Manufacturer and distributor of liquid handling systems.

 
 
        

Durant Preset Troubleshooting

General

Most problems encountered when applying the control are due to wiring errors, improperly set Function codes, and sensors which are not correctly installed.  This section provides guidelines for the detection and correction of these types of problems.  Additionally, a description of the diagnostic program included in the control is discussed.
 
CAUTION

BEFORE APPLYING POWER TO THE EQUIPMENT, RECHECK ALL WIRING TO INSURE PROPER CONNECTIONS.  MAKE SURE THE AC LINE VOLTAGE IS CONNECTED ONLY TO SCREW TERMINALS #25, #26, #27 AND #28.  CONNECTING AC POWER TO ANY OTHER SIGNAL TERMINALS WILL CAUSE SEVERE DAMAGE TO THE CONTROL.
 
PROBLEM POSSIBLE CAUSES REMEDIES
Display does not light when AC power is turned on. 
  1. No power applied on terminals #25, #26, #27 and #28
  1. Check wiring, fuses and primary AC power source
 
  1. Short between terminals #19 or #20 and DC Common
  1. Check jumper installation
 
  1. Terminals #25, #26, #27 and #28 improperly jumped.
 Immediately disconnect AC power supply & check wiring.
  
Counter does not increment or decrement when sensor is activated
  1. Sensor malfunction, improperly installed or connected.
  1. Check sensor wiring, installation and operation.
 
  1. Incorrect count mode selected for type of sensor being used.
  1. Check function code diagram for proper value selection for Function 60.
 
  1. Reset input (terminal #17) connected to DC Common.
  1. Check wiring.
 
  1. Low frequency select terminals (terminals #11 and #13) connected to DC Common when sensor generates count pulses less than 1 millisecond long.
  1. Disconnect low frequency terminals.
  
Counter counts in wrong direction.
  1. Quadrature shaft encoder outputs A and B reversed.
  1. Reverse wiring on inputs 1 and 2 (terminals #14 and #10)
 
  1. Add and Subtract signals reversed.
  1. Reverse wiring on inputs 1 and 2 (terminals #14 and #10)
 
  1. Improper count mode selected for sensor configuration utilized.
  1. Check Function Code diagram for proper value selection for Function 60.
 
  1. Polarity of up/down control signal reversed when Count With Direction Control mode is selected.
  1. Invert up/down control signal on terminal #10 with an external relay or transistor.
 
Counter accumulates too many counts.
  1. Electrical noise causing extra counts.
  1. a.  Check sensor lead installation to insure they are not bundled with other power wiring.
   
  1. b.  Connect low frequency select terminals (terminals #11 and #13) to DC Common if pulses from the sensor are longer than 1 millisecond.
   
  1. c.  Use shielded cable for wiring sensors to Count Inputs (terminals #10 and #14) and connect the shield to terminal #32. 
 
  1. Loose wires between sensor and count inputs.
  1. Check external sensor wiring.
 
  1. Sensor generating extra pulses due to vibration, oscillation, chatter or jitter.
  1. Check sensor mounting and motion of machine to determine if these characteristics cause extra counts.  Use Quadrature encoders where applicable.
 
No printout or incorrect printout is generated when the control is connected to a printer.
  1. No AC power applied to printer
  1. Check AC power connections and fuse in printer.
 
  1. Printer improperly set up.
  1. Check printer DIP switches for correct setup. (See printer operation manual.)
 
  1. Serial communications output incorrectly set up.
  1. Check the SDO+ (terminal #36) on control is connected to SDI- on printer and SDO- (terminal #35) is connected to SDI+.  
 
  1. Baud rates of control and printer not set up to the same value.
  1. Check that the Baud rates of the control and printer are the same.

 
 
 
Last Updated: 12/21/2006

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Murray Equipment, Inc. 2515 Charleston Place Fort Wayne, Indiana 46808

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