Pulsafeeder PULSAmatic 7120, Installation, Operation, & Maintenance Instruction

Page: 7 / 34

4
1.4 Control Modes
Ratio Control- When ratio control is applied, the range of stroke adjustment is
proportionally reduced to a level equal to the ratio setting. For example, at a ratio setting
of 60%, the full span of the input signal commands the pump to operate between zero
and 60% of full stroke rather than over the full range of the stroke. The ratio is manually
set between zero and 100% using a remote potentiometer.
Split Ranging - A single control signal command s two pumps, each pump responding
only to a portion of the total range of the signal. The PULSAmatic controller operates
specifically as follows: One pump is commanded from zero to full stroke over the lower
half of the input signal, and a second pump is commanded, in the reverse-acting mode,
from full to zero stroke over the higher half of the input signal. For example, a 4-20 mA
input signal controls the first pump between zero stroke at 4mA to full stroke at 12 mA
and controls the second pump between full stroke at 12 mA and zero stroke at 20 mA
Manual- Remote manual stroke adjustment potentiometer.
Auto-Manual- Remote switch selection between automatic and remote manual
operation.
1.5 Current Output Signals
0-10 mA DC – 500 ohm Impedance max.
4-20 mA DC – 250 ohm Impedance max.
2. Equipment Inspection
1. Check all equipment for completeness against the order and for shipping damage.
Shortages or damage should be reported immediately to your PULSA Series
representative.
2. Check pump and PULSAmatic stroke control identification tags for serial and model
numbers. There are two tags: one on the pump gearbox which includes the pump
model number and another on the PULSAmatic enclosure. The pump gearbox serial
number identifies the PULSAmatic actuator as well as any separately mounted control
stations. Each should correspond to the information on the parts lists. Use these
reference numbers whenever corresponding with the factory.
3. Check the envelope containing this bulletin for service parts list and special drawings
and wiring diagrams for specified control options.
3. Procedural Notes
Electrical repairs and calibrations should be undertaken only by an electronic technician
q2ualified in the maintenance and repair of linear (analog) industrial process control
equipment.
A digital voltmeter and a process control signal generator are required for electronic
calibrations.
Troubleshooting and repair may require access to the mechanism linking the actuator
control to the oscillating housing inside the pump gearbox. This requires removal and