EDI 222 Series Panduan Pengoperasian - Halaman 4
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1.3 GENERAL CHARACTERISTICS
Each channel of the Model 222 will tune automatically to any loop and lead-in inductance between 20
and 2000 microhenries and will provide satisfactory operation with lead-ins up to 1000 feet in length.
The unit will detect inductance changes as small as 0.01% ∆L/L. Each channel is sequentially
energized and sampled so as to negate the possibility of crosstalk between loops connected to
different channels of the same detector. Short and consistent sample periods result in fast response
times when operated in the lower sensitivity settings.
1.4 INSTALLATION AND ADJUSTMENTS
Setting up the Model 222 sensor unit:
a. Make sure that the unit is pushed fully home in its position in the input file.
b. Set the Sensitivity for each channel as required.
Sensitivity is set by moving the three DIP switches marked SENS to the desired position.
Position 7 is the highest sensitivity, 0 is the lowest.
c. Set the Operational Mode for each channel as required.
Operational mode can be set to presence or pulse mode. If presence mode is selected then
short or long presence may be set. Use short presence unless the loop is expected to be
continuously occupied for periods of time in excess of 30 minutes.
When the jumper labeled SEL3 is inserted, the Model 222 will limit the minimum presence
time to 100 milliseconds.
d. Set the Frequency for each channel as required.
Frequency setting needs to be changed only if interference occurs between adjacent loops
connected to different sensor units. Interference or crosstalk may manifest itself as
chattering of the call output or a detect call occurring at the same time as an adjacent unit
when there is no vehicle present. If crosstalk is suspected, try to separate the frequencies
of the channels causing the problem. For example, set one to LOW (3) and the other to
Eberle Design Inc.
Operations Manual
Sensitivity ∆L / L
Level 7
0.01%
Level 6
0.02%
Level 5
0.04%
Level 4
0.08%
Level 3
0.16%
Level 2
0.32%
Level 1
0.64%
Level 0
1.28%
Mode
MODE 1 MODE 2
Pulse
PL
Short
PR
Presence
Long
PR
Presence
Model 222
SENS 4
SENS 2
ON
ON
ON
ON
ON
OFF
ON
OFF
OFF
ON
OFF
ON
OFF
OFF
OFF
OFF
Duration
--
SH
30 minutes
LG
120 minutes
SENS 1
ON
ON
ON
OFF
ON
OFF
ON
OFF
Max
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