Super Systems 9120 - Manual (Page 16)

4574 - SSi 9120 Manual Rev A Page 16 Super Systems Inc
Process High
Process Low
Band, Normally Open
Band, Normally Closed
Deviation, Normally Open
Deviation, Normally Closed
Deviation alarm is single sided. i.e. a +10 deviation will alarm when the PV is greater than SP + 10 but not neg. A -10
deviation will alarm when the PV is less than SP -10 but not on the positive side.
When set to deviation, the alarm message shows in Configurator below or above. The actual relay setup with that alarm
will only energize depending on the setpoint. For the standard alarms (1, 2, and 3), the user can select if the alarm
condition is for above or below. This will dictate when the relay will energize.
Example: alarm 1 set to plus 10F will alarm 11 degrees above setpoint and pull in the relay. It will show alarm 10 degrees
below but not pull in the relay.
A Band alarm will activate and energize the relay on both sides (+) and (-).
Note: some alarm types may be fixed at the current value .
Hysteresis
The hysteresis is in degrees, i.e. 10 hysteresis = 10 degrees.
Alarm hysteresis should not have a decimal place. It is in units. If it is a control loop doing on/off control then the decimal
place on the reset (hysteresis) should be ignored. The Hysteresis is a set number that works with the alarm to help
control a motor or pump longer to reach a set amount to come back into band before it will shut off motor or pump.
Example: Using quench oil as an example, assume the SP is 200F. The alarm is set as a deviation of +10F. At 210 the
alarm is active and the pump will run to cool the oil. With a hysteresis of 8 degrees the alarm and pump will turn off at
202F. It will turn back on when it is 10 degrees above setpoint. If the setpoint is still 200 then at 210 it is on again.
Clicking on this value will display an input box from which the user can select a new value. The range is from 0 to 9999.
Smart Alarm
This value is a display of the Smart Alarm status. A smart alarm is an alarm that works with a Process Variable and when
enabled it will not be active until the process variable is within band of the setpoint.
Example: If the SP is 1700 and the band is 10 degrees
the alarm will not be active until the PV reaches 1690.
The value can be either disabled or enabled.
ON Delay Time
This value is the ON Delay Time for the Smart Alarm, in
seconds. If the timer is utilized the alarm will not be
active until in band and the timer has timed out (this is in
seconds).
Example: If you select 30, the output will not energize
until 30 seconds after the alarm is active.
Clicking on this value will display an input box from which
the user can select a new value. The range is from 0 to
9999 seconds.
0 SP Blocks Alarm
This value will allow a 0 setpoint to block an alarm. The