Brooks Instrument SLA5800 Series - Manual (Page 43)

3-11
Brooks ® Digital MFC's & MFM's
Section 3 Operation Installation and Operation Manual
X-TMF-SLA5800-MFC-eng
Part Number: 541B027AAG
April, 2013
3-6-3 General Alarms and Warnings (Analog versions only)
Several alarms are available to indicate unexpected process control events
as follows:
Flow Alarms
Two flow alarms will be provided. Each will allow the user to set a minimum
and maximum flow limit range. Whenever flow is not within the range, the
alarm will occur. These two general flow alarms provide more flexibility
than having specific low and high flow alarms. These two alarms may be
used to create separate low and high flow alarms, or maybe used to
provide banding around a flowrate. If the device is a controller, then this
alarm is disabled if the setpoint is not within the specified flow limits or if
the valve override is active.
User Power Supply Alarm
The User Power Supply Alarm monitors the Power Input to the device for
values outside the device specification of 13.5 to 27 Vdc. The user can
configure the voltage limits that activate this alarm in order to monitor their
supply voltage for a tighter specification than the device requires.
Setpoint Deviation Alarm
The Setpoint Deviation Alarm monitors the difference between Setpoint
and Flow and sets the alarm when the difference exceeds the specified
limits for more than the specified delay period. The user specifies a
minimum and maximum limit in percent of Setpoint. This alarm is disabled
if the valve override is active.
No Flow Indication Alarm
The No Flow Indication Alarm will occur when the measurement of flow
indicates flow less than a value that can be configured to 0 - 2%. If the
device is a controller, setpoint must exceed the configured limit and valve
override must not be active for this alarm to occur.
Totalizer Overflow Alarm
The Totalizer Overflow Alarm will occur when the Flow Totalizer reaches its
maximum value and resets to zero. This alarm is permanently configured
as a latching type alarm which requires the user to reset the alarm via the
Service Port or the RS-485 interface.
Flow Analog Output Loop Open Alarm
The Flow Analog Output Loop Open Alarm will occur when the device
detects that there is no current flowing on the current loop. This alarm
could be the fault of an open connection on the analog output current loop.
Setpoint Analog Input Out of Range Alarm
The Setpoint Analog Input Out of Range Alarm will occur when the Voltage
Input exceeds the maximum allowable 5.5 V, when the 4 – 20 mA input is
less than 3.8 mA or greater than 22 mA, or when the 0 – 20 mA input is
greater than 22 mA.