Dungs MPA 5111, Руководство пользователя

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7 Description of the behaviour
7.1 Unlocking function
If the MPS is locked (state 0), it can
be unlocked by pressing the unlock
key. In order to distinguish the func-
tion from potential EMC interfering
impulses, the key must be kept de-
pressed for at least 1/4 second.
The same applies for the 230 V un-
locking.
According to DIN EN 14459 (annexe
J), the number of possible unlock-
ings are limited to 5 in 15 minutes,
that means the automatic system
denies further unlockings if the MPA
has been unlocked more than 5 times
within a short time period. Only after a
waiting time during which the MPA is
provided with power, it is possible to
unlock the MPA again.
The waiting time is 15 minutes or 3
minutes for each unlocking
Extended unlocking
The described limitation to 5 unlock-
ings in 15 minutes can be reset using
the "Extended unlocking". To do this,
the unlock key must be pressed for at
least 5 s (max.. 10 s) (after 5 s, the dis-
play begins to flash).
The "Extended unlocking" is active
in all operational states of the MPA,
that means that a safety cut-off with
restart of the MPA in operation can be
carried out via the "Extended unlock-
ing" also in the presence of a flame.
230 V unlocking input!
7.2 Access level
Write access to MPA is defined on dif-
ferent access levels.
Each parameter is assigned to a cer-
tain access level. In order to modify
a parameter, MPA must be at the as-
signed or higher level.
If the access level is not sufficient to
modify a parameter, the VisionBox
reports it, or a message is output on
the MPA display prompting the user
to enter the valid password. At higher
levels, the users must press a key to
confirm that they are "on site". For this
purpose the display is flashing for 30 s
if a key is pressed; otherwise, the MPA
remains at the previous level.
To change the access level, the cor-
rect password must be entered in the
"VisionBox → Settings MPA → Access
level". The access level is automati-
cally reset after 5 hours or after power
failure. Exception: If the automatic gas
burner performs a restart during these
5 hours, for example due to an error,
these 5 hours for the current access
level are counted again from the be-
ginning.
NOTE: After completing configuration
of the automatic gas burner it is rec-
ommended to reset the access level
immediately manually (display) by
means of the shortcut - and ←, setting
"E1" (see chapter Display unit).
7.3 Parameter change
Parameter types:
1-bit parameter (U1) - setting 0 and 1
(displayed as ON/OFF), no limits
8-bit parameter (U8) - value setting
within variable limits
16-bit parameter (U16) - value setting
within variable limits.
A parameter can be modified on the
display (see Appendix BMA_display)
of MPA or via the VisionBox software
on a PC.
In order to change a parameter, the
access level assigned to the param-
eter must be set, see chapter Access
level.
The value must be within the variable
limits; a value outside these limits is not
possible or it is rejected by the MPA.
Experts can change the variable up-
per and lower limits, usually it requires
a higher access level than the level
assigned to the parameter value. The
variable limits may only be changed by
means of VisionBox, not on the MPA
display. The variable limits are restrict-
ed by means of fixed limits. The vari-
able limits cannot be changed outside
of these limits. These fixed limits can-
not be changed.
There are parameters which cannot be
changed during normal operation, see
Appendix Parameter table. To change
these parameters it is necessary to
switch to the state "Waiting for heat re-
quest".
The parameter stick (extension mod-
ule) monitors selected parameters dur-
ing start-up (see 8.11)
7.4 Special operating modes
7.4.1 Operation without valve check
system
If the valve check during start-up (P40)
and the valve check after a regular
switch-off (P41) are inactive, a simul-
taneously activated double gas valve
can also be used instead of two indi-
vidual gas valves. This double valve
must be activated using the valve
output V2 of the MPA since V1 opens
before the safety time for the start-up
has elapsed!
Note: Even if P46 is "active", the input
GDWVPS is still monitored!
7.4.2 Operation with valve check
system
If the valve check is active during start-
up (P40), it will be carried out during
each start-up. The time required for
the valve check is not included in the
Adjustable pre-aeration time (P60
and P61) and, therefore, it can be re-
duced.
If the valve check after a regular
switch-off (P41) is active, it will be car-
ried out after every regular switch-off.
Additionally, a valve check during
start-up is carried out if the valve check
after the last regular switch-off has not
been successful, if the automatic sys-
tem has been switched off by a safety
shutdown or if a power failure has oc-
curred since the last switch-off.
If the valve tightness test has been
completed successfully and P41 is in-
active, the tightness test and the state
"Pre-aeration B" are skipped during
the next start-up (see section "Opera-
tion with reduced pre-aeration time").
Level Designa-
tion
Key con-
firmation
required
1 Dungs yes
2 OEM Ex-
pert
yes
3 OEM yes
4 Service yes
5 Operator no