baltur GI 350 ME, Instruction

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INSTRUCTIONS FOR REPLACING THE LAMTEC
SERVOMOTOR AND ITS ADJUSTMENT
Operation
The servomotor (air and gas) is controlled by the ETAMATIC
equipment according to an already set work curve. The travel
from minimum to maximum is limited by two adjustable cams
(2 and 3).
A potentiometer (8) is connected to the ETAMATIC equipment
and communicates the position of the servomotor to it
according to a value expressed in digits.
Servomotor replacement
To replace the servomotor, proceed as follows:
a) Disconnect the cables from the servomotor terminal block
and remove the servomotor from the fixing bracket.
b) Fix the new servomotor to the fixing bracket and reconnect
the cables as shown in the burner wiring diagram.
c) Operating on the screws of the cams (2 and 3) adjust the
servomotor travel so that the minimum and maximum
positions are reached (see indicators 1 and 12). To perform
this operation turn on the power to the burner, keep the
thermostat open, turn the switch (6) to “manual” and
operate the microswitches 4 and 5.
Potentiometer setting
When replacing the servomotor or just the potentiometer (8),
it must be set to the same digit values (min. and max.) of the
replaced potentiometer; these values are given on the original
servomotor adhesive dataplate (9). To set the potentiometer
(8), proceed as follows:
a) Connect the operating unit keypad with the cable supplied,
14 Play compensation spring
15 Feeding ring
enter the SETTING PASSWORD > to see the DIGIT values
of the potentiometers.
b) Connect the PC with the programming software to the
ETAMATIC equipment
c) Turn on the power to the burner and keep the thermostat
open.
d) Bring the servomotor to the minimum position by operating
the microswitch 5.
e) Remove the screws (7)
f) Move the ring (11), seeking the digit value
corresponding to minimum (see value on dataplate 9).
The value is displayed on the PC or “OPERATING UNIT” at
the channel in question.
g) After finding the required value, move the feeding ring
(15) to tighten the play compensation spring (14), fit the
potentiometer (8) in its seat and fix it with screws (7),
making sure the value found does not change. For minor
adjustments, loosen the screws (7) slightly and turn the
potentiometer (8) until finding the required value.
h) Using the microswitch (4), now bring the servomotor to
max. position, checking that the value in digits gradually
increases until reaching the maximum value given on the
dataplate (9); if this value is not reached it means that
servomotor travel is insufficient. To increase servomotor
travel see the section “Servomotor replacement” point
(c).