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