Specifications

IP 240 Position Decoding
Functional description
All data required for operation must be entered in a data block (DB 10 in the example). The data
include:
• the speed at which the furnace moves over the various zones of the workpiece,
• the cut-off points of the zones (limit values),
• the identifiers for the various zones,
• the traversing speeds for a new starting point (zero point) and
• the traversing speeds for automatic return of the induction coil to the starting point.
1. Preparatory measures for heat treatment
When the workpiece has been placed in the furnace and the data entered in DB 10, the
induction coil must be moved to its starting point. Momentary-contact pushbuttons ”FOR-
WARD” and ”BACK” are used to move the coil to its starting position. The equipment is ready
once the ”ON INPUT” pushbutton has been pressed to acknowledge. This state is indicated by
the ”ENABLED” indicator.
2. Heat Treatment
Heat treatment is started by pressing the ”START” button. The ”RUNNING” indicator stays on
as long as heat treatment is in progress. At the final/turning point, the heater is switched off
and the induction coil returns to its starting position. The ”Heating” indicator shows the state
of the heater. The process can be repeated when the ”ENABLED” indicator goes on.
3. Aborting heat treatment
The heater is switched off and the induction coil stopped when you press ”EMERGENCY
STOP” or limit switch ”LMTSW FORW” or ”LMTSW BACK”. The ”STOPPED” indicator shows
which option was used to halt the process, as shown in the following table:
Pushbutton ”EMERGENCY STOP” indicator
EMERGENCY STOPshows steady light
LMTSW FORW flashes
LMTSW BACK flashes
Following an abort, heat treatment cannot be resumed until the induction coil has returned
to its home position. To move the coil, proceed as directed in Step 1.
4. Faults
An error on the IP 240 sets the ”FAULT” indicator. Flag byte 10 contains a code indicating the
cause of the error.
The following steps are carried out automatically in the event of a fault:
• the heater is switched off
• the induction coil is stopped
• flag byte 11 is transferred to flag byte 10
• flag byte 11 is reset
EWA 4NEB 811 6120-02a 7-31