CAME SMA Mode D'emploi page 8

Dip Switch #1
Dual Loop Configuration A
(non-directional mode)
(directional A— B mode)
LED • 1 Green LED shows when the module is powered
• 2 Red LEDs give
SIGNAL
• the corresponding loop detection state in normal situation
• the value of the oscillation frequency measurement or an error message on power ON
In normal situation the red LED stays ON as long as the loop detects any metallic object.
On power ON the sensor measures the oscillation frequency of each loop. The result of this measurement is displayed using
the corresponding red LED. The amount of blinking indicates the tens value of the frequency. For example 4 short flashes
correspond to a frequency between 40 kHz and 49 kHz. After this message the LED goes back to normal display.
If the loop oscillation frequency falls outside the limits set between 20 kHz and 130 kHz the red LED displays an error
message and the sensor activates the corresponding relay. The blinking frequency shows the type of error according to the
next table. The sensor will stay in this state until the problem is cleared and the frequency goes to the right range.
Remark : The sensor launches automatically a learning process if the oscillation frequency changes more than 10% in
comparison with the measurement value.
Loop frequency error
Oscillation frequency too LOW or loop open
Oscillation frequency too HIGH
Loop shorted or no oscillation
TROUBLE- SYMPTOM
SHOOTINGS
The loop detector will not work
The green LED is off
The loop detector will not work
The red LED is flashing slowly
(0.5 Hz)
The loop detector will not work
The red LED blinks at either 1Hz or
2Hz
The loop LED is detecting properly but
the contact is not made
Dip switches 5 to 8 are not responding
properly
Frequency adjustment for loop A for single loop detector
OFF
ON
OFF
ON
Loop A
Loop A
Loop B
Relay A
Pulse on entry B Pulse on exit B
Relay B
Pulse on entry A Pulse on exit A
Pulse on entry B Pulse on exit B
Relay B
Pulse on entry A Pulse on exit A
PROBABLE CAUSE
There is no power supply to the loop
detector
The corresponding loop is shorted
The frequency of oscillation falls
outside the allowed range
Bad connection of the relay contacts
Their function varies according to
dip switch #10 setting
Dip Switch #2
OFF
OFF
ON
ON
Dual Loop Configuration B
Loop B
Loop A
Loop B
Relay A
Relay B
(non-directional mode)
Relay B
(directional A— B mode)
LED display
LED blinking at 1Hz
LED blinking faster at 2 Hz
LED blinking slower at 0.5 Hz
Loop frequency
High
Mid High [High –20%]
Mid Low [High – 25%]
Low [High – 30%]
Loop A Loop B
Pulse on entry B Pulse on exit B
Pulse on entry A Pulse on exit A
Pulse on entry B Pulse on exit B
Pulse on entry A Pulse on exit A
CORRECT ACTION
Check power supply
Check the loop cable
Adjust frequency with dip switches
or change loop turns
Check relay connections
Check the appropriate loop mode
required and adjust dip switch #10