Lorentz PS200 Instructions For Installation Operation Service page 40

Operating the Pump continued
Starting the pump Be sure there is not a
closed valve or other obstruction in the water
line. Switch on the array disconnect switch in
the junction box, and toggle the power switch
on the controller. It is normal to leave the
switches on at all times, unless you desire to
have the system off.
A solar-direct pump should start under the
following conditions
1. clear sunshine at an angle of about 20°
or more from the surface of the solar
array
2. cloudy conditions, if the sunshine is
bright enough to cast some shadow
3. low-water probe submersed in the water
source (or bypassed in the controller) –
Water-Low light OFF
4. full-tank float switch is not responding to a
full tank – Tank-Full light OFF
5. battery system only – voltage is higher
than the low-voltage disconnect point (22V
or 44V)
When sunshine is insufficient When
sunshine on the array is present, but too weak
for the pump to run, it will attempt to start
about every 90 seconds. During each attempt,
you will see the PUMP ON light come on.
When pump runs slowly (PUMP ON) under
weak sun conditions
1. PS-Pump models that have "C" in the
model number -– These use a centrifugal
pump end. In weak sun, the pump may
spin without lifting water all the way to the
outlet. This is normal.
2. PS-Pump models that do NOT have "C" in
the model number – These use a helical
rotor (positive displacement) pump end. If
the pump is turning, even slowly, water will
be delivered at a slow rate.
When pump stops from a sudden shadow on
the solar array
If a shadow suddenly passes over the array,
like if you walk in front if it, the controller will
lose track of the input voltage. It may make
rapid on/off noises and a high-pitched noise,
then stop. This does NOT indicate a problem.
The pump will attempt to restart after the
normal delay.
40
Time delays
1. After pump stops due to insufficient
sunshine – 120 SECONDS
2. After full-tank float switch resets – 2 to 3
SECONDS
3. After low-water probe regains contact with
water in the source -– 20 MINUTES but
the indicator light will slowly falsh for the
rest of the solar day, or until power is
disrupted or the controller is turned off/on.
4. Battery systems – after low voltage
disconnect point is reached, delay to stop
pump – a few SECONDS. After voltage
recovers, delay to re-connect – a few
SECONDS
To force a quick start To test or observe the
system, you can bypass the normal time
delays. Switch the POWER switch off then on
again. The pump should start immediately if
sufficient power is present.
Pump vibration Most PS-Pump models use
a HELICAL ROTOR pump end (those that do
NOT have a "C" in the model number. A slight
vibration is normal with these pumps. If noise
is disturbing, try changing the position of the
pump. PS-Pump models that have a "C" in
the model number use a CENTRIFUGAL
pump end similar to conventional pumps.
They should produce no significant vibration.
PUMP OVERLOAD (PUMP ON light shows
red instead of green) The system has shut
off due to an overload. This can happen if the
motor or pump is blocked or very difficult to
turn and is drawing excessive current (hard
to turn). Overload detection requires at least
250 Watt output of the solar array. This can
be caused by a high concentration of solids
in the pump, high water temperature, exces-
sive pressure due to high lift or a restriction
in the pipe, or a combination of these factors.
The controller will make 3 start attempts
before shutting down the system. The
System ON LED will be OFF and the red
OVERLOAD LED ON. The system will not
reset until the ON / OFF switch is turned OFF
and ON again. See Troubleshooting, Section
9.3 "HIGHER CURRENT".