Watlow CLS200, Руководство пользователя

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CLS200 Series User’s Guide
Chapter 4: Setup
77
Table 4.8
—
Input Reading Offset
TYPE OF SENSOR
OFFSET RANGE
˚F ˚C
RTD2
J
K
T
-300 to +300 -300 to +300
RTD1 -300.0 to +300.0 -300.0 to +300.0
B
S
-300 to +76 -300 to +300
R -300 to +66 -300 to +300
Reversed T/C Detection
Set this parameter to ON to enable polarity checking for thermocouples. If a reversed thermocouple
is detected, the controller sets the loop to manual control at the
SENSOR FAIL HT OUTPUT or
SENSOR FAIL CL OUTPUT power level and displays the alarm.
ALARM
01 REVERSED T/C
DETECT ? OFF
Selectable values:
ON
or
OFF
.
Input Pulse Sample Time
You can connect a digital pulse signal of up to 2kHz to the pulse input. Use this parameter to set
the time over which pulses are counted. The controller counts pulses for the amount of time you set
here before calculating the frequncy. The controller scales this frequency and uses the resulting value
as the process variable for the pulse loop. Generally, the longer the pulse sample time, the more
stable the process variable, but the slower the response of the pulse loop.
This parameter is available only for loop 5 on a four-loop model, loop 9 on an eight-loop model or
loop 17 on a sixteen-loop model
ALARM
17 INPUT PULSE
SAMPLE TIME ? 1S
Selectable values:
1 to 20 seconds.
Linear Scaling Parameters
The following parameters are only available if the input type is LINEAR or PULSE . These parameters
let you scale the raw input readings (in millivolts or Hertz) to the engineering units of the process
variable.
For linear inputs, the input reading is in percent (0 to 100%) representing the 0 to 60mV input range
of the controller. For pulse inputs, the input reading is in Hertz (cycles per second.)