4.4.6 Relay Output Contactor Drive
4.4.7 SSR Drive Output
Controllers fitted with the SSR drive output produce a time-proportional
non-isolated pulse voltage (0-20V nominal, output impedance 660 ohms).
The connections are shown in Figure 4.11
4.5 SENSOR PLACEMENT
Proper sensor placement can eliminate many problems in a control system.
The probe should be placed so that it can detect any temperature change
with minimal thermal lag. In a process that requires fairly constant heat
output, the probe should be placed close to the heater. In processes
where the heat demand is variable, the probe should be closer to the work
area. Some experimenting with probe location is often required to find this
optimum position.
In a liquid process, addition of a stirrer will help to eliminate thermal lag.
Since the thermocouple is basically a point measuring device, placing more
than one thermocouple in parallel will provide an average temperature
reading and produce better results in most air heated processes.
Proper sensor type is also a very important factor in obtaining precise
measurements. The sensor must have the correct temperature range to
meet the process requirements. In special processes the sensor might
have to have different requirements such as leak-proof, anti-vibration,
antiseptic, etc.
Standard sensor limits of error are ±4 degrees F (±2 degrees C) or 0.75%
of sensed temperature (half that for special) plus drift caused by improper
protection or an over-temperature occurance. This error is far greater
than controller error and cannot be corrected at the sensor except by
proper selection and replacement.
5. OPERATION
5.1 FRONT PANEL DESCRIPTION
OUT
FDC-2220
ALM
C
Control
Output
Indicator
Alarm
Output
Indicator
3 Silicon Rubber buttons
For ease of control set-up
and setpoint adjustment.
4-digit 0.4" red LED display indicating
process value or setpoint value.
3
5
4
6
or
120V /240V
Mains Supply
Alarm
Output
Control
Output
No Fuse
Breaker
Three
Phase
Heater
Power
Three Phase
Delta
Heater
Load
Fig. 4.10 Contactor drive Connections
Fig. 4.12 Linear Voltage / Current Connections
6
5
+
_
0 20mA,
4 20mA or
0 10V
~
~
~
4.4.8 Linear Output
There are three types of linear output modules (See Section 2) can be
selected for control output (OUT 1). The connections are shown in Figure
4.12.
6
5
Load
120V /240V
Mains Supply
+
+
_
_
SSR
Fig. 4.11 SSR Drive Connections
TOUCHKEYS
FUNCTION
DESCRIPTION
Up Key
Press and release quickly to select the desired digit of a numerical parameter
to change. Press and hold to increase the value of the selected digit for a
numerical parameter or to change the selection for an index parameter.
Down Key
Press and release quickly to select the desired digit of a numerical parameter
to change. Press and hold to decrease the value of the selected digit for a
numerical parameter or to change the selection for an index parameter.
(Direct) Scroll Key
Select the parameter in a direct sequence. Also used to select the tool
program parameters.
Long Scroll / Enter Key
Select the protected parameters in higher security level, also used to actuate
the execution for the selected tool program whenever the display is showing a
tool program.
Reverse Scroll / Calibration
Verification Key
Select the parameter in a reverse sequence during parameter scrolling, or
verify the display accuracy for various input types during the calibration mode.
Lock Key
Disable keypad operation to protect all the parameters from tampering.
Tool Program Key
Select the tool program in sequence.
Reset / Exit Key
Unlock keypad operation and reset the front panel display to a normal display
mode, also used to leave the tool program execution or ending the autotune
and manual control execution.
Autotune Key
Press and hold both keys for at least 3.2 seconds then release to start
execution of autotune program.
Engineering Key
By entering correct security code to allow execution of engineering programs.
This function is used only in the factory to speed up the production. The user
should never attempts to operate this function.
Press
for at least 3.2 seconds
Press
and
Press
and
Press
and
and
Press
and
Press
for at least 3.2 seconds
and
Press
for at least 3.2 seconds
5.2 KEYPAD OPERATION
* With power on, it has to wait for 12 seconds to memorize the new values of parameters once it been changed.
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