1995-08-11_REVISION - M1977493 (12)

Home Browse Search

Page 2 If the level continues to raise, and both systems are operating, a "Peak Flow Alarm" will be activated at the control panel and at the mill control room the "Pump Station Alarm" will flash on. Before going to manual control and starting system No. 3 the backwash valve should be closed allowing an additional 200 gpm of water into the discharge lines. This will incrcese the flow into each. line to 1250 gpm for a total of 2500 gpm. 11 Equipment Operation Pump Automatic Control - Automatic operation of the pumping station involves the proper selection of the pump systems. Fig. 3A depicts the selector switch portion of the control board while Fig. 3B is an illustration of the three possible pump- ing combinations. (1) No. 1 system first, No. 2 system next (a) Place No. 1 system in auto position; (b) Place No. 2 system in auto position; (c) Place No. 3 system in off position; (2) No. 3 system first (replacing No. 1 system) $ No. 2 system next _ (a) Place No. l system switch in off position; (b) Place No. 2 system switch in auto position; (c) Place No. 3 system switch in No. 1 .position; (3) No. 1 system first, No. 3 system next (replacing No. 2 system) (a) Place No. 1 system switch in auto position, . ;.;..; (b) Place No. 2 system switch in_off,pos tion, (c) Place No. 3 system switch in No. 2 system. The first pump set in the selected system will start immediately on demand from the level control . The second pump set in the system will start 4 seconds later. When the level control calls for the pump system tc stop, both pump sets in the system stop together. In the event of an alarm condition shutting dowp a pump system, the "manual-off- auto" selector switch must be positioned at the off position and then back to the .auto position before the restart in the automatic mode can occur. Pump Manual Control - Manual operation of the pumping station consists of placing the "manual-off-auto" switch in the manual position and holding the "stop-start" switch in the start position only until the first set of pumps in the system start up. The second pump set of the system will start up automatically within 4 seconds. A pump system can not be restarted after an alarm condition shuts it down until the "manual-off-auto" selector switch is turned to the off position and then back to the manual position. Level Monitor - Levels in the reservoirs are. monitored by a capacitance type probe. The probe relays a signal to a programmable controller which starts and stops the pumps if they are in the automatic mode of operation. The control elevations in the reservoir are: