PROBLEM?
Before you call the manufacturer of the system, check and compare the observed effects with the one described below
6.5 TABLE of special
unit states after
the power has been switched off:
EFFECT
WHY
What to do
after the power has been switched off
- the lit green “POWER” LED, no
messages on the LCD display or
messages are illegible and delayed
display or ambient temperature
below
0
°
C
wait for about 15 minutes until
compensation of temperatures or to
provide higher temperature of the
ambient air
after burn-in alarm states “
A1
” or “
A2
”
are generated at detectors’ inputs,
which last for a few dozen seconds,
then “
H1
” or “
H2
” alarms decay
with a long-term storage of DEX or
low ambient temperature, the burn-
in period was longer than the
expected 1 minute (for detectors of
low levels of calibration)
switch the unit off, enter the
installer’s menu, extend the burn-in
time
(max. 20 minutes), exit the menu;
after burn-in the detectors are in
normal state, while after submitted to
test gas erroneous alarms are
generated
too long “A” and “A16” connecting
conduits;
Reduce the length of “A” and “A16”
connections;
“
Pr
” emergency state at input to the
detector
damaged supply conductor
in the “A” or “A16” conduit or
shorting between conductors or
improper polarization of supply
change polarization of conductors,
remove shorting between
conductors or exchange in conduit
„A” or „A16”;
switch the unit of for 10 seconds
and switch it on again
“
S
” emergency state at input to the
detector
broken signal conductor
in “A” or “A16” conduit
or
incorrect order of signalling
conductors
remove opening of conduits, correct
order of conductors in conduit “A” or
“A16” or exchange conduits;
reset the unit with the “OK” button
emergency state “
FVAC
”,
“Power supply”
diode pulsates
(only in version B)
no external 230V AC supply
voltage,
main switch turned off or main fuse
damaged (next to the main switch)
the unit supplied from internal
battery - turn the power on and
reset the unit with “OK” button
or change the fuse (for identical
one, time delay cut-out), perform
the change with power off
emergency state “
FVAC
”,
the
Power supply
diode is constantly
lit (only in version B)
information on a break of external
supply longer than 60 seconds
reset the unit with the “OK” button.
Emergency state “
FVDC
”
- in version A denotes the drop of
external supply voltage below
10.5V or damage of external supply
unit or connection cable “E”
- repair the external supply unit or
exchange the connection cable “E”
in alarm states signallers connected to
“U=12V ALARM OUTPUTS
” do not
work
- shorting in the connecting conduit
or a damaged signalling device -
automatic reset fuses triggered;
- service mode on
- switch the unit power off;
remove shorting in the conduit or fix
the signalling device, switch the
power on
- switch the service mode off
“
InA1
” or „
InA2
” emergency state
voltage connected to
12V alarm
inputs
on A2 and/or A1 terminal(s)
(cascade connection)
ALARM signal from external
devices (parent detectors in normal
state). Alarm inputs operate with 5-
second delay.
valve(s) is/are not closing despite the
fact that A2 state is generated and
mechanical efficiency of the valve is
checked
too high resistance of connecting
conduit with “M” valve(s) (too small
section of conductors for a given
length)
change the conduit for a thicker one
or install the second one (4 x 2.5
2
),
connecting conductors in pairs
parallel
lack of possibility to establish
transmission with the unit in Modbus
RTU protocol
incorrect configuration of
communication parameters,
incorrect unit address, damaged
RS232-RS485 converter
enter system settings menu, turn
Modbus RTU Slave/Master on, set
the proper slave address, check
transmission parameters
all lights and LCD display off
- no power or the main switch is off - switch the power on
MDP-4(8,16)… Instruction Manual
edition 6PU63en
©gazex’2011 v1101
Page 21
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