Why is the current unstable when two circulation pumps are in operation?
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The current is stable when one unit is running, but it fluctuates when two units are running simultaneously.
It might be caused by resonance resulting from an excessively small pipe diameter leading to high air velocity, or by resistance in the equipment’s pipes; we experience this phenomenon here as well
It is estimated that when two pumps are in operation, the flow rate becomes too high; the liquid supply at the pump inlets is not sufficient, resulting in a brief vacuum condition at those inlets. However, this situation lasts only for a short time before the supply is restored, but it soon becomes insufficient again. As a result, the flow rate of the two pumps fluctuates, leading to unstable and varying currents.
The motor power is proportional to the pump’s flow rate and outlet pressure. That is, with a constant voltage, the motor current is proportional to the pump’s flow rate and outlet pressure. According to Bernoulli’s equation, changes in flow rate are closely related to changes in pressure. Higher flow rate results in lower pressure, and vice versa. It is recommended that LZ monitor the fluctuations in the pump outlet pressure; the pattern of these fluctuations should correspond to that of the current curve. I think it is the flow rate fluctuations of the pump that cause the current fluctuations. Reason: 1. The common inlet manifold for the pumps is too narrow; moreover, when the fluid is distributed to the two pumps, the flow velocity increases and becomes unstable, resulting in fluctuations in flow rate that in turn cause fluctuations in current. 2. Does the fluid source for the pump come from a confined space? 3. The pipeline losses are relatively high. Countermeasures: 1. Is there a return line at the pump outlet? If so, adjust the pump outlet valve and the return line valve to maintain a stable pump outlet pressure as much as possible. 2. Run only one pump.
The process pipeline design is unreasonable; this is caused by the time pulses and resonance phenomena that occur when two machines are in operation
Taking into account the analyses of the above individuals, we have a fairly clear picture. Another possibility is that different pressure levels of the two machines lead to unstable gas flow rates; in such cases, it is generally the case that the machine with the lower pressure level will have a higher current. In such situations, we generally try to avoid using system shortcuts to regulate the flow rate; instead, we use a circulation pump to do so. Although this leads to an increase in the inlet temperature of the circulation pump, it does help to reduce current fluctuations.
When two circulators are operated simultaneously, the suction conditions at the inlet differ, resulting in changes in load and fluctuations in motor power
Two circulators operate simultaneously, performing reciprocating movements; the inlet exhibits unstable operating conditions, which results in varying air delivery volumes for each compressor as well as power fluctuations
Try reducing the circulation volume of the circulator and use a bypass line for adjustment! ! !
Besides what was mentioned above, sometimes it’s a circuit issue; you can have an electrician take a look
It should be considered a problem with air flow distribution; try adjusting the amount of air distributed.