Hotset GmbH
141
Start-up-, Service- and Operation Manual hotcontrol cDT+
Rev. 1.00.05
Subject to technical changes
15.3 Heat'n'Dry
When molds are stored for a longer time, the insulating material for the electrical heating elements can draw mois-
ture. This moisture can at rapid heating (without Heat'n'Dry) lead to vapor pressure inside the heater and cause
damage. Furthermore this moisture leads to leakage currents on connected protective conductors, that discon-
nects fault-current circuit breakers and prevents the heating-up.
Heat ’n’ Dry executes a gentle heating-up with stepwise increasing of the power supply. The leakage current is
permanently checked. The moisture is completely dried by a setpoint value of 110°C.
The heating-up on the final setpoint value starts first, when it is assured, that
the error current lies below a adjustable limit value
in the heating elements is no longer moisture.
The function Heat’n’Dry is started, when the start conditions
Actual value < 90°C (194 °F)
Setpoint value > 110°C (230 °F)
Heat’n’Dry is enabled by parameter
are met.
During heating-up of the zones with active Heat’n’Dry function, also the inactive zones for Heat’n’Dry are adjusted
to 110°C. After the zones with active Heat’n’Dry are adjusted to 110°C, all zones are adjusted to their preset set-
point values.
While the Heat’n’Dry function is running, no current measuring is executed.
[SP05]Maximum residual current (page 193)) the maximum admissible value for the leak-
age current is set.
The function can be activated/deactivated by the parameter (
The function Heat'n'Dry has priority to function see function
Description
With Heat'n'Dry
hotcontrol cDT+
hot runner controllers offer a function for low-
stress heating-up of heaters.
How it works
During the heating-up process the hot runner is heated up with step-by-step heating
capacity. During heating-up process the residual current is checked. Exceeds the re-
sidual current the limit value set, the heating is done with reduced heating capacity,
as long as the residual current is under the limit value again. Heat‘n‘Dry has higher
priority than function start-up operation.
What good is it
Heat'n'Dry guarantees a longer lifetime of heating elements.
It is ensured, that a heating-up to the set setpoint value is only done, when it is 100%
guaranteed that there is no moisture in the isolation material of the heating elements.
By this, damage can be prevented resulting of short-circuits in the heater.
Setting by
[SP05]Maximum residual current (page 193)
For further details on parameters ([P***], [SP**], [CP**]) see Manual Parameters
hot-
control cDT+
.
Text in zone display see chapter
