SMT 2000REY, Руководство по обслуживанию, Страница: 6 / 20

6
Theory of Operation - Electrical
(cont.)
Remote station control circuits facilitate remote operation of
the pump and consists of up to ten remote stations (TB1 – TB10),
five conductor shielded cable and 5-pole Terminal Block (TB1). All
signals to and from the remote stations enter and exit the Master
Control Panel through terminal block (TB1). Signal lines to/from
the remote are:
Red wire – 24V AC power (out to remote station)
White wire – 24V AC return (out to remote station)
Black wire – 24V AC motor control signal (in from remote
station)
Green wire – 24V AC soap control signal (in from remote
station)
Brown wire – 24V AC sanitizer control signal (in from
remote station)
All remote stations are connected in parallel through the 5
conductor shielded cable. Each remote is spliced into the main
trunk of the control cable by color matching and connecting the
wires at each splice.
Refer to Figure 3, Remote Station Control Panel. When power
is initially applied to each remote station, the Remote Station
Control Panel will power-up in the “READY” state with the
indications and outputs as shown.
Touch pad Control Lead/ Output
Button Lamp Signal Wire Signal
ON off Motor control Black 0 volt
READY on n/a
OFF on n/a
SOAP off Soap control Green 0 volt
RINSE on n/a
SANITIZE off Sanitizer control Brown 0 volt
The remote stations will remain in the “READY” state until it is
operated with the touch-pad buttons on its control panel or
another remote is operated. When the “ON” button is pressed,
the “ON” lamp illuminates, the “READY” lamp and “OFF” lamp will
extinguish, and 24V AC will be present at the motor control signal
output (black wire). The motor control output must be active for
either the soap or sanitize controls to be active regardless of what
the soap or sanitize lamps may indicate.
Note: The motor control lead (black) is both an output and input
for the remote station. When any remote station is turned to “ON”
the 24V AC out from that remote station is applied to the motor
control circuit and to the Motor Control lead (black) of all other
remote stations. The 24V AC applied by the active remote station
to all other remote stations becomes an “inhibit” input signal. The
inhibit signal will force the remotes out of the “READY” state and
disable them.
The Motor control circuit is the signal control path from the
remote station to turn on the pump. When the ON button is
pressed on the remote station, the motor control signal (24V AC) is
sent through the 5-conductor control cable black wire to Terminal
Block (TB1) pin 4 in the Master Control Panel. From TB1-4, 24V
AC is sent to the coil of Motor Control Relay (K2). When K2 closes,
24VAC power is applied through its contacts to the coil of Motor
Contactor (K3) to turn on the pump motor (M1).
Chemical Control Circuits are driven by the remote station
circuit boards and control the flow of chemical in the system.
The chemical control circuits become functional only when the
pump is ON. While the pump is running, the operator may select
either Soap or Sanitizer using the Remote Station Control Panel.
The Soap circuitry and the Sanitize circuitry operation is identical.
When the operator selects Soap, the remote station Control Panel
will send 24V AC out the green lead through the 5-conductor
cable to Terminal Block (TB1) pin 3 of the Master Control Panel.
From TB1-3 the 24V AC is routed to the coil of Soap Solenoid
(SOL 1). SOL1 is connected in series with Chemical Inhibit Switch
(SW3) to the 24V AC return. If SW3 is closed, indicating that water
is flowing out to the spray gun, the Solenoid is activated and
chemical is injected into the flowing water. If the spray gun is
closed and the water is re-circulated to the float tank rather than
through the flow switch, the flow switch SW3 is open and the
chemical solenoids are disabled. Only one chemical control circuit
can be enabled at a time.
The Line Pressure Release Circuit controls the Line Pressure
Release Valve (SOL3) to automatically release pressure from the
system, upon turning the pump off. The line pressure release
circuit is driven by the normally closed output of Motor Control
Relay (K2). When the pump is turned “OFF” by the control panel,
Relay K2 is de-energized, sending 24V AC from the relay to solid
state 3-Second Timer (A1) pin 3. Upon receiving the 24V AC signal,
A1 energizes SOL3 for three seconds to open the solenoid and
release any pressure that may remain in the pressurized output
lines. SOL3 is de-energized and closes the Line Pressure Release
Valve at the end of three seconds, or immediately upon turning
the pump back “ON
Figure 3.
SMT Remote Station Panel