Unigas PN510 Manual Of Installation - Use - Maintenance Download

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General unit data

Mains voltage

AC 230 V +10 % / -15 %
AC 110 V +10 % / -15 %

Mains frequency

50...60 Hz ±6 %

External primary fuse

(Si) 5 A (slow)

Power consumption

12 VA

Mounting orientation

optional

Weight

approx. 200 g

Degree of protection

IP 40

Perm. cable lengths

max. 3 m at a line capacitance of 100 pF/
m

Detector cable laid separately

20 m

Remote reset

20m

Max perm. amperage at cos

ϕ≥

0.6
LMO14

LMO24-LMO44

Terminal 1

5 A

Terminals 3 and 8

3 A

5 A

Terminals 4, 5, 6 and 10

1 A

Flame supervision with QRB and QRC

QRB

QRC

Min. detector current required (with flame)

45 µA

70 µA

Min detector current permitted (without flame)

5.5 µA 5.5 µA

Max. possible with flame (tipically)

100 µA 100 µA

Measurement circuit for detector current

Key

µA DC

DC microamperometer with an internal

resistance of 5 k

max.

Blue

Black

Brown

SIEMENS LAL.. CONTROL BOX

Use

Control and supervision of oil atomization burners

For burners of medium to high capacity

For intermittent operation (at least one controlled shutdown every 24
hours)

Universally applicable for multistage or modulating burners

Housing and plug-in base

Made of impact-proof and heat-resistance black plastic

Lockout reset button with viewing window; located behind it:

Lockout warning lamp

Lockout indicator coupled to the spindle of the sequence switch and
visible in the transparent lockout reset button

uses easy-to-remember symbols to indicate the type of fault and the
point in time lockout occurred

Base and plug-in section of the LAL... are designed such that only burner
controls of the LAL... family can be plugged in.

24 connection terminals

Auxiliary terminals «31» and «32»

3 earth terminals terminating in a lug for earthing the burner

3 neutral conductor terminals prewired to terminal 2

14 knockout holes for cable entry by means of cable glands

8 at the side

6 in the bottom of the base

6 lateral threaded knockout holes for cable entry glands Pg11 or M20

Operation

Flame detector and flame simulation test are made automatically during
burner off times and the prepurge time «t1». If loss of flame occurs during
operation, the burner control will initiate lockout. If automatic repetition of
the startup sequence is required, the clearly marked wire link on the plug-
in section of the LAL... must be cut away.

Pre-conditions for burner startup

Burner control is not in the lockout position

Sequence switch is in its start position (with LAL2 voltage is present at
terminals 11 and 12.

Air damper is closed; end switch «z» for the CLOSED position must
feed power from terminal 11 to terminal8.

Contact of the limit thermostat or pressure switch «W» and the con-
tacts of any other switching devices in the control loop between termi-
nals 4 and 5 must be closed e.g. a control contact for the oil
preheater’s temperature

Normally closed contact of the air pressure switch must be closed.

Startup sequence

Start command by «R»:
«R» closes the start control loop between terminals 4 and 5

The sequence switch starts to run

Only prepurging, fan motor at terminal 6 receives power

Pre- and postpurging, fan motor or flue gas fan at terminal 7 receives
power on completion of «t7»

On completion of «t16», the control command for opening the air dam-
per is delivered via terminal 9

Terminal 8 receives no power during the positioning time

The sequence switch continues to run only after the air damper has
fully closed.

Prepurge time with air damper fully open:

The correct functioning of the flame supervision circuit is checked
during «t1»

The burner control will initiate lockout if correct functioning is not ensu-
red.

With LAL2:
Shortly after the beginning of «t1», the air pressure switch must change
over from terminal 13 to terminal 14 otherwise, the burner control will ini-
tiate lockout start of the air pressure check.
t3

Short preignition time:

«Z» must be connected to terminal 16, release of fuel via terminal 18.
t3’

Long preignition time: «Z» connected to terminal 15.

t3n

Postignition time:

- «Z» must be connected to terminal 15
- With short preignition, «Z» remains on until «TSA» has elapsed connec-
tion to terminal 16.
t4

Interval «BV1 – BV2» or «BV1 - LR»: On completion of «t4», vol-

tage is present at terminal 19. The voltage is required to power «BV2»
connected to auxiliary switch «v» in the actuator.
t5

Interval: On completion of «t5», terminal 20 receives power. At the

same time, control outputs 9 to 11 and input 8 are galvanically separated
from the LAL...’s control section.
LAL... is now protected against reverse voltages from the load control
circuit. With the release of «LR» at terminal 20, the startup sequence of
the LAL... ends. After a few idle steps (steps with no contact position
changes), the sequence switch switches itself off.
B

Operating position of the burner

B-C

Burner operation: during burner operation, «LR» drives the air

damper to the nominal load or low-fire position, depending on heat
demand; the release of the nominal load takes place via auxiliary switch
«v» in the actuator and in the event of loss of flame during operation, the
LAL... will initiate lockout. For automatic start repetition, the clearly
marked wire link «B» on the plugin section of the LAL... must be cut away.
C

Controlled shutdown: in the case of controlled shutdown, «BV...»

will immediately be closed. At the same time, the sequence switch is star-
ted to program «t6»
C-D Sequence switch travels to start position «A»
t6

Postpurge time: fan «M2» connected to terminal 7. Shortly after the

start of «t6», terminal 10 receives power and the air damper is driven to
the MIN position. Full closing of the air damper starts only shortly before
«t6» has elapsed initiated by the control signal at terminal 11. During the

LMO...

µA DC

QRB...

7130v01/0700

LMO...

µA DC

QRC1...

7130v02/0700