Rockwell Automation 7000L PowerFlex Medium Voltage AC Drive (C Frame) - Classic Control User Manual
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Component Definition and Maintenance
7000L-UM300I-EN-P – June 2013
7000 “C” Frame
Pump Replacement
While the drive is running, one of the pumps must be in operation.
Two pumps run alternatively. The switching from one pump to
another pump depends upon the Control Program setup. If the drive
is running and you need to replace one pump, it is important to select
the pump in operation by changing the pump selector switch position
from auto to the pump number which is in operation.
Perform the following steps to replace the pump ON LINE.
1. Select the running pump by changing the pump selector switch.
2. Open the overload relay of the pump to be replaced by pressing
the RED button of the overload relay.
3. Check voltages at terminal T1, T2 and T3 of the pump contactor
(PC) make sure that there is no voltage.
4. Disconnect wire T1, T2 and T3 at pump.
5. Close Valve V4 and V11 if pump # 1 is to be replaced OR V5
and V12 if pump # 2 is to be replaced.
6. Loosen only bottom and front true union connector of the two
valves (Valves V4 and V11 are for Pump #1 and Valves V5 and
V12 are for Pump #2).
7. Unbolt the pump from its foot-plate.
8. Take the pump out and replace it with another.
9. MAKE SURE THAT CORRECT VOLTAGE IS TAPPED
FROM THE NEW PUMP WINDING. ENSURE THE THREE-
PHASE SUPPLY IS TERMINATED IN THE ORIGINAL
SEQUENCE TO KEEP THE SAME PUMP ROTATION
DIRECTION.
Piping, Tubing and Connectors
The piping is schedule 80-type made from chlorinated polyvinyl
chloride (CPVC) which has good high and low temperature
properties; it is unaffected by de-ionized water or ethylene glycol.
The main piping is either 1.5 inch (38 mm) or 2.0 inch (50 mm)
diameter.
The flexible tubing for the coolant path from the manifolds to the
various hose barbs throughout the drive is 3/8 inch (10 mm) inside
diameter silicon. The manifolds, just as the chill blocks, use hose
barbs to provide easy connectivity of the hoses.
Pump Maintenance and
Replacement (cont.)