Fuji Electric PXZ Series Operation Manual page 15

SCALING THERMOCOUPLE AND RTD(Pt100) INPUT RANGES
Example: Program a J thermocouple for 50 to 500 ° F
Input Type Minimum/Maximum Range
32 . . . . . . . . . . . . .1472 °F
J Thermocouple
Program to 50
to 500
Full Range = (500-50) = 450 F
27.5 50
Setpoint Range
5%
Indicating Range
SCALING DC CURRENT/VOLTAGE INPUT RANGES
Example: Program a 4-20mA DC signal for 0 to 100 E.U.
Input Type Minimum/Maximum Range
4-20mA DC -1999 . . . 9999 Enginerring Units
Program to 0
to 100
Full Range = (100-0) = 100 Engineering Units
-5 0 100
Setpoint Range
5%
Indicating Range
P-AL Alarm Type 2:
P-AH Alarm Type 1: This function sets the control action for
the optional alarm output relays. The PXZ5, 7, and 9
comes with two relays while the PXZ4 comes with
one. They can be programmed for absolute, deviation,
combination, or zone alarm configuration. The high
and low alarm setpoints are set with primary menu
parameters AH and AL. The absolute alarm configura-
tions are independent of main setpoint. The alarm out-
put relays are energized when the process variable
exceeds the alarm setpoint, an absolute value. The
deviation alarm configuration is main setpoint track-
ing. The alarm output relays are energized when the
process variable exceeds the main setpoint by a devi-
ation value set by AL or AH. The combination alarm
configurations are a mixture of both the deviation and
absolute value settings for the high and low alarms.
With zone alarm configurations the alarm output is
energized between the range set by AL and AH.
One of the alarm types is Alarm with Hold. In this case
the alarm is not turned on the first time the measured
value is in the alarm band. Instead it turns on only
when the measured value goes out of the band and
enters it again. This type is useful when using devia-
tion alarm with step type input.
Enter the code for P-AH and P-AL from the Table of
Alarm Action Type Codes.
Note 1: A change of alarm action type can cause the
alarm set value to change, but this is not a malfunction.
Note 2: After the alarm type is changed, turn off the
power to the unit once.
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500 522.5
5%
105
5%
Table of Alarm Action Type Codes
ALM1 ALM2
Alarm type
( ) ( )
0 0
Absolute 1 1
value alarm
2 2
3 3
4 4
Deviation 5 5
alarm
6 6
7 7 High/Low alarm
8 8
9 9
High/Low alarm
10 10
High/Low deviation
Zone alarm 11 11
(ALM 1/2 independent action)
— 12
absolute alarm
— 13
deviation alarm
High absolute/
— 14
Low deviation alarm
High deviation/
— 15
Low absolute alarm
P-An Alarm Hysteresis: The Alarm Hysteresis is that area
on one side of the alarm setpoint where the output
does not change condition. That area or deadband is
intended to eliminate relay chatter at alarm setpoint
with less wear on the relay. With a wide Alarm
Hysteresis, the controller takes a longer time to
change output condition. With a narrow Alarm
Hysteresis, the controller takes a short time to change
output condition. Enter a value which is just large
enough to eliminate relay chatter.
Setting Range: 0 to 50% of full scale, set in E.U.
Alarm ON
Low Alarm
Setpoint
P-dP Decimal Point Position (Resolution): The Decimal
Point Position is the resolution at which the PXZ con-
troller displays the process variable and other para-
meter values. The PXZ can indicate integers, tenths or
hundredths of a unit. The Decimal Point Position does
not increase the accuracy of the controller, it only
increases the resolution. For a thermocouple, integers
are usually sufficient due to the accuracy rating and
the programmed input range. For a RTD (Pt100), inte-
gers or tenths of a degree may be entered, because of
the increased accuracy of these sensors, depending
on the programmed input range. For a 1-5/0-5V DC or
4-20/0-20mA DC signal, integers, tenths or hundredths
of a unit may be entered depending on the pro-
14
Action diagram
No alarm
High alarm
AH
AL
Low alarm
AH
AL
High alarm
(with hold)
AH
AL
Low alarm
(with hold)
AH
AL
AH
AL
High alarm
SV
AH
AL
Low alarm
SV
AH AH
AL AL
SV
AH
High alarm AL
(with hold) SV
AH
AL
Low alarm
(with hold) SV
AH AH
AL AL
(with hold)
SV
AH AH
AL AL
alarm
SV
High/Low
AL AH
AL AH
High/Low
SV
AL
SV AH
AH
AL SV
Alarm OFF Alarm OFF
High Alarm
Low Alarm Main
Hysteresis Setpoint Hysteresis
PV
PV
PV
PV
PV
PV
PV
PV
PV
PV
PV
PV
PV
PV
PV
PV
Alarm ON
High Alarm
Setpoint