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The bypass is cleared whenever the system is powered up,
regardless of the fluid level. This means that if the system is
powered off prior to unloading and the fluid level is above the
horn alarm point, then the pump will not be allowed to run on
power up until the horn alarm is bypassed again. If unloading is
being done in a noise sensitive area, be aware that upon power
up the horn will sound since the bypass will be off. Be ready to
bypass the horn alarm as soon as possible after powering up.
During unloading of the tank, as the fluid level drops below the
alarm points the alarm indicators will go out, and the bypass will
be cleared (the system is re-armed) when the EMPTY/RE-ARM
indicator comes back on. This automatic feature means that there
is no need for the operator to re-arm the system, removing the
possible operator error of forgetting to re-arm. If the tank level
is below the horn alarm point, the bypass can also be cleared
manually by pressing the MANUAL RE-ARM button on the left
side of the controller. This is a dual purpose button, above the
horn alarm point it functions as the over-ride, and below the horn
alarm point it functions as the manual re-arm.
The 815UHP/H system has a number of convenience and safety
features built into it. When the tank level is below the horn alarm
point, the bypass will not work, preventing accidental bypassing
below the alarm point. There is a green PUMP ON indicator which
lights whenever the pump is allowed to run, so the operator
knows when a pump restart can be done. Delays are incorporated
into the system to prevent electrical noise or momentary bad
connections from disrupting operation. A short circuit in the
wiring to the gauge lights the red SHORT CIRCUIT indicator and
shuts down the pump. An open circuit in the wiring to the gauge
lights the red UNPLUGGED and VALVE ERROR indicators, sounds
the horn, and shuts down the pump. The horn sounding can be
bypassed but these shutdowns cannot be bypassed. The pulse
signal between the gauge and the controller cannot be corrupted
by poor connections or moisture in the wiring, if the signal is too
badly degraded it defaults directly to an open or short circuit
condition. A failure of the S
L
L or S
L
L Special gauge also
EE
EVE
EE
EVE
causes the controller to default to a shutdown condition. The
controller will operate at truck voltages from 8 to 16 volts, and
draws less than 1/8 amp so it can operate from any convenient 12
volt circuit. The controller is also fully weatherproof, so it can be
mounted at a convenient place on the trailer.
The grey horn configuration wire on the controller is not used for
the hydraulic pump application. The wire may not be present, and
if it is it can be left open or connected to ground.
Page 6
815UHP/H Manual
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