Section 4 3 Auxiliary Cooling System This section covers typical problems that may arise with the chamber s auxiliary cooling system It includes information regarding the...

Страница 9: ...re heaters and their surface is not electrically live This allows a temperature sensor typically a thermocouple to be placed on their surface The sensor is then connected to a limit device This limit...

Страница 10: ...ines how system 1 is controlled in order to cool system 2 With standard defrost the system 1 compressor is cycled on and off based on system 2 head pressure With large horsepower defrost system 1 comp...

Страница 11: ...dditional inputs and outputs are used to start and stop the air circulators on plenum B Q44 as well as monitor for heater over temperature I4 motor overload I5 and a second boiler system on the additi...

Страница 12: ...defrost if equipped Turn on chamber event Altitude above controllable limit for temperature Decrease altitude or turn off altitude system Replace fuse Check heater limit Maximum temperature reached Ve...

Страница 13: ...r in defrost if equipped Refrigeration system capacity exceeded Turn on chamber event Altitude above controllable limit for temperature Decrease altitude or turn off altitude system Initiate defrost o...

Страница 14: ...EZT 570i Technical Manual 14 4 1 6 Conditioning System Logic Flow...

Страница 15: ...EZT 570i Technical Manual 15...

Страница 16: ...for the system B refrigeration system is the same as that shown in the chart above for a standard chamber with a single refrigeration system The logic is merely duplicated and tied to different output...

Страница 17: ...r The humidity system will restart automatically once the air temperature returns to within the set temperature range Dewpoint Limits In order to protect the refrigeration system and chamber from dama...

Страница 18: ...d Atomizer water supply low Atomizer air supply low Check system status monitor Chamber operating at maximum humidity level Check water supply Allow time for boiler to heat up Replace fuse Verify prop...

Страница 19: ...EZT 570i Technical Manual 19 4 2 2 Humidity System Logic Flow...

Страница 20: ...Cool Control Operation When auxiliary cooling is set for control in the configurator the auxiliary cooling system will operate according to the boost control logic until the low limit set point is rea...

Страница 21: ...EZT 570i Technical Manual 21 4 3 2 Auxiliary Cooling System Logic Flow...

Страница 22: ...oints and calculates the resulting dewpoint When this value is below the standard wet coil range the EZT will automatically switch to frozen coil mode The EZT does not initiate frozen coil mode until...

Страница 23: ...EZT 570i Technical Manual 23 4 4 2 Dry Air Purge System Logic Flow...

Страница 24: ...ooling is shut down During the allowed operating range the air circulator motors will switch from low speed output Q2 to high speed output Q44 once the high speed fan enable set point is reached This...

Страница 25: ...EZT 570i Technical Manual 25 4 5 2 Altitude System Logic Flow...

Страница 26: ...nd cooled as it flows across the heater and heat exchanger much like the air across the heater and evaporator in a typical chamber For TSB s with fluid pumps the fluid system is equipped with safeties...

Страница 27: ...w or no fluid flow Blockage in piping closed valves Pressure relief valve bypassing fluid Pump failure Blown fuse Locate blockage and remove open valves Check pump pressure Adjust replace relief valve...

Страница 28: ...nues to push on the basket thus sealing the gasket surface to keep the hot and cold chambers separate Limit switches are positioned on each end of the cylinder in order to identify the basket position...

Страница 29: ...EZT 570i Technical Manual 29 4 7 2 Transfer System Logic Flow...

Страница 30: ...EZT 570i Technical Manual 30...

Страница 31: ...e 5 1 Web Server Modbus VNC Communication Settings For more detailed information on communication format commands and functionality of the 232 485 serial interfaces see the EZT 570i User Communication...

Страница 32: ...t with a default address of 1 and Even parity Even parity is required when using CSZ EZ View software to communicate with the EZT The baud rate data bits and stop bits of the serial interface are fixe...

Страница 33: ...also have its parity set to Even in order for EZ View to communicate with it Controllers must be enabled in order If a controller is skipped it will not cause a direct communication error however the...

Страница 34: ...able to take place Table 5 3 Common GPIB Communication Problems and Corrective Actions SYMPTOM PROBABLE CAUSES CORRECTIVE ACTIONS GPIB interface not responding to read write commands 4899 power turned...

Страница 35: ...server To use either interface you must use the assigned IP address to access the EZT 570i To obtain the correct IP address go to the Web Server Modbus VNC screen under the chamber setup menu Enter th...

Страница 36: ...information gathering and monitoring of chamber operations only The information is exchanged over an RS232 serial communication link between the HMI and the EZT 570i s control module CM mounted on th...

Страница 37: ...lication not starting SD card missing improperly inserted or erased Windows CE startup directory not properly configured Verify SD card is inserted properly Check SD card for EZT570i operating files C...

Страница 38: ...C minimum 500ms scan rate 4 Screen Locked Up Screen does not respond to touch Touch screen out of calibration VNC server not properly disconnected after previous access via remote PC HMI operating tem...

Страница 39: ...files however we are only concerned with the Startup folder If the startup folder does not exist then it must be created If the startup folder does exist open the folder and make sure there is a shor...

Страница 40: ...on the splash screen The hour glass will continue to turn and the COM LED on the HMI will flash as it tries to communicate with the CM Figure 6 3 Write Error on Boot To check the serial port settings...

Страница 41: ...mmunications and its mode does not affect the communications between the HMI and control module Figure 6 6 Serial Port Settings Set the serial port mode for COM1 to RS232 by touching the radio button...

Страница 42: ...switch 1 to the on up position Restore power to the EZT Allow the HMI to follow its normal boot sequence Once the Windows CE image is loaded the display will automatically start the touch screen cali...

Страница 43: ...like using a desktop PC Begin by selecting Chamber Setup from the main setup menu Figure 6 8 Setup Menu Access Select System Maintenance from the setup menu Figure 6 9 Chamber Setup Menu Access You w...

Страница 44: ...ance Setup menu Access Press the Yes button to proceed to the CECP utility Figure 6 11 Calibrate Touch Press the Touch Screen icon on the CECP settings screen and then press Calibrate to start the cal...

Страница 45: ...where on the screen to accept the settings and complete the calibration routine Do not use any metal or sharp edged instruments on the screen or permanent damage to the screen may result Figure 6 13 T...

Страница 46: ...CHAMBER HOT CHAMBER BATH ON LEFT CHAMBER 2 HUMIDITY COLD CHAMBER CENTER CHAMBER 3 AUX COOL AUX COOL AUX COOL 4 PURGE PURGE PURGE 5 ALTITUDE XFR HOT XFR LEFT 6 XFR COLD XFR RIGHT 7 XFR UNLOAD RIGHT CH...

Страница 47: ...Technical Manual 47 7 1 Standard Input Configuration Dual Refrigeration refers to a refrigeration type selection of tandem or redundant meaning there are two duplicate refrigeration systems cooling th...

Страница 48: ...larm is acknowledged silence button pressed on alarm monitor screen and the input is no longer active requires manual reset of motor overload It may also be used to indicate a failure of a VFD if one...

Страница 49: ...ven sufficient time to fill 30 minute delay upon turning on the humidity event If the boiler has not filled up in the allotted time the alarm will sound Once the boiler has reached the proper operatin...

Страница 50: ...equipped This input is active low i e the input must be off in order for the alarm to be indicated When active input off the EZT shuts down the chamber until the alarm is acknowledged silence button p...

Страница 51: ...ignaling that the coil defrost temperature has been met When the input first turns on the EZT will begin the 15 minute countdown to terminate defrost The thermostat is typically set for about 10 C 50...

Страница 52: ...cknowledged silence button pressed on alarm monitor screen and the input is off Fluid Flow Safety I46 The fluid system flow safety input is used to indicate that the fluid system has proper flow LC ch...

Страница 53: ...wn position There is no user indication for this input TSB Pump Pressure Safety I45 The pump pressure safety input is used on TSB s to indicate that the hot or cold bath fluid pump has exceeded its ma...

Страница 54: ...The system B hi lo pressure safety input is used to indicate that the system 1B or system 2B compressor has exceeded its high or low pressure operating range This input is active low i e the input mu...

Страница 55: ...ut is used to indicate that the system 1A or system 2A compressor protection module has detected an improper phase condition loss or the compressor motor windings have overheated if equipped This inpu...

Страница 56: ...a 60 second prechill timer will begin At the end of 60 seconds the chamber will return to normal operation If the control loop is not calling for 100 cooling the prechill timer will begin its 60 secon...

Страница 57: ...a boiler on each plenum Thus this input is used to indicate that the boiler on plenum B has overheated This input is active low i e the input must be off in order for the alarm to be indicated When a...

Страница 58: ...EZT 570i Technical Manual 58 7 2 Standard Output Configuration...

Страница 59: ...utput also turns on and off with the pressure switch input I32 if pumpdown is enabled If main power is off for more than 30 minutes the input will be ignored and the output will remain off until pumpd...

Страница 60: ...can be pumped down During normal cooling operation this output will turn on with the system 1 compressor output Q3 When the refrigeration system is no longer required to run this output will turn off...

Страница 61: ...ay time set in the configurator Rate Master Control Q40 This output is used for rate master refrigeration systems It is used to switch cooling control between the system 1 and system 2 valves When the...

Страница 62: ...and is used to turn the RC blower on and off when the chamber is on and event 8 is turned on and off If defrost is enabled this output will turn off the blower during defrost and will turn it back on...

Страница 63: ...t Hi Speed Fan Enable SP in the configurator this output turns on When the altitude drops below the set point this output turns back off so the low speed fan output Q2 can turn on and control the air...

Страница 64: ...the door from being opened during a transfer When the transfer is complete the output turns off Transfer Left Q32 This output is used to turn on the transfer mechanism to move the basket to the left o...

Страница 65: ...ystem 1B when the unit is equipped with pumpdown This allows the solenoids to open and close independently of system 1B compressor operation so that the system can be pumped down During normal cooling...

Страница 66: ...The output turns off when system 1B output turns off During single stage humidity operation the output is also turned off The output will remain off until humidity is turned off The stager start time...

Страница 67: ...hat means that the inputs and outputs increment in groups of 8 and are assigned sequentially as the input and output cards are added The first group of inputs is I0 I7 on the CPU while outputs are Q0...

Страница 68: ...e EZT Configurator To access the EZT configurator you must quit the EZT570i application and start the configurator program To do this you must have the proper security access to exit the EZT applicati...

Страница 69: ...dows CE desktop blue screen Insert the SD card back into the slot in the HMI making sure to insert it in the proper orientation Touch the thin gray bar at the bottom of the screen to show the Windows...

Страница 70: ...Figure 8 4 EZT570i Folder Select EZT570i Config from the EZT570i folder to start the configurator program Figure 8 5 EZT570i Config When the configurator application starts it will default to the Num...

Страница 71: ...op is selected and enabled disabled If a loop is being removed you must first change the loop to disabled and then change the total number of control loops Only changing the number of control loops wi...

Страница 72: ...f control loop temperature humidity altitude etc Do not alter the loop type to any selection other than what is called out on the EZT Configuration form supplied with the chamber or the chamber may no...

Страница 73: ...will turn on The EZT automatically assigns the digital outputs of additional relays cards for specific options as enabled in the configurator For a standard dry chamber non humidity that does not hav...

Страница 74: ...or the pump with event 1 and enables the input alarm logic for high temperature I44 pressure I45 and flow I46 monitoring VTS Logic Enabled Enables the logic for basket position and dual zone control L...

Страница 75: ...and Q47 used to control the up and down movement Events 5 hot and 6 cold with event 7 for the unload position are used to select the three positions Inputs I6 and I7 are used to monitor the left hot...

Страница 76: ...ase selections include Single Stage selection for standard single stage systems typically R404a Tundra selection for single stage systems using R410a Cascade selection for standard cascade systems Rat...

Страница 77: ...rost On is used for smaller compressors typically smaller than 7 5hp Large HP Defrost is used for larger systems typically larger than 7 5hp The large horsepower defrost is used to control the cascade...

Страница 78: ...ation system will only operate in cascade mode For Tundra systems this setpoint defines the chamber air temperature below which the maximum cool output of the EZT is disabled Refrig Settings These but...

Страница 79: ...undra II systems to set the mnimum superheat allowed at the suction of the compressor to prevent liquid floodback from damaging the compressor The Tundra Floodback Alarm must be enabled for this setti...

Страница 80: ...e systems that run in single stage mode during humidity have separate RH cooling circuit on system 1 Cmp On Sets the loop percentage of output required to enable the refrigeration system in order to p...

Страница 81: ...algorithm in the EZT depending on whether or not a compensated sensor is used The compensation is for a Vaisala HMM30C sensor only Do not use it for other brands of sensors This should be disabled whe...

Страница 82: ...frozen coil option is installed Min Dewpoint Limit Sets the minimum dewpoint that the chamber will control to In essence this limits the minimum humidity level that the chamber can achieve at a given...

Страница 83: ...ature operation which go colder than the range of the refrigeration system Boost Cool Temp SP Disable Sets the temperature below which the refrigeration system is automatically disabled if aux cool co...

Страница 84: ...ble buttons Parameter Descriptions Window Heater Enable SP Sets the temperature below which the window heater turns on Alt Hi Speed Fan Enable SP Sets the altitude in Kft above which the high speed fa...

Страница 85: ...Figure 8 15 CSZ Event Names To change or edit a tag name touch the position for the event and change the name using the pop up keypad Note that event names are limited to 20 characters in length Alter...

Страница 86: ...he chamber Figure 8 16 Critical Chamber Alarm Names To change or edit a tag name touch the position for the alarm and change the name using the pop up keypad Note that alarm names are limited to 20 ch...

Страница 87: ...tem alarms Figure 8 17 Critical Refrigeration Alarm Names To change or edit a tag name touch the position for the alarm and change the name using the pop up keypad Note that alarm names are limited to...

Страница 88: ...rvice monitors Figure 8 18 Non Critical Alarm Names To change or edit a tag name touch the position for the alarm and change the name using the pop up keypad Note that alarm names are limited to 20 ch...

Страница 89: ...m component Figure 8 19 Maintenance Alarm Names To change or edit a tag name touch the position for the alarm and change the name using the pop up keypad Note that alarm names are limited to 20 charac...

Страница 90: ...plication Figure 8 20 Special Settings Names To change or edit a tag name touch the position for the alarm and change the name using the pop up keypad Note that alarm names are limited to 10 character...

Страница 91: ...ou must rotate the small pot on the control module CPU Figure 8 21 EEPROM Configuration Back up Gently turn the pot full counterclockwise then fully clockwise and back counterclockwise again The small...

Страница 92: ......

Страница 93: ...EZT 570i Technical Manual 1 Appendix...

Страница 94: ...ion Screen 45 Figure 7 1 Control Module Input Output Indicators 67 Figure 8 1 Exit Application 68 Figure 8 2 Windows Start Menu 69 Figure 8 3 Storage Card 69 Figure 8 4 EZT570i Folder 70 Figure 8 5 EZ...

Страница 95: ...Corrective Actions 32 Table 5 2 Common EZ View Start up Problems and Corrective Actions 33 Table 5 3 Common GPIB Communication Problems and Corrective Actions 34 Table 5 4 Common Ethernet Communicati...

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