ACU-RITE DRO 200E - Manual (Page 31)

INSTALLATION
DRO 200E
27
Relay Timing Diagrams
The readout's
e
key lets the operator:
• turn all EDM functions “ON” and “OFF”.
• change the distance (R-DIST) that the retract relay is de-energized, or
• enter a Z-Top position. When a Z-Top position has been entered, the Retract
relay will energize at the preset retract depth, and will stay energized until the
ram reaches the Z-Top position. The relay will relax if the RAM stops before the
Z-Top position is reached.
Retract Without Dwell
Fig. 1
Spark
Dwell
Relay
Retract
Relay
Active
Relaxed
Active
Relaxed
Active
Relaxed
Retract begins
when cut depth
is reached.
Retract ends when
Z = R-DIST or Z-TOP
which ever occurs first.
Electrode is de-energized*
No dwell is programmed
Not Active
Spark
No Spark
Position
Hold Relay
There are three control function relay (CFI) outputs on the readout. When power
is on the Retract and Dwell outputs are energized. The Position Hold relay ener-
gizes when ram is at or below programmed cut depth.
The Retract and Dwell relays can be wired normally open or normally closed. The
Position Hold relay is always normally open.
In the event of a power failure to the readout all CFI outputs revert to a relaxed
state.
The following figures show the state of each relay while under the given conditions;
Retract Without Dwell, Retract After Dwell and Retract After Sparkout.
* The machine must be properly configured for the electrode to de-energize.