EBARA ENR Instruction And Maintenance Manual page 21

6.4 Electrical installation
Verify a correct cooling of the motor keeping clear
the inlets and outlets of air. It is advisable to ins-
tall the equipment in a ventilated place, away
from heating sources.
- The condensation evacuation holes must be
placed in the lower part of the motor. When there
is no risk of damaging the motor protection, the
drain plugs can be removed.
6.4.1 Electrical connections
Electrical connections must be undertaken by
qualified staff and always with the power supply
off.
- Use cables with an adequate section to conduct
the maximum current used by the motor, thus
avoiding, overheating and / or voltage drop
A) D.O.L.
(UP TO 5.5 kW)
Threephase motor double voltage
(230/400V y 400/690V)
Lower voltage
(DELTA CONNECTION)
6.4.2 Electrical maintenance
Every operation to the motor must be done at
switch off position and disconnected from power
Upper voltage
(STAR CONNECTION)
(maximum voltage drop at starting up the motor
must be lower than 3%).
- Cables must arrive to the terminal box with a
bend that will not
allow water inlet sli-
ding through them.
- Contact surfaces of the connections must be
kept clean and protected from corrosion. Do not
put any washers or nuts between the motor ter-
minals and the power supply terminals.
- Verify the stuffing box seal, to guarantee the
protection shown on the nameplate.
- Avoid transmission of mechanical forces to the
motor terminals.
- Respect the voltage and frequency limits indica-
ted on the motor nameplate.
- Make the connections, depending on case,
according to Fig. 3.
It is recommended to install a short circuit over-
load breaker to prevent possible accidents from
electrical discharge, as well as a motor overload
protector to avoid damages due to overheating.
B) STAR-DELTA
(RECOMMENDED FROM 5.5 kW UP)
Threephase motor double voltage
Fig. 3
supply.
- Frequently verify that the installation and elec-
trical connections specifications are respected.
(ENGLISH)
21