4.6.4. OPTION: Gravure purge hardware
Note! The gravure unit purge function is a factory-configured option. This information is only
applicable to an
e
-Brick fitted with an EN954 safety interlock. The external (normally
closed) safety switch associated with the gravure station also controls an internal relay that,
in normal operation, keeps the
e
-Brick main contactor enabled at all times. However, when
the safety switch is actuated by insertion of the gravure unit this relay is disengaged and the
contactor will be switched off removing all power from the lamp.
4.6.4.1. I/O status table
The following table provides details of the I/O status of the e-brick under different operating
conditions i.e. gravure station used/not used and with UV lamps deselected/selected/running.
UV LAMP
STATUS
Gravure
unit
Contactor
n/c
contact
Contactor
n/o
contact
Individual
Ready n/o
contact
Purge / UV operation
e
-Brick off IN/OUT CLOSED OPEN OPEN No power, main
e
-Brick
contactor OFF
Off &
Deselected
OUT CLOSED OPEN OPEN
Off &
Deselected
IN CLOSED OPEN OPEN
Off & Selected IN CLOSED OPEN OPEN
Main
e
-Brick contactor OFF,
disabled by relay interlock.
Off & Selected OUT OPEN CLOSED CLOSED Main
e
-Brick contactor ON
UV START (1)
(Attempted)
IN CLOSED OPEN OPEN Main
e
-Brick contactor OFF,
disabled by relay interlock.
UV START (2)
(Cold start)
OUT OPEN CLOSED CLOSED Main
e
-Brick contactor ON
UV START (3)
(After gravure
use)
OUT CLOSED OPEN CLOSED i) Main
e
-Brick contactor
OFF
ii) 5 minutes purge cycle
(gravure station only)
PURGE
COMPLETE
(Lamp
selected)
OUT OPEN CLOSED CLOSED iii) Main
e
-Brick contactor
ON
iv) auto lamp start
LAMP ON OUT OPEN CLOSED CLOSED Normal UV operation
UV running
and
Gravure
inserted
IN CLOSED OPEN OPEN i) Main
e
-Brick contactor
OFF
ii) Lamp is turned off
iii) Normal cooling cycle for
lamp
WARNING! If the
e
-Brick is ‘selected’ the internal contactor is ON; even with the lamp OFF
there will be a potential of approximately 75V across the UV lamp. The
e
-Brick and lamp shall
only be considered electrically isolated if the lamp is ‘deselected’ i.e. the contactor is OFF.
4.6.4.2. External traffic light functionality
‘Individual Ready’ n/o contact status:
OPEN : traffic light GREEN
CLOSED : traffic light RED
GEW UV
e
-Brick installation and operating manual 29 of 49
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