96VTR Datasheet, PDF (13/15 Pages) Extech Instruments Corporation. – 1/4 DIN Process Controller

setpoint changes always remaining a programmed number of units from the main
setpoint.
'02' Process High Alarm: Relay trips when the process (PV) exceeds the value
programmed at "A1SP" or "A2SP". Process alarms are fixed, absolute values and
do not change as the main control setpoint changes.
'03' Process Low Alarm: Relay trips when the process (PV) falls below the value
programmed at "A1SP" or "A2SP". Process alarms are fixed, absolute values and
do not change as the main control setpoint changes.
'04' Deviation High Alarm with Standby Sequence: Same as the Deviation High
Alarm but no relay action takes place until the process PV reaches the setpoint for
a second time. Standby sequence is also known as "Startup Inhibit" and is useful
for avoiding alarm trips during startup.
'05' Deviation Low Alarm with Standby Sequence: Same as the Deviation Low
Alarm but no relay action takes place until the process PV reaches the setpoint for
a second time. Standby sequence is also known as "Startup Inhibit" and is useful
for avoiding alarm trips during startup.
'06' Process High Alarm with Standby Sequence: Same as the Process High Alarm
but no relay action takes place until the process PV reaches the setpoint for a
second time. Standby sequence is also known as "Startup Inhibit" and is useful
for avoiding alarm trips during startup.
'07' Process Low Alarm with Standby Sequence: Same as the Process Low Alarm
but no relay action takes place until the process PV reaches the setpoint for a
second time. Standby sequence is also known as "Startup Inhibit" and is useful
for avoiding alarm trips during startup.
The following Alarm Timer Selections are available for Alarm 1 only
'08' EVENT ON-Timer: Upon power-up the alarm is de-energized. When the PV = SV
the alarm relay remains de-energized. When the timer counts down to zero, then
the relay energizes. Set the timer at parameter 'time' in Programming Level 1.
See Table IV below.
'09' EVENT OFF-Timer: Upon power-up the alarm relay energizes. When the PV =
SV the alarm relay remains energized. When the timer counts down to zero, then
the relay de-energizes. Set the timer at parameter 'time' in Programming Level 1.
See Table IV below.
'10' SOAK ON-Timer: Upon power-up the alarm relay is de-energized. When the PV =
SV the alarm relay energizes. When the timer counts down to zero the relay de-
energizes. Set the timer at parameter 'time' in Programming Level 1. See Table IV
below.
'11' SOAK OFF-Timer: Upon power-up the alarm relay energizes. When the PV = SV
the alarm relay de-energizes. When the timer counts down to zero the relay
energizes. Set the timer at parameter 'time' in Programming Level 1. See Table IV
below .
A1Fu
Setting
8
9
10
11
Table IV - EVENT and SOAK Timer Relay States
Controller When PV=SV
ALARM RELAY MODE at Power-up Timer Starts
EVENT ON-TIMER
OFF
OFF
EVENT OFF-TIMER
ON
ON
SOAK ON-TIMER
OFF
ON
SOAK OFF-TIMER
ON
OFF
ON = Alarm Relay energized OFF = Alarm Relay de-energized
After Timer
Counts Down
ON
OFF
OFF
ON
13
96VTR Ver. 2.0 11/99