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990-005500 Revision D
4
·
When the message ‘
bAd
’ is shown on the Contact Closure’s
corresponding 3-digit LED display, the associated relays go
into a ‘Yellow_Alarm’ to indicate that something is NOT
normal. Most likely the user has programmed for a Contact-
Closure sensor, while they are still using a 4-20 mA type
temperature sensor. (‘
bAd
’ means verify sensor type).
Contact Closure’s
Input
Current Range
Defined
State
Message on
3-digit
LED display
20.83mA or more
Closed-Circuit
(Valid)
SAF or ALr,
as per Var11 (Valid)
1.1mA to 20.8mA
Bad Sensor
(Invalid)
bAd
(Verify sensor type)
1mA or less
Open-Circuit
(Valid)
SAF or ALr,
as per Var11 (Valid)
·
Changes to the “
Var11
_Belt_Alignment_Sensor_Selection”
automatically clear any corresponding ‘orphaned’ alarms when
changing sensor pairs from Temperature sensors to Contact-
Closure sensors, and vice versa.
·
A Contact-Closure input can be turned ‘OFF’ completely by
setting the input’s BIAS setpt to ‘0999’. See discussion on
Var14
through
Var25
setpts below. (However note, the BIAS
feature itself is not applicable to Contact-Closure sensors).
IMPORTANT NOTE:
If an analog input is programmed for
use with a Contact-Closure type sensor, then an external
resistor
between 360
Ω
to 390
Ω
(1 watt minimum)
must be used
‘in-line’ with the corresponding Analog Input’s Signal terminal
(TBx pin2)
, as shown in the figure below.
The Electro-Sentry 1 is supplied with (8) eight 360
Ω
, 1 watt
resistors.
360
Ω
to 390
Ω
1 watt minimum
Contact Closure
Type Sensor
ES1’s
4-20mA
Input
1
TBx
2
3
The Warning and Shutdown SetPt Temperature
Variables (Var12 and Var13)
Var12.
Warning_Setpt_Temperature degrees (for all
temperature sensors).
If a Temperature Sensor exceeds this SetPt, then the ES1 gives an
alarm by the corresponding temperature display’s discrete
Yellow-LED / Yellow-Lightstack-Relay /
Temperature-Warning-Relay / Horn-Relay, and the 3-digit LED
display ‘Latches’ the highest value reached.
Var12
range is 0000 to 0250 degrees.
Factory default for Var12 is 0160 degrees.
Var13.
Shutdown_Setpt_Temperature degrees (for all
temperature sensors).
If a Temperature Sensor exceeds this SetPt, then the ES1 gives an
alarm by the corresponding temperature display’s discrete
Red-LED / Red-Lightstack-Relay /
Temperature-Shutdown-Relay / Horn-Relay, and the 3-digit LED
display ‘Latches’ the highest value reached.
Var13
range is 0000 to 0250 degrees.
Factory default for Var13 is 0175 degrees.
Notes: For Var12 and Var13:
To ‘clear’ the latched Yellow or
Red_Alarm the user must give a ‘Silence_Horn/Alarm_RESET’
command to the ES1 once the temperature has dropped below the
associated setpt. (See Operations Notes Section “How to Clear
Alarms” for details).
Содержание Electry-Sentry 1
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