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taneously when pressed. There is no other interaction
with the Model 4400 System in full manual mode.
Grip Control Function Operation
To enable the Grip Control function:
(a) Press [S1] [7]. Read the current state of the Grip Con-
trol function from the Main Panel Display.
(b) The Main Panel Display will show:
"S1 7" if Grip Control is enabled.
"S1–7" if Grip Control is disabled.
(c) Use the [+/–] key to toggle between the enabled and
disabled state.
Pretension and Excess Tension Operation
If the Grip Control function is enabled and Pretension is
enabled, the closure of the lower grip is based on obtain-
ing the load level set by the Pretension Level. Further,
once the lower grip is closed, the load must stay above
the Pretension Hysteresis level and, if it is enabled, be-
low the Excess Tension level. The load level is meas-
ured through the console load weighing system. A load
cell must be installed and calibrated.
The operating sequence starts when the material is
placed in the upper grip. The CLOSE foot pedal is
pressed to close the upper grip. The material is then fed
through the lower grip and pulled to apply pretension.
When the set level is reached, the lower grip closes auto-
matically. The load signal is monitored until a test starts
(by whatever means). If the load falls below the Preten-
sion Hysteresis level, or rises above the Excess Tension
Air Kit Option
6-47
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