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Touchcal
Technology
Advances in microprocessor technology enable Action to
simplify setpoint calibration. Using a push-button instead of potentiometers,
improvements in calibration resolution are realized due to the elimination of
the potentiometer's mechanical variability.
For calibration, the user simply inputs the signal level of
the desired trip and presses the push-button to store it in non-volatile
memory. The deadband, or hysteresis, level is input next and is stored with
another press of the button.
Diagnostic LEDs
The
Q116 is equipped with three front panel LEDs. The first is a dual function LED
labeled IN (input). This green LED indicates line power and input signal
status. Active AC power is indicated by an illuminated LED. If this LED is off,
check AC power and wiring connections. If the input signal is 10% above or
below the configured input range the green LED will flash at 8Hz or 4Hz,
respectively.
Two red LEDs indicate the relay state for each setpoint. An
illuminated red LED indicates the tripped condition.
Output
The Q116 is
equipped with two SPDT (form C) relays, rated at 120VAC or 28VDC at 5 amperes.
Each of these relays is independently controlled by the field configurable
setpoint and deadband.
Operation
The field
configurable Q116 limit alarm setpoints can be configured for HI or LO,
failsafe or non-failsafe operation. Each of the setpoints has a respective HI
or LO deadband. In a tripped condition, the setpoint is exceeded and the
appropriate red LED will illuminate. The trip will reset only when the process
falls below the HI deadband or rises above the LO deadband (see Figure 1). For
proper deadband operation the HI setpoint must always be set above the LO
setpoint. In failsafe operation, the relay is energized when the process is
below the HI setpoint or above the LO setpoint (opposite for nonfailsafe). In
the failsafe mode, a power failure results in an alarm state output.
Dynamic Deadband
SI
circuitry in the Q116 prevents false trips by repeatedly sampling the input.
The input must remain beyond the setpoint for 100 milliseconds, uninterrupted,
to qualify as a valid trip condition. Likewise, the input must fall outside the
deadband and remain there for 100 milliseconds to return the alarm to an
untripped condition. This effectively results in a “dynamic deadband”
—based on time— in addition to the normal deadband.
Configuration
Unless
otherwise specified, the factory presets the Model Q116 as follows:
| Input: |
Platinum (100W) |
| Range: |
0 to 250°C |
| Output: |
Dual, SPDT |
| Trip: |
A:HI, B:LO |
| Failsafe: |
No |
| Deadband: |
A, B: 1.0% |
The AC power input accepts any AC source between 85 and
265VAC.
For other I/O ranges, refer to Tables 1 through 3 and
reconfigure switches SW1 and SW2 for the desired input type, range and
function.
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Input
- With the module removed from the rail and not powered,
snap off the face plate by lifting the right edge away from the heatsink. Slide
the heat sink off the module. Note the input switches (SW1 & SW2) are
located under the heat sink. Set positions 1 through 8 on "SW2" and position 8
on SW1 for RTD type (see Tables 1 & 4).
- Set position 1 through position 4 of input range switch
“SW1” for the desired RTD type and input temperature range (Table
3).
- Set position 5 and 6 of input range switch
“SW1” to ON (Closed) for a HI trip setpoint or OFF(Open) for a LO
trip setpoint (Figure 4 & Table 2).
- Set position 7 of input range switch “SW1” to
ON for non-failsafe operation or OFF (Open) for failsafe operation (e.g. alarm
trips upon power failure).
Calibration
- After configuring the DIP switches, connect the input to
a calibrated RTD source or a resistance decade box and apply power. (Refer to
terminal wiring in the Specifications section)
- Starting Calibration: After applying power to the unit
all three LEDs will flash for approximately 10 seconds. Next, adjust the input
signal level for Relay "A" setpoint, the green LED should be on. Press the CAL
button and hold for 4 seconds (until the red LED starts flashing) to enter the
calibration mode. The green LED should be on and the red Relay "A" LED should
now be flashing.
- Setpoint "A": Input the desired trip level for Relay "A",
if not already done, and push the CAL button. The green LED and the red Relay
"A" LED should be flashing. Note, The green LED will stop flashing when the
input drops below a high setpoint or rises above an low setpoint.
- Deadband "A": For minimum deadband (0.25% approx.), press
and hold the CAL button for 4 seconds. For high setpoints lower the input level
to the desired deadband point and push the CAL button. For low setpoints
increase the input level (green LED turns off) to the desired deadband level
and push the CAL button. The green LED should be on and the red Relay "B" LED
should be flashing.
- Setpoint "B": Input the desired trip level for Relay "B",
and push the CAL button. The green and the red Relay "B" LED should be
flashing. Note, the green LED will stop flashing when the input drops below a
high setpoint or rises above a low setpoint.
- Deadband "B": For minimum deadband (0.25% approx.), press
and hold the CAL button for 4 seconds. For high setpoints lower the input level
(green LED turns off) to the desired deadband point and push the CAL button.
For low setpoints increase the input level to the desired deadband level and
push the CAL button. The green LED should be on and both the red LEDs should be
flashing.
- Press the CAL button one final time to exit the
calibration mode. Check the setpoint and deadband to validate calibration.
Relay Protection And EMI
Suppression
When switching inductive loads, maximum relay life and
transient EMI suppression is achieved using external protection (see Figures 2
and 3). Place all protection devices directly across the load and minimize all
lead lengths. For AC inductive loads, place a properly-rated MOV across the
load in parallel with a series RC snubber. Use a 0.01 to 0.1mF pulse film
capacitor (foil polypropylene recommended) of sufficient voltage, and a 47W,
1/2W carbon resistor. For DC inductive loads, place a diode across the load
(PRV > DC supply, 1N4006 recommended) with (+) to cathode and (-) to anode
(the RC snubber is an optional enhancement).loads, place a properly-rated MOV
across the load in parallel with a series RC snubber. Use a 0.01 to 0.1mF pulse
film capacitor (foil polypropylene recommended) with (+) to cathode and (-) to
anode (the RC snubber is an optional enhancement).
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