Incite Fire FIREscape, Installation Manual

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FIREscape System Installation Manual
Page 57 of 56
19 Troubleshooting
19.1 RS-485 Data Connection
Serial Port communications are indicated via LEDs; red (data receive) and green (data send).
When the red LED is flashing, the unit is receiving data. This does not mean that the unit understands the
data. Not understanding the data may result from potential difference between the components.
When using separate power sources, these should be protectively isolated (not grounded). Cabling should
also be supplied so that the negative pin is connected between devices (in problem cases using several
conductors).
When the red LED is continuously on, it usually means that conductors A and B are reversed. Change the
polarity of conductors A and B.
The data connection can be checked with an LED without a limiting resistor. The LED is connected to the line
instead of the unit. Connect the LED between wires A and B; the LED should flash. Reverse the LED polarity;
connect it between wires A and B; the LED should flash. If the LED does not flash, check the cable for faults.
19.2 Ground Leakage
19.2.1 Interference with Keypad Data Line
Interference could suggest there may be earth leakage. The system must be grounded only at one point.
When a grounding point from an RS-232-connected device (such as a PC) is present, this must be located in
the same power phase as the control panel. In other cases, the RS-232 device(s) must be isolated from the
control panel with an isolator card. Measure the earth leakage by disconnecting the directly-connected RS232
device(s) from the system. After this, use a voltmeter in the DC range and measure each connection point
against building earth. The meter must show 0V.
19.3 Luminaire Line
19.3.1 Supply Current
The current can be determined with a voltmeter in the DC range in line + and
– of the luminaire mounting
base. The voltage must be between 40 V and 20 V depending on the load.
If the voltage is over 0 V but under 20 V, the line is overloaded. The overload can result from cabling error
(insufficient number of conductor pairs). The overload can also result from excessive normal-state light levels
of exit signs. The luminaires’ power consumption and, therefore the voltage loss, in the cable depends on the
luminaires’ light level/intensity.
If the voltage is 0 V, there is a break/short/overload that has blown the control panel’s line fuse. Measure the
cable for shorts. Check the line power units.
19.3.2 Line Data Communication
With the control panel programmed to communicate with only a specific address, for example, 127 (factory
setting for luminaire), attach a EL-DL2-AS, set to address 127 and with a battery connected, to the first
luminaire base in the wiring sequence.
By going through the system with a lit safety light you can determine if data communication works. Attach the
lit safety light to the base; the light should turn off in a couple seconds. The light should blink once