Holtgreven GSE-375 - Manual (Page 50)

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Pre-Acts (Discharge)
Pre-act 1 is used for dual-speed dispensing. Pre-act 1 specifies when the system should switch
from fast-discharge to slow-discharge. When using a single-speed device, pre-act 1 should be set
to 0 from the Setup Mode. P5114 should also be disabled to prevent pre-act 1 from appearing as
a subset of the target in the Weigh Mode. Pre-act 2 specifies the point where the final cutoff
should occur, regardless of a single-speed or dual-speed operation. See Pre-acts (General) on
page 37 for details on the operational functions of pre-acts.

Pre-act 1 controls setpoint 2. Pre-act 2 controls setpoint 1.
Learn Feature (Discharge)
Pre-act 2 has the learn feature available which allows the Model 370/375 to automatically adjust
the final cutoff based on changing environmental conditions. See Learn Feature (General) on
page 37
for learn feature details.
Pause Feature (Discharge)
The standard pause feature (keypress, remote key closure or both) is available for the discharge
operation. See Pause Feature (General) on page 37 for pause function details.
When Discharge is configured in the setpoint setup, Targ1 automatically becomes an available
mode for the [SELECT] key. An entry followed by [TARE] or [SAMPLE] changes Targ 1.
Pressing [TARE] or [SAMPLE] alone allows access to the subsets. PA 1 and PA 2 are the
subsets for Targ 1. The pre-acts can be deleted as subsets by choosing 'disabled' at P5114 and
P5115. See Changing Targets from the Weigh Mode (General) on page 38 for instructions on
changing target values from the Weigh Mode.
 Target and pre-act values are entered as positive values.
If the total amount of product in the weigh vessel is less than the entered target, the Model
370/375 will prompt “Tare ~ =Cont”. Pressing [TARE] will dispense whatever is left in the vessel.
Pressing any other key will abort the discharge cycle to allow for refilling the vessel.
Example (Discharge)
With a system set up to dispense ball bearings from a 50,000 lb weigh-bin and the fast-feed
requiring an early cutoff to slow-feed, the following settings might be used to achieve accurate
dispensing of 1000 bearings:
Parameter Setting Actual Cutoff Value Comments
Targ 1 = 1000 0 – 1000 = (-1000)
Desired quantity (decreasing value from a net zero: enter as
a positive value).
Based = Qty Targets are compared to quantity (P170 Enabled).
PA 1 = 200
1000 – 200 = 800
0 – 800 = (-800) Switch to slow feed at –800 bearings (decreasing value from
a net zero: enter as a positive value).
Start = [TARE] Start discharge with [TARE].
PA 2 = 15
1000 – 15 = 985
0 – 985 = (-985)
Final gate begins closing at 985 bearings. Delayed closure
brings final quantity to 1000 (decreasing value from a net
zero: enter as a positive value).
Learn 2 = Enabled Analyze five previous operations and auto-adjust Pre-Act 2.
PrAc 1 = Enabled Pre-act 1 available as subset of Targ 1 in Weigh Mode.
PrAc 2 = Disabled
Pre-act 2 NOT available as subset of Targ 1 in Weigh Mode
(auto-adjust only).
Pause – Remote Remote key closure invokes Pause.