Operating instructions

Page 34
ProMinent
®
Features of the S2Ca metering pumps
The following functions are available as standard:
“Float switch” function:
Information on the liquid level in the feed chemical container is transmitted to the S2Ca. This
option requires the installation of a 2-stage float switch. This is connected to the “float switch”
terminal.
“Pause” function:
The S2Ca can be stopped by remote control via the “external control” terminal. The “pause”
function operates only via the “external control” terminal.
The following functions are activated by keystrokes:
“Stop” function:
The S2Ca can be stopped by pressing the STOP/START key without disconnecting from the
mains power supply.
“Prime” function:
Priming (short term feed at maximum frequency) is activated by pressing both arrow keys at
the same time (in “Stroke rate” permanent display).
Optional relay The S2Ca has two connection options (not in PROFIBUS
®
version).
Optional “fault-indicating relay” or “power relay”:
In the event of fault signals, warning signals or float switch activation signals, connects an
electrical circuit to trigger alarm sirens etc. The relay is retrofitted via an aperture in the power
end.
“Fault indicating and pacing relay” option:
In addition to the fault indicating relay the pacing relay can make a contact with every stroke.
The relay is retrofitted via an aperture in the power end.
Function and error
indicators The operating and error status is shown via the three LEDs and the “error” indicator on the
LCD (see also section 9):
LCD indicator If a fault occurs “error” will appear along with an additional fault warning.
LED indicator Operating indicator (green)
This indicator is lit as long as the S2Ca is operating correctly. It goes out briefly with every
stroke.
Warning indicator (yellow)
This warning light appears if the S2Ca electronics detect a situation that could lead to a fault,
e.g. “liquid levels low 1st stage”.
Error indicator (red)
This warning light appears if a fault occurs, e.g. “liquid levels low 2nd stage”.
Hierarchy of operating modes, functions and fault statuses
The different operating modes, functions and fault statuses each have a differing effect on
whether and how the S2Ca functions. These effects are given below:
1. Prime
2. Fault, stop, pause
3. Auxiliary frequency
4. Manual, analogue, contact, batch
i.e.
1. “Prime” can be activated in “Stroke rate” permanent display in any pump status
(as long as it is operable)
2. “Fault”, “stop” and “pause” stop all system parts up to “prime”.
3.
The stroke rate of the “auxiliary frequency” always overrides the stroke rates of the operating
modes listed in point 4.
BA_SI_036_06_10_EN.p65 08.06.2010, 11:38 Uhr34