BEKA BA577E-SS, Manual

Page: 8 / 38

8
4. ACCESSORIES
4.1 Display backlight
The BA577E-SS Timer or Clock can be supplied with
a factory fitted backlight that produces green
illumination enhancing display contrast and enabling
the display to be read at night or in poor lighting
conditions. The backlight is internally powered from
the instrument power supply so no additional wiring
is required, but the supply current increases as
shown below.
BA577E-SS Timer
current
consumption
Without backlight 10mA
Additional for backlight 22mA
Addition with terminals 3 & 4 linked 6mA
_____
Total current 38mA max
BA577E-SS Clock
current
consumption
Without backlight 10mA
Additional for backlight 22mA
_____
Total current 32mA max
4.2 Control outputs
Although the dual isolated control outputs are factory
fitted options, they are described in the main body of
this instruction manual as they will be used for the
majority of applications, see section 2.4. If control
outputs are required they should be specified when
the instrument is ordered.
4.3 Scale card
The BA577E-SS has a window on the right hand
side of the display through which a scale card
showing the units of time such as hours can be
seen. New instruments are fitted with a scale card
showing the units of measurement specified when
the instrument was ordered, if the units are not
specified a blank scale card will be fitted. A pack of
scale cards pre-printed with common units of
measurement is available as an accessory. These
can easily be fitted on-site without opening the
instrument enclosure or removing it from the panel.
See section 3.5 of this instruction manual.
Custom scale cards for applications requiring less
common units of measurement are also available.
4.4 Tag information
New instruments can be supplied with a tag number
or application information printed onto the rear panel
adjacent to the terminals. This information is not
visible from the front of the instrument after
installation.
4.5 Rear cover sealing kit
The BA577E-SS Timer or Clock’s rear of panel
ingress protection can be increased from IP20 to
IP66 with a BA495 rear cover sealing kit.
Manufactured from 316 stainless steel the cover
incorporates two M20 unthreaded entries for cable
glands. It allows the BA577E-SS Timer or Clock to
be installed in an open panel, or to provide additional
rear protection when installed within an enclosure.