9
Motor
Manual
5 Electrical connection and cabling
The motors are designed to operate with supply variations
conforming to IEC 60034-1, Zone A: ±5% voltage and ±2%
frequency. The motors will operate with greater variations
according to Zone B of IEC 60034-1 section 7.3, but with larg-
er variation in performance.
Three-phase motors manufactured by Hoyer Motors are
designed according to IEC 60038 and IEC 60034-1 and can
operate with the rated power and torque load within the
mains voltage and frequency variations of zone A and, for a
short time, of zone B.
Single-phase Hoyer motors can operate under these condi-
tions with mains voltage and frequency variations of ±5%
and ±1%, respectively. If the voltage variation is greater, sin-
gle-phase motors can only be operated with the torque load
adjusted in proportion to the voltage dip.
Earthing must be carried out according to local regulations
before the motor is connected to the supply voltage.
5.1 Direction of rotation
Motors are supplied as standard with clockwise rotation as
seen from the drive end. The phase sequence is L1, L2, L3
as connected to the terminals shown in Figure 1. To change
the direction of rotation, change the phase sequence by (for
example) swapping L1 and L2. If the motor is unidirectional,
make sure the shaft rotates in the same direction as the
marked arrow.
5.2 Terminal box and terminal board
The terminal box contains the earthing terminal, terminal
board and terminals for heating elements and temperature
sensors (PTC and Pt100). Other auxiliary devices may also
be located in the terminal box. Hoyer motors are equipped
with three PTC sensors as standard. Heating elements are
common in Hoyer marine motors with frame size 160 or
larger.
Before working on the motor or attached machinery:
• Ensure that all supply voltages are switched off and
protected against reactivation.
• Switch off auxiliary power circuits for accessories such
as anti-condensation heaters.
• Check the supply voltage and frequency by comparing
them with the rated data on the nameplate and the
data sheet.
• Ensure that the terminal box is clean and dry.
• Close unused cable glands with blind caps.
• Check the terminal box cover gasket before refitting.
Always use suitable cable lugs for connection of all main
supply cables and cables for auxiliary devices, and ensure
that cables are corrected to the correct terminals.
Unless otherwise stated, motors are only intended for fixed
installation. Cable glands/blind caps for entry points are met-
ric. If cable glands or blind caps are replaced, the replace-
ments must be at least the same IP class as the existing items.
Connection diagrams for the main supply and accessories
such as PTC sensors or heaters are located inside the termi-
nal box or cast in the terminal box cover.
All crimped connections should be made according to
IEC 60352-2.
Tightening torques for terminal board studs:
Thread M4 M5 M6 M8 M10 M12 M14 M16 M20
T (Nm) 1.8 2.5 3.5 7.0 12 18 35 55 80
Table 1 Terminal board tightening torques
Tightening torques for terminal box cover:
Thread HMA -
M4
HMC -
M4
HMA -
M5
HMC -
M5
M6 M8 M10 M12
T (Nm) 1.1-1.3 2-4 1.1-1.3 2-4 6-8 15.5-17.5 31-35 56-60
Table 2 Terminal box cover tightening torques
To comply with EMC requirements and provide proper
earthing, cables must be shielded and EMC cable glands are
recommended. All incoming parts must have the same po-
tential as the motor.
Cable glands and seals in cable entries must be suitable
for the type and diameter of the cable concerned (clamp-
ing range). It is recommended that cables are mechanically
protected and clamped close to the terminal box to fulfil the
requirements of IEC 60079 and local requirements.
To Next Page
Loading...
