RLE FMS V.1.13 - Manual (Page 48)

48 FMS User Guide 800.518.1519
3 Web Interface Configuration
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.
Hysteresis (also referred to as deadband) designates the amount
an input reading must sway from its preset alarm reading before it
is classified as returned to normal. It effectively provides a
deadband around the limit settings, which prevents sensors from
sending multiple alarm and return to normal alerts when the
sensor’s value hovers around its alarm limit.
Example: A temperature sensor alarms when it reaches its High
Limit 1 of 80°F. If Hysteresis is set at two, the sensor must register
less than 78°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.
UOM/Map Label 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 CRAC unit input is configured with an alarm delay of
10 seconds. If the CRAC unit goes into alarm and then returns to
normal within10 seconds, 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 but then alarms again within 10
seconds, the FMS does not record this as a return to normal. Once
the CRAC unit returns to normal for greater than 10 seconds, the
FMS records a return to normal and generates its notifications.
High Limit2 (Major) Applies only to analog 4-20mA inputs.
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 Limit1 (Minor) Applies only to analog 4-20mA inputs.
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.
Option Description
Table 3.3 FMS Main Board Configuration Options