Lorentz PS2-150 Series Manual For Installation And Operation page 74

72 Troubleshooting
12 Troubleshooting
Please read this section carefully in case you experience any
problems with the pump system and follow the checklists.
Should technical support by LORENTZ become necessary,
always provide the model and serial numbers.
12.1 Pump does not run
Most problems are caused by either wrong cable connec-
tions (in a new installation) or failed connections, especially
insufficiently tightened cables that come loose from a ter-
minal. Please check the wiring. The System status light will
indicate that the system is switched on and a power source
is connected to the controller. It indicates that voltage
is present but in a solar-direct system there may not be suffi-
cient power to start the pump. In this case it will attempt a
restart every 120 seconds.
12.2 Pump attempts a Restart every 120 Seconds
The controller will emit a low noise as it tries to start the
pump. The pump will start to turn or only vibrate a little.
(1) There may be insufficient power reaching the controller.
A solar-direct (non-battery) system should start if there
is sufficient sun to cast a slight shadow. A battery
system should start if the supply voltage is higher than
what is listed in "Set points for low voltage disconnect"
on page 29.
(2) If the pump was recently connected (or reconnected)
to the controller, it may be running in reverse direction
due to a wiring error.
(3) If the motor shaft only vibrates but does not turn, it
may have power on only two of the three motor wires.
This will happen if there is a broken connection or if
you accidentally interchanged one of the power wires
with the ground wire.
(4) The pump or pipe may be blocked by mud, clay, sand
or debris
CAUTION – if the pump is blocked, it has
to be cleaned. Repeated starting of a
blocked pump may cause damage to the
motor. This will void the warranty.
12.3 Flow Rate is to low
Check if the pipeline dimensions are correct as pressure
losses will reduce the flow. Ensure that there is no leakage
in the pipeline.