Apply the calibration resistor – Rockwell Automation 1746-MPM INSTALL INSTRUC MOLD PRESSURE User Manual

Page 11

Mold Pressure Module

Publication 1746-5.13 July 1998

6. Set sensor inputs to zero

If using a sensor input, zero the channel to cancel any pre-load or offset

voltage in the sensor. For mold pressure, zero the channel every machine

cycle. The method to zero the channel depends on the type of sensor.

7. Check channel operation

With DartWin software on your PC, use the calibration resistor to check

channel operation. The sensor must be connected. (See Cal R in Section 4.)

Apply the calibration resistor.

For this type of sensor:

Zero it: with:

With this method:

hydraulic pressure (lo-level),
or injection pressure (hi-level)

a jumper, manually

momentarily short “zero” terminal (4) to
“shield” terminal (5 or 6) after wiring,
once at setup.

mold pressure (lo-level)

ladder logic
(channel selectable)

each machine cycle, toggle bit 04 (chnl 1)
or bit 05 (chnl 2) in output image word 0
(Rising-edge enabled, may remain ON for
the cycle, typically triggered on the mold-
closed bit (trigger 4).)

autozero feature of
DARTWin software
(channel selectable)

enabled on DARTWin’s Mold Setup screen
Software stores first value and subtracts it
from subsequent values any machine cycle.

both types (channels 1, 2)

Each method works independently. While “zero” is ON, module
returns status bit 09 (chnl 1) or 10 (chnl 2) in input image word 0.

configured:

with

resistor

connect to module terminal block:

for internal
cal resistor

in module
(200K)

a) short “Cal” (terminal 3) to “Shld”
(terminal 5 for channel 1 or 6 for channel 2)

for external
cal resistor

in sensor

b) cal resistor between “Cal R” and “Cal”
(between terminals 7 & 9 for channel 1,
or terminals 8 & 10 for channel 2)

separate
from
sensor

c) make two connections:

•

resistor between “Cal R” and “+Sgnl”
(between terminals 7 & 13 for channel 1,
or terminals 8 & 14 for channel 2)

•

jumper wire between “Cal” and “+Exc”
(between terminals 9 & 11 for channel 1,
or terminals 10 & 12 for channel 2)

+T/R

Cal

Shld

Cal1 R

+Exc 1

-Exc 1

+Sgnl 1

-Sgnl 1

Cal 1