Q476
Frequency Input, Field Configurable
Isolator |
TECHNICAL SPECIFICATION (Q476)
|
| Input |
|
|
Frequency
Input |
|
Full Scale Range: |
|
2 Hz to 10,000Hz. |
|
Amplitude
Range: |
|
150mVp to
150Vrms |
|
Impedance: |
|
>10KW |
|
Overvoltage: |
|
180Vrms, max. |
|
Over-range: |
|
20KHz,
max. |
| Common Mode (Input to Ground): |
|
1800V, max. |
|
Zero Turn-Up: |
|
99% of full
scale range (9998Hz) |
|
Span Turn-Down: |
|
99% of full scale range
(2Hz) |
| Output |
|
|
Voltage
Output |
|
Output: |
|
0-5V, 0-10V |
|
Source Impedance: |
|
<100W |
|
Drive: |
|
10mA, max. (1KW, min. @ 10V) |
| Current
Output |
Output: |
|
0-1mA,
0-20mA, 4-20mA |
|
Source
Impedance: |
|
>100KW |
|
Compliance: |
|
0-1mA; 7.5V,
max. (7.5KW, max.) |
|
|
|
0-20mA; 12V, max. (600W, max.) |
|
|
|
4-20mA; 12V,
max. (600W, max.) |
| Accuracy |
|
+0.1% of selected range
at 25°C, including linearity, hysteresis |
| Stability |
|
|
+0.025%/°C maximum of selected range. |
| Excitation
Voltage |
|
8VDC, for open collector and
contact closure inputs 5mA short circuit current max. |
| Response Time (10 to 90%) |
|
500mSec., or
100 times the period of the full scale frequency. |
| CMRR |
DC: |
|
100dB |
|
>60Hz: |
|
80dB |
| Isolation |
|
|
1800VDC between input, output
and power. |
| ESD
Susceptibility |
|
Capable of
meeting IEC 801-2 level 3(8KV) |
| LED
Indication (green) |
|
|
|
LVL (green): |
|
lit when
power is on; |
|
|
|
Input < 107% then 8Hz
flash |
|
|
Input >
-7% then 4Hz flash |
|
IN
(yellow): |
|
input range programming
status |
|
OUT (red): |
|
output range
programming status |
| Humidity
(Non-Condensing) |
|
|
|
Operating: |
|
15 to 95% (@
45°C) |
|
Soak: |
|
90% for 24 hours (@
65°C) |
| Temperature Range |
|
|
|
Operating: |
|
0 to 55°C (5 to
131°F) |
|
Storage: |
|
-25 to
70°C (-13 to 158°F) |
| Power |
|
|
2.5W max., 100 to 240VAC +10%,
50 to 400Hz |
| Weight |
|
|
0.50
lbs |
| Wire
Terminations |
|
Screw terminals for 12-22
AWG |
| Agency Approvals |
|
CSA
certified per standard C22.2 (File No LR 42272). UL recognized per standard
UL508 (File No E99775). CE Mark pending. |
|
Diagnostic LEDs
The
Q476 utilizes three diagnostic LEDs. One is the dual fuction LED signal
monitor. This green LED indicates DC power and input signal status. Active line
power is indicated by an illuminated LED. If the input signal is 10% more than
full scale range, the LED will flash at 8Hz. Below 0% the flash is 4Hz.
The yellow IN LED, when on, denotes input programming modes.
The red OUT LED, when on, denotes output programming modes (see Configuration,
Calibration and Figure 1 for details).
Configuration
A major
advantage of the Q476 is its wide ranging capabilities and ease of
configuration. The Q476 enables virtually 99% zero and span adjustability. Any
2Hz range from 0 to 10,000Hz can be converted to a full scale output signal
(e.g. 0-2Hz/4-20mA or 9998- 10,000Hz/4-20mA).
Unless otherwise specified, the factory presets the Model
Q476 as follows:
| Input Range: |
0 to 1000Hz |
| Sensitivity: |
1V RMS |
| Output Range: |
4 to 20mA |
|
|
For other I/O ranges, refer to Table 1 for output range
(SW2, 1 through 8) switch settings and to Table 2 for sensitivity switch
setting (SW2, 9 & 10). For quick and easy calibration mode reference, see
the step-bystep flow chart in Figure 1.
- With power off, snap off the face plate by lifting the
right edge, away from the heatsink. Then, slide heatsink forward and off the
module. The output switch block (SW2) is located under the heat sink. Choose
the desired output voltage/current range from Table 1 and set positions 1-8 of
SW2.
- Set the input sensitivity switch (SW2, 9 & 10) to LO
for input amplitudes between 150mVp and 50Vrms, with noise rejection to 1Vp or,
to HI for input amplitudes between 500mVp and 150Vrms, with noise rejection up
to 10Vp.
Calibration
For best
results, calibration should be performed in the operating installation,
allowing at least one hour of thermal stability of the system. If
pre-calibration on a test bench is preferred then an output load equal to the
input impedance of the device(s) connected to the Q476 output is recommended,
along with a 1 hour warm up period. |
 |
|
 |
- Install the module on a piece of DIN rail and the I/QRail
mounting combination. See the I/ QRail data sheet for details.
- Connect the input to a calibrated frequency source and
the output to a voltage or current meter. Apply power and allow the system to
reach thermal equilibrium (approx 1hour).
- Adjust the input frequency to the desired maximum and
observe that the ouput has increased and is sensing the input. If this is not
observed, turn the sensitivity potentiometer in a counterclockwise direction
until the output changes proportionally to the input.
- With the green LED on press the CAL button for 5 sec. to
enter the calibration mode. The yellow and green LEDs should now be on.
- Input the maximum desired frequency (if not done already)
and press the CAL button to store. The yellow LED should now be the only LED
on.
- Input the minimum desired frequency and press the CAL
button to store. The green and red LEDs should now be on.
- To precisely adjust the maximum output, adjust the input
frequency until the output reads within +0.1% of the maximum selected output
range. This typically occurs near 90% of the HI input frequency. Press the CAL
button to store the value. The red LED will now be on.
- To precisely adjust the minimum output, lower the input
frequency until the output reads within +0.1% of the minimum selected output.
This typically occurs near 10% of the HI input frequency. Press the CAL button
to store the value. The yellow and Red LEDs should be on. The green LED should
be dim.
- Press the CAL button one final time to exit the
calibration mode. The green LED should now be on.
- Check the minimum and maximum inputto- output
calibration. Repeat steps 1 through 8 if calibration is not within desired
specifications.
|
|
Optimal Sensitivity
If
the amplitudes of the input frequency are within the sensitivity parameters
(i.e. 150mVp - 1Vp for LO and 0.5Vp - 10Vp for HI), then the sensitivity
parameters can be set for optimum noise rejection.
- Set the input near midrange (50% input) or to a frequency
that exhibits the minimum pulse amplitude.
- Turn the sensitivity pot (SENS) clockwise (CW) until the
output drops to minimum.
- Turn the sensitivity pot counter- clockwise (CCW) a turn
or two until the output returns to the previous level.
- Run the input through the full frequency range to make
sure that the pulses are sensed at both the low and high input frequencies. If
the output drops out during this test, when the input freq. >0% then turn
the sensitivity pot counterclockwise another turn or two until the output picks
up. Repeat to validate sensitivity settings.
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