Gestra Products Technical - Control And Power
Gestra Products Technical - Control And Power
Gestra Products Technical - Control And Power
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<strong>Control</strong>s<br />
Pump <strong>Control</strong>s<br />
Function<br />
The pump controls consist of the level sensor<br />
and the control cabinet with the associated<br />
accessories such as auxiliary relays,<br />
contactors, switches, control lamps etc . The<br />
control cabinets are tested and the wiring is<br />
effected via a terminal strip, ready for connection<br />
.<br />
146<br />
Design<br />
Pump controls are divided into two groups:<br />
systems with fixed digital switchpoints (NRSP<br />
1-1 .) where the switchpoints are determined<br />
by the length of the electrode tips, and systems<br />
with variable switchpoints that can be<br />
adjusted to the varying process conditions<br />
(NRSP 2-1) .<br />
Standard equipment Type NRSP 1-11 NRSP 1-12 NRSP 2-11 NRSP 2-22<br />
Run-dry alarm – –<br />
Run-dry and high-level alarms – – <br />
Time-dependent pump changeover – – <br />
Connection point for stand-by-pump – – – <br />
Collective malfunction message (visual) – –<br />
Collective malfunction message (visual & acoustic) – – <br />
Volt-free contacts <br />
Remote level indication – – – <br />
Programmable logic controller (PLC)<br />
Function<br />
The PLC are customised system solutions for<br />
individual control functions and used in pump<br />
controls, steam regenerators, desuperheating<br />
installations, injection coolers, steam driers<br />
etc . The control systems are based on the<br />
S7-300 module and feature a malfunction<br />
log and an Operator Panel that allows the<br />
user to visualise and parameterise controlled<br />
systems . A connection to higher ranking<br />
bus-based control systems or volt-free digital<br />
signals is available as optional extra .<br />
Design<br />
The PLC is based on the Simatic S7-300 and<br />
consists of a CPU (optional extra: Profibus DP<br />
interface) and digital and analog input and<br />
output components .<br />
To monitor and operate the equipment the<br />
Operator Panel is designed as line display<br />
or with full graphical display capability<br />
for installation in control cabinets . The<br />
conventional controllers can therefore be<br />
dispensed with and the variable switchpoints,<br />
e .g . for the NRSP 2-1, can be adjusted .<br />
The malfunction log lists and stores all<br />
malfunction messages, with time and date<br />
being added .
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