Operating instructions

INSTALLATION
01 Jan 14 3-13
DE-7200VFDCentrifuge
COMPRESSED AIR
Explosion-proof control cabinets require a source of clean, preferably instrument quality, filtered,
dry compressed air or nitrogen at 60 to 115 PSI at 20SCFM for operation of the control cabinet
purge system. The supply line must have a minimum diameter of 3/4” (20mm). The supply must
be clean, non-flammable, and from a non-hazardous area. The cleanliness requirements are as
follows:
Solid particles: 0.5µm <particle size 1µm, max. 1000 particles/m
3
Humidity: -40°C* pressure dewpoint
Oil content: 0.01mg/m
3
concentration total oil
* For applications where ambient temperature, T
amb
0°C, the air supply should be Class 2.1.1
with humidity -70°C pressure dewpoint
FEED PUMP
The customer is required to supply a positive-displacement feed pump for delivering slurry to the
centrifuge. A progressing cavity pump having a fixed ratio gearbox and 30 HP maximum inverter-
duty pump drive motor is recommended. The motor must be capable of operating in the 180 to
2700RPM, 6 to 90Hz speed range and also meet all other application requirements including
voltage, frequency, and area of classification. The pump size, motor, and gearbox ratio must be
chosen to deliver the maximum desired flow at a pump rotor speed (determined by the
manufacturer) to be low enough to prevent accelerated wear of the rotor and/or stator.
The pump must be connected to the centrifuge’s control system as described under Electric
Power Connections, so that its operation can be supervised by the centrifuge.
ELECTRIC POWER CONNECTIONS
DANGE
R! HIGH VOLTAGE! SHUT DOWN, LOCK OUT, AND TAG OUT
ELECTRIC POWER, AND ENSURE THAT EQUIPMENT HAS STOPPED
ROTATING BEFORE WORKING ON THIS EQUIPMENT.
IF THE INPUT
POWER IS SPLIT, BE SURE THAT PHASING IS CORRECT BEFORE
APPLYING POWER TO CENTRIFUGE.
Connection Options
A fused disconnect primary power supply is required for this equipment. The fused
disconnect and interconnecting wiring to the equipment must be suitably sized and in accordance
with National Electrical Code (NEC) standards and all other applicable state and local codes.
Additional wiring requirements are as follows:
1. The fused disconnect device shall have sufficient interrupting capacity to clear the maximum
fault current capability of the power supply system.
2. The GND connections in the control cabinet and sensor system junction box must be
connected to a known ground.
3. One of the lugs on the centrifuge base must be connected to earth/electrical ground.
Connect the facility’s three-phase electric power supply to the control cabinet in accordance with
the appropriate view in Figure 3-12. Non-hazardous area control cabinet connections are made
inside the control cabinet; hazardous area connections are made in the electrical panel attached
to the right side of the cabinet.