74
ID-E270-011GB
The operation mode is switched after pressing the PERSONNEL ABSENT push button (the diode
located in this push button is lit). Changing the control panel operation mode is possible with at least
2
nd
access level.
The operation mode is automatically switched to PERSONNEL ABSENT when one of the four times for
automatic operation mode switching into the PERSONNEL ABSENT is programmed.
The operation mode is switched to PERSONNEL PRESENT after pressing the PERSONNEL ABSENT push
button again (the diode located in this push button is off). The programmed alarming variants are
restored to all zones.
8.2 FAULTS SIGNALLING
Thanks to its internal self-monitoring systems, the POLON 4900 control panel detects and signals
faults in detection lines and in the control panel.
Any detected fault is signalled optically and acoustically. Faults are signalled optically by steady light
of the yellow collective FAULT diode and acoustically by a slow intermittent signal of constant
frequency.
Clearing the optical and acoustic signals (FAULT) takes place automatically after the fault is removed.
The FAULT acoustic signalling is dis-actuated after pressing the backlit ACKNOWLEDGEMENT button.
Information regarding the detected faults is provided on the display. If, during 10 minutes from the
latest registered fault occurrence, there is no new fault, the LCD display is dis-actuated. If the display
is dis-actuated, the currently detected faults may be viewed after pressing the FAULT push button.
Then the display will present fault messages. If the number of messages exceeds the display
capability, they may be scrolled using the same push button or hi push bujons.
The exception from this rule are non-maskable faults in (properly programmed) monitoring circuits of
LK monitoring lines or the EKS-4001 monitoring and controlling elements whose messages are
automatically presented on the display until they are cleared.
If a printer is provided for operation, a message regarding a given fault will be printed on a paper
tape after it is detected.
8.2.1 Fault types
1. System faults:
-
program memory, RAM memory or CONFIGURATION fault;
-
microprocessor operation interference.
2. Microprocessor module faults:
-
microprocessor controller for the LCD display and operator's console fault;
-
the MSL-1M module microprocessor controller fault;
-
the MSL-2M module microprocessor controller fault;
-
loss of communication with the controller for the LCD display and operator's console;
-
loss of communication with the MSL-1M module controller;
-
loss of communication with the MSL-2M module controller;
-
non-declared MSL-1M or MSL-2M module if connected;
-
MSI-48 module microprocessor controller fault.
3. Detection line faults:
-
line processor fault;
-
line output short circuit;
-
loop output short circuit;
-
break in a detection line;
