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l D e s c r i p t i o n
H o w t h e C o n a i r L D P Wo r k s
Electrical
The LDP pump is equipped with a fully wired, 3-phase magnetic starter, installed on the
pump assembly.
Idle Mode Valve
The LDP is supplied with a pneumatically controlled vacuum inlet air by-pass mechanism,
called an Idle Mode Valve that permits the LDP to continue running after material convey-
ing has concluded by switching the vacuum inlet of the LDP to filtered ambient air. The
idle mode valve allows the pump to run with no load for a period of time set at the convey-
ing system control to cool the pump and avoid unnecessary shut down/start-up when con-
veying cycles are frequent, but not continuous.
Vacuum Relief Valves
The LDP pump is equipped with two vacuum limiting devices that safely regulate the vacu-
um pressure of the pump to levels within the design parameters of the pump and for the
resin conveying application the LDP pump is designed to provide. Both are spring-biased
valves that are factory set for 20" of mercury. One vacuum relief valve is built into the
pump mechanism, adjacent to the vacuum inlet. The second valve is part of the idle mode
valve assembly, installed on the inlet to the primary filter. Any adjustment made to vacuum
levels (by Conair technicians only) is done to the vacuum relief valve on the idle mode
valve assembly.
Vacuum
Relief Valve
CAUTION: These settings should never be tampered with nor adjusted, or dangerous oper-
ating levels of the LDP pump could result, including a shortened operational life of the pump
and/or dangerously high vacuum levels throughout the vacuum network. Alternatively,
improper adjustment could result in poor pump performance, line clogging and lack of mate-
rial movement.
Non-return Valve
In order to avoid reverse rotation when the pump turns off, the LDP is equipped with a non-
return valve within the vacuum inlet.
( c o n t i n u e d )
Primary Filter
Vacuum Inlet
( C o n t i n u e d )
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