Alarm Setup

The 9210 Nitrider can be configured to use three different alarms and a Thermocouple Check Alarm. Each of the alarms consists of an alarm setpoint, alarm type, alarm hysteresis, smart alarm, and ON delay time. The alarms come from the factory with a default configuration dependent on the application but also can be modified prior to shipment to your facility or in the field by a supervisor.

 

Setpoint

This value is the setpoint for the alarm.  Clicking on this value will display an input box from which the user can select a new value.  The range is from –9999.00 to 9999.00.

 

Alarm Type

This value is the type of alarms used.  Clicking on this value will display an input box with two (2) drop-down lists from which the user can select a new value. 

The values in the first (top) list box are:

 

PV 1 Value

    PV 2 Value

    PV 3 Value

    Input 1 Value

    Input 2 Value

    Input 3 Value

    PO1 Value

    PO2 Value

    PO3 Value

 

The values in the second (bottom) list box are:

 

    Process High

    Process Low

    Out of Band

    In Band

    Outside Deviation

    Within Deviation

 

The process high alarm condition is when the PV is above the alarm setpoint; and process low means the alarm condition is when the PV is below the alarm setpoint.

 

Example: The 1400 deg contact is used to indicate when it is safe to add gas.  Therefore you would want to set it as proc low with relay being normally closed (when no alarm). Then when it reaches a PV below 1400 deg. The alarm comes on and then the relay becomes an open. So if power were to fail this would not keep the relay energized.

 

Hysteresis

This value is the Hysteresis value.  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, suppose the SP is 200 ◦F.  The alarm is set as a deviation of +10 ◦F.   At 210 ◦F, the alarm is active and the pump will run to cool the oil.  With a hysteresis of 8 ◦F, the alarm and pump will turn off at 202 ◦F.   It will turn back on when it is 10 ◦F above setpoint.  If the setpoint is still 200 ◦F, then at 210 ◦F, it will turn 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 (PV), and, when enabled, it will not be active until the PV is within band of the setpoint. The alarm sounding - if active - will be disabled until within the SP band. When it is in band, the alarm will go active unless on delay time is set.

 

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 timer.  If the timer is utilized, the alarm will not be active until the PV goes in band and activates the Smart alarm and then out of 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.

 

Thermocouple Check

Source 1 – Source 3

 

This will set the source for the T/C Check.  The list of options are:

Not Used        Instrument 11        Instrument 22

Instrument 1        Instrument 12         Instrument 23

Instrument 2        Instrument 13        Instrument 24

Instrument 3        Instrument 14        Instrument 25

Instrument 4        Instrument 15        Instrument 26

Instrument 5        Instrument 16        Instrument 27

Instrument 6        Instrument 17        N/A

Instrument 7        Instrument 18        Input 3

Instrument 8        Instrument 19        Input 2

Instrument 9        Instrument 20        Input 1

Instrument 10    Instrument 21

 

Tolerance Band

This option will set the tolerance band for the T/C Check.  The range is -9999 to 9999.

 

Source 2 Offset

This option will set the offset used with Source 2.  The range is -9999 to 9999.

 

Source 3 Offset

This option will set the offset used with Source 3.  The range is -9999 to 9999.

 

 

Default Configuration

Parameter	Value
Alarm 1 Setpoint	1.00
Alarm 1 Type	PV1 Process High
Alarm 1 Hysteresis	1
Alarm 1 Smart Alarm	Disabled
Alarm 1 ON Delay Time	0
Alarm 2 Setpoint	1400
Alarm 2 Type	PV2 Process High
Alarm 2 Hysteresis	10
Alarm 2 Smart Alarm	Disabled
Alarm 2 ON Delay Time	0
Alarm 3 Setpoint	1400
Alarm 3 Type	PV2 Process High
Alarm 3 Hysteresis	1
Alarm 3 Smart Alarm	Disabled
Alarm 3 ON Delay Time	0
T/C Check Source 1	Not Used
T/C Check Source 2	Not Used
T/C Check Source 3	Not Used
T/C Check Tolerance Band	0
T/C Check Source 2 Offset	0
T/C Check Source 3 Offset	0

 

Standard Setup for DA Alarm with Delays

DA is usually set up as PV 1 (Loop 1)

8.00 = 8% D.A.

Parameter	Value
Setpoint	8.00
Alarm Type	PV1 Band NO (Out of Band)
Hysteresis	1
Smart Alarm	Disabled
ON Delay Time (sec)	3600