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Chapter 15
Functions
Rev. 1.00.05
Subject to technical changes
15.7 Auto Standby
The function is configured in hot runner controller.
For a digital input (Input 1...2) is specified whether a positive edge (15-Auto Standby high edge) or a negative
edge (16-Auto Standby low edge) is used for triggering of the function.
By the system parameter
[SP11]Auto Standby Time (page 193) is specified, in which time the controller ex-
pects a start signal from the injection molding machine.
Note: This time must be specified in any case longer than the cycle time of the process.
Control
[P007]Standby setpoint value (page 191).
Note: Factory setting for lowering of temperature is by this value (= relative). Should be lowered to a fixed value,
so this has to be changed under the system parameter
With the above settings, all active control zones are heated by turning on the hot runner controller without exam-
ination of cycle signal to the set values. After reaching the setpoint values the Auto Standby function is automati-
cally activated.
After this all zones are controlled to the setpoint value set, when the cycle signal of the injection molding machine
fails within the adjusted time.
Should the actual setpoint be controlled again, the standby mode must be reset by the user via the operation and
display units. The controller heats the zones without exam of the cycle on the setpoint values and then turns on
the Auto Standby function again, when all active zones have reached the setpoint value.
Note: are there zones in the controller used only for temperature monitoring not for temperature control, their set-
point values should preferably be set to 0°C (equivalent to zone passive).
Description
The hot runner controller offers an Auto Standby function. Herewith the hot runner
controller monitors a cyclically recurring signal from the injection molding machine
and sets the controller, when the signal fails to appear within an adjustable time, into
standby mode. The setpoints are lowered depending on the configuration of the
standby function to a standby setpoint or by a standby temperature value.
Prerequisite for this function is a digital signal from the injection molding machine, as
well as the adaptation of certain configuration parameters in hot runner controller.
How it works
A digital signal (24VDC) of the injection molding machine must be fed to one of the
two available digital inputs. In the injection molding machine, the events must be de-
termined which lead to a change in signal level of the digital output. The hot runner
controller evaluates the signal edges. In injection molding machines are usually dig-
ital outputs available whose functions are freely configurable. For example, it lends
itself to use the cycle start as signal edge for the Auto Standby function and to reset
the signal during the injection cycle ("open tool" for example) by another event.
What good is it
To prevent damage to the plastic in the cavities of the hot runner by high tempera-
tures, for example, when production stops, the hot runner controller offers an Auto
Standby function.
Setting by
[SP11]Auto Standby Time (page 193)
[P007]Standby setpoint value (page 191)
For further details on parameters ([P***], [SP**], [CP**]) see Manual Parameters
hot-
control cDT+
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