FEC DSP1500 (SAN3) - Manual (Page 108)

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enFORCE Operation Manual
6.5 External LVDT Sensor
In applications which require the use of an external sensor to measure when actual part contact is
made and THEN determine what the final press distance would be, the use of an external LVDT is
required. The
enFORCE System allows external distance data to be input from an LVDT
controller via an RS232 connection. This data can then be used to calculate a final target distance
based on actual part location, and not a predetermined distance.
If “LVDT” is selected (Data No. 0F) as the connected equipment, the press system will request
distance data from the LVDT controller when an external signal (Input pin 10) is turned on. The
LVDT controller will then send the measured distance data via RS232 to the Display Unit - DP2
located on the press SAN controller.
(FEC uses SONY LVDT products: Controller: LT10-105C Probe: DT32P)
The Snug Load value (PARM 1-32 D-No. 16) is used for math calculation of the target distance.
The left most digit of this value must be set to “9” to enable this function.
Calculation method:
Final target distance = Standard Distance - (LVDT data x last 3 digits of Snug Load / 100)
Example:
Standard
Distance 200mm
LVDT reading 10mm
Snug Load Setup 9110 (9 enables this function)
So: 200 - (10 x 110 / 100) = 189 New target distance is 189mm
ƒ RS232C data communication speed for communication with the LVDT controller is setup
using PARM 00 - 0A.
ƒ When the LVDT Data Read signal (Pin#10) is turned on, the system will output a BUSY
signal and 0.1 seconds later either the ACCEPT, REJECT or ABNORMAL signal will pulse
for 0.1 seconds to indicate the status of the communication. If the communication was
received successfully, an ACCEPT will be output. REJECT will indicate the
communication timed out. ABNORMAL indicates there has been a communication error.
The Display Panel will display “RS232” during communication and “END” if the communication
was received successfully. (The “RS232” display may be too quick to see in cases where
communication occurs instantaneously) “Err” will be displayed if an error occurred during the
read of the LVDT data.
Chapter 6: System Operation