Refill with hydraulic oil (Exxon (Esso) Univis N46 or Shell Tellus T37) if necessary. If hyd.
oil level has been very low, then bleeding may be necessary, refer to Chapter 11.3
FWD/HWD Hydraulics, and the paragraph āBleeding the Hydraulicsā.
17.2 Switching off all Power
The trailer power is switched on either by the Power Switch of the Compact15 Front Panel or
remotely (if the Network Cable is connected) by the SYSTEM ON push-button on the
Remote Control Box.
So, to switch off ALL power, disconnect the network cable and switch OFF the Compact15.
17.3 Checking Trailer Electronics Power
On switching on the Compact15, at least the P1 LED must turn on. If not, check the 2A and
the 16A fuses (of the Compact15 Front Panel) and exchange if necessary (slow blow type). If
P1 LED did not turn on, but one or more of the others did, then power is OK, but the P1
circuit may be defective (will be checked in a later step).
17.4 Checking Trailer Battery Condition
The battery voltage, monitored directly on the battery terminals, should be at least 12.0 Volts
unloaded (i.e., hyd. motor not running).
Turn MAN.KEY and press LC button for 3 to 5 seconds and check that the hyd. motor runs
properly and that the battery voltage does not decrease below 10.5 Volts.
If the voltage decreased too much, or if the motor relay and motor toggles on and off, then the
trailer battery needs recharging. Check that the trailer battery voltage increases when the
Trailer Power Cable is connected and the vehicle engine is speeded up. If not, check that the
Trailer Power Cable is properly connected. Check also the two heavy, flat kind fuses in the
charging line (80-100A): One in the heavy fuse box on the trailer and another in the heavy
fuse box in the vehicle engine compartment (this fuse box is integral with the diode unit, if
such is used). If still not, then check all screwed connections to the vehicle alternator and in
the two above mentioned heavy fuse boxes for corrosion. If any corrosion, remove screws and
fuses, clean all joints to bare metal and re-assemble. Spray with a corrosion preventer (e.g.
silicone).
If motor did not start at all, then check the motor fuse in the heavy trailer fuse box and
exchange if necessary, then press again LC button and check motor.
If motor fuse is OK and motor will still not start, then press e.g., a small screwdriver into the
hole in the end cap of the motor relay (end opposite to the terminals) to activate the relay
mechanically. This must cause the motor to run.
If the motor did not run, then check if the other heavy terminal of the relay (connected to the
motor) carries voltage when relay pulls. If so, check motor brushes. If not, then the relay
contact must be defective, and the relay should be exchanged.
Note that brush exchange should only be performed by qualified personnel (e.g. by Dynatest).
17.5 Revealing hyd. leakage error
A hydraulic leakage can cause one or more of the following errors:
E1) The weight drops prematurely.
E2) The weight slides down (without dropping).
E3) The plate slides down.
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