4
1.
DESCRIPTION
The BA577E-SS is a rugged general purpose, panel
mounting instrument with a single input that can be
configured as a Timer or as a Clock. As a Timer the
BA577E-SS is able to measure and display the
elapsed time between external events, or control
external events via two optional factory fitted control
outputs.
When configured as a Clock, the instrument can
display time in a variety of formats and the two
optional control outputs may be configured to switch
loads
on
and
off
at pre-set times.
This instruction manual is divided into sections.
Common features
2.
System design
3.
Installations
4.
Accessories
Timer
5.
Operation as a timer
6.
Configuration examples
7.
Maintenance
Clock
8.
Operation as a clock
9.
Configuration example
10.
Maintenance
This instruction manual supplements the abbreviated
instruction sheet supplied with each instrument.
2.
SYSTEM DESIGN
Fig 1 illustrates the basic circuit that is used for all
BA577E-SS Timer installations. Clock installations
are the same, except that the input terminals 5 & 6
are not used. For simplicity the optional control
outputs are described separately in section 2.4 of
this manual.
Fig 1 BA577E-SS connection
2.1
Power supply
The BA577E-SS requires a supply of 10 to 30V dc
between terminal 1 & 2 and consumes:
10mA
without optional backlight
plus
22mA
with optional backlight
plus
6mA
when terminals 3 & 4 are linked
2.2
Sensor input
As shown in Fig 1 the BA577E-SS Timer can be
controlled by a wide range of sensors which must
have a continuous not momentary output. The
BA577E-SS input is not used when the instrument is
configured as a Clock.
The following table shows the instrument's input
switching thresholds when configured to operate with
various sensors. For reliable operation the BA577E-
SS input must fall below the lower threshold and rise
above the upper threshold.
Sensor
Switching thresholds
Lower
Upper
Low voltage range
1.0V
3.0V
High voltage range
3.0V
10.0V
Proximity detector
1.2mA
2.1mA
Switch
100
1000
Open collector
2k
10k
Summary of Contents for BA577E-SS
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