RLE Falcon EM - Manual (Page 39)

User Guide: Falcon FMS FMS Configuration
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Convert 50-95 ° F to 10-35 ° C and use the Celsius range for the calculations
Gain = (35-10) / 4 = 6 (round to the nearest integer)
Offset = 10 – 6 = 4
Example: Humidity sensor with a range of 0 – 100% RH
Gain = (100-0) / 4 = 25
Offset = 0 – 25 = -25
Hysteresis (Deadband): The number that designates the amount an input reading must sway from its
preset alarm reading before it is classified as returned to normal. The Hysteresis provides a dead band
around the limit settings to prevent several alarms and return to normal alarms when the input is the same
as a limit setting.
The Hysteresis applies when the input type is Analog 4-20mA and is active for High Limit 1, High Limit 2,
Low Limit 1 and Low Limit 2.
Example: A temperature sensor alarms when it reaches its High Limit 1 of 80°F. If Hysteresis is
set at four, the sensor must register less than 76°F before the FMS reports it as returned
to normal. In another example, a humidity sensor alarms when it reaches its Low Limit
2 of 30% RH. If the Hysteresis is set at five, the humidity must register more than 35%
before the FMS reports it as returned to normal.
Unit Of Measure (UOM): The 10 character field used to assign a unit of measure label to analog values,
such as °F, °C, % RH, Amps, Volts, PSI, etc. The unit of measure field is only required when the input type
is Analog 4-20mA. The unit of measure field is displayed on the Main Menu and in notification
(email/pager messages and SNMP Trap).
Alarm Delay: The amount of time the FMS waits to send an alert after an alarm condition is detected.
The FMS uses this same time delay to report a return to normal after the alarm condition clears. The alarm
delay is active for all input types except Not Configured.
Example: An input is configured as a digital NO, labeled “CRAC UNIT ALARM” and has an
alarm delay of 10 seconds. When the CRAC unit alarms, it closes the contact to the FMS.
If the CRAC unit returns to normal and opens the contact to the FMS within the 10
second alarm delay, no alarm is generated in the FMS. If the CRAC unit remains in alarm
for 10 seconds or more, the FMS records the alarm and generates notification per the
input settings. If the CRAC unit returns to normal and alarms within the 10 second alarm
delay, the FMS does not record it as a return to normal. Once the CRAC unit returns to
normal for the 10 second alarm delay, the FMS records a return to normal and generators
notification per the FMS settings.
High Limit 2: Applies only when the input type is Analog 4-20mA. The FMS will record an alarm and
send notification when the FMS calculated value exceeds this limit. The High Limit 1 and High Limit 2 are
disabled when they are both set to 0. High Limit 2 will also activate any designated relays.
High Limit 1: Applies only when the input type is set for Analog 4-20mA. The FMS will record an alarm
and send notification when the FMS calculated value exceeds this limit. The High Limit 1 and High Limit 2
are disabled when they are both set to 0.
Low Limit 1: Applies only when the input type is Analog 4-20mA. The FMS will record an alarm and
send notification when the FMS calculated value falls below this limit. The Low Limit 1 and Low Limit 2
are disabled when they are both set to 0.
Low Limit 2: Applies only when the input type is Analog 4-20mA. The FMS will record an alarm and
send notification when the FMS calculated value falls below this limit. The Low Limit 1 and Low Limit 2
are disabled when they are both set to 0. Low Limit 2 will also activate any designated relays.