MAX Power VIP250-HYD - Manual (Page 11)

VIP 250, Hydraulic with Electronic Controller 25/12/2005
11
5 ELECTRICAL SYSTEM INSTALLATION
It is important that a qualified marine electrician does the electrical installation, since an
incorrect electrical installation will result in the rapid deterioration and/or failure of the unit.
All electrical components (Electro Hydraulic Pump, Directional Control Valve, Electronic
Control Box, etc.) should be installed in dry and ventilated areas.
Under no circumstances should any inflammable products be stored next to the electrical
components of the thruster.
When choosing cable sizes and the battery bank size and type, special care should be given to
voltage drops, since excessive voltage drops will cause premature failure of motors and relay
contacts.
Great care should be taken to correctly tighten all electrical connections.
Voltage drops in the power circuit will cause relay and brush failure. Special attention must be
given to the battery’s quality, capacity and condition, and correct cable sizes must be selected.
The minimum voltage should be 21V at the Electro Pump terminals with the thruster running,
boat in water and batteries being charged.
The installation of a manual and/or electric battery isolator and power fuse in the Electro-
Pump’s positive power line is essential.
Please Note: When using a manual battery isolator it must be visible, clearly marked and easily
accessible.
The Electro-Pump does not have a specific polarity.
5.2 POWER CABLE SELECTION (for Electro pump models):
According to the ISO 10133 standards: “The length and cross sectional area of conductors in
each circuit shall be such that the calculated voltage drop shall not exceed 10% of the
nominal battery voltage at any appliance if the circuit is switched on at full load”.
The cable lengths as given in the table below are the total length of the positive cable,
measured from the thuster battery bank to the thruster, plus the total length of the negative
cable measured from the thruster back to the battery bank.
When choosing or calculating the cable size needed for your thruster installation, do not
forget to take into account the thermal rating of the conductor insulation which are directly
related to the ampacity (current carrying capacity) of the cable. Always try to use cables with
the highest thermal insulation rating available or at least 85° - 90°C.
Cable lengths
To and from batteries/relay
VIP 250 DUO
HYD
1 m (2 x 0.5m) 95 mm²
3 m (2 x 1.5m) 120 mm²
5 m (2 x 2.5m) 150 mm²
10 m (2 x 5m) 190 mm²