SITEC Srl Elettronica Industriale
Delay command for second relay (DIP 6)
Operation description (24V AC/DC model)
The Sitec timer is provided with a 24 V AC/DC power supply input, a count start input and a count
memory input. As to outputs, the timer is provided with two 16A power relays.
The timer counts down starting from the time set by the operator by means of the front ring.
The count is made to start by the count start control.
At count end and with the appropriate settings of the internal dip-switch, the Sitec timer allows :
(a) contemporary switching of relays K1 and K2
(b) switching of relay K1 and after a delay time of relay K2
(c) switchings as in a) or b) above, count reset and reset of switching contacts
The count memory control stops the count (and the value reached is saved) if the count start control is
cut off.
The count is made to start again from the saved value by the count start control.
A typical electric diagram of the timer for kneading machines (on page 6 of 6) is described here below.
Two timers are generally used: one with 10-scale and one with 20-scale.
The first timer (timer 1) makes the pan of the kneading machine rotate at the first speed for the time
set.
The second timer (timer 2) makes the pan rotate at the second speed for the time set.
The electromechanical diagram allows an automatic, semiautomatic or manual operation of the
equipment.
The electromechanical diagram consists of :
- the emergency push button SB1 which sets the machine in emergency state.
- The stop push button SB2 to stop the machine.
- The selector switch SA2(X) with two fixed positions, a NO. contact and a N.C. contact, allows the
machine operation forward/backward when SA2(1) is closed and SA2(2) is open, or only backward
with SA2(1) open and SA2(2) closed.
- The selector switch SA1(X) with three fixed positions and two N.C. contacts allows the following
operations:
automatic : SA1(1) closed and SA1(2) closed
semiautomatic : SA1(1) open and SA1(2) closed
manual: SA1(1) open and SA1(2) open
- The pan jog push button SB5 allows the manual movement of the pan, forward or backward
according to the position of the selector switch SA2(X)
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