Fault Diagnostics
21
Building Technologies
FL-III Maintenance and Repair
CPS Fire Safety
08.2012
4 Fault
Diagnostics
4.1 Hardware
Based on the fault indication, the possible causes and their corrective actions can
be worked through successively. If the respective item is correct and the fault
indication is still present, then continue with the next item.
4.1.1
The controller does not show a response, no LED is lit
Observations:
When the controller is switched on: the LED “Power” on the front panel of the
device and the LED “Power On” on the rear panel of the device is not lit.
No LED’s light up for approx. 3 seconds on the front panel of the device when
the controller is switched off and subsequently switched on and no signal tone is
audible. The LED “Power On” on the rear panel of the device is not lit.
The green LED “Power On” of the power supply on the rear panel of the device
indicates whether all required internal voltages are present for the supply of the
circuit boards.
The LED’s on the front panel of the device are controlled by the digital module.
The LED’s briefly light up for approx. 3 seconds when switching on the device and
indicate the current state of the device only after approximately 20 seconds.
Possible causes and solving the problem:
The power supply cable is not connected
Connect the power supply cable and if it is a DC power supply, additionally secure
the connector with the knurled screws.
The external power source does not have the correct voltage / current /
power output for the controller
Provide a suitable power source and if necessary, check it with a multi-meter:
–
Power supply, 12V to 48V DC: 12 to 48 V= nominal; 3.5 to 1.1 A (45 W max.)
–
Power supply, 100V to 240V AC: 100 to 240 V ~ nominal; 50 to 60 Hz nominal;
0.6 to 0.25 A (85 VA max.)
The voltage must be checked with and without load (controller) connected.
The power supply cable is faulty
Check the power supply cable with a multi-meter or continuity tester. If necessary,
replace the cable.
The power supply cable 12 to 48V DC was connected incorrectly
Check the connection assignment and connect it correctly:
Pin assignment:
–
A1:
+24V DC
brown lead
–
A2:
Earth
green-yellow lead
–
A3:
0V DC
blue lead
