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If a valve on the discharge side of the hydraulic pump is not open
when pumping is started, then the pump can generate enough
pressure to blow off the rubber hose between the pump discharge
and the closed valve. This can result in equipment damage, a
product spill, or operator injury. The 815UHP/H controller is able
to recognize a valve error in two ways, both of which result in an
immediate pump shutdown. A pressure switch sensing excessive
hose pressure or a micro-switch sensing valve position can be wired
to break the signal connection between the 808P2/810PS2 gauge
and the controller, in this case a valve error will cause both the
UNPLUGGED and VALVE ERROR indicators to turn on. Alternatively,
the switch can be wired to break the ground connection on the
hose protection wire on the controller, in this case a valve error
will cause only the VALVE ERROR indicator to turn on. If desired,
both techniques can be combined in the same installation, one for
loading and the other for unloading.
815UHP/H Manual
Page 7
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