Electrex Rexcon Die Sentry Manuel - Page 6

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Sentry. The unused output should not be connected to anything.

USING THE DIE SENTRY

The following sections provide all of the information about the

actual operation of the Rexcon Die Sentry. The Theory of Operation

behind die protection is discussed, in addition to the OPERATION

of the Die Sentry.

DIE PROTECTION

A Die Sentry uses five probes to implement Die protection. The

probe can be used independently in one of four modes - TIMED

MODE, CAM MODE, NORMALLY OPEN, and NORMALLY

CLOSED. Unused probes can be TURNED off. In addition, there is

an optionally available program which checks to make sure that

limit switches change states on every press cycle.

The Normally Open and the Normally Closed modes are

straightforward in their operation. If a NORMALLY OPEN probe is

closed, it will cause a fault. Normally Open probes are use in

Buckle Detection. Likewise, if a Normally Closed mode is intended

as an OUT of STOCK Detection but can be used anywhere a

Normally Closed probe is needed.

TIMED and CAM modes are more complex in their operation and

are the main subject of this section. Both TIMED and CAM modes

have a set "Window" in which the probe must be seen as "ON." The

simpler of the two Modes of OPERATION is the CAM (or Limit

Switch) Mode. In this mode, when a probe's limit switch goes "ON",

an examine period begins. The examine period ends when the limit

switch goes back "OFF." The probe must be seen as "ON" before

the examine period ends. If the probe goes ON during the examine

period, the Die Sentry reports the time from the start of the examine

period until the probe goes "ON" as the probe time. If the probe is

already "ON" when the examine period begins, a probe time of

0.000 will be reported. Probe faults are generated while the device

is in SETUP MODE but the FAULT OUTPUT is always LEFT ON

(doesn't stop the press).

Here is a typical probe Timing Diagram using the CAM Mode.