12
Installation and maintenance
LSRPM - PLSRPM
Synchronous permanent magnet motors
LEROY-SOMER
4155 en - 2012.05 / e
Motors are supplied as standard with terminal boxes pre-drilled and threaded without cable glands.
A
Standard
position
Standard
position
2
4
1
3
2.5 - Connection to a drive
2.5.1 - Terminal box
Placed as standard on the top of the motor near the drive end,
for forms IM B3 and B5, the terminal box has IP 55 protection.
Warning: The position of the terminal box cannot be easily
modified, even with flanged motors, as the condensation drain
holes must be at the bottom.
Using a cable gland
(NFC 68 311 and 312 standards)
If the position of the cable gland has not been correctly speci-
fied on the order, or is no longer suitable, the symmetrical
construction of the terminal box enables it to be turned in any
of the 4 directions except for position (2) on flange-mounted
motors (B5).
A cable gland must never open upwards.
Check that the incoming bend radius of the cables prevents
water entering via the cable gland.
Tightening capacity of cable glands
(NFC 68 311 and 312 standards)
Type and cable size capacity of cable glands
Cable gland type
Cable size capacity
Min. cable Ø
(mm)
Max. cable Ø
(mm)
ISO 16
6
11
ISO 20
7.5
13
ISO 25
12.5
18
ISO 32
17.5
25
ISO 40
24.5
33.5
ISO 50
33
43
ISO 63
42.5
55
Adapt the cable gland and
its reducer, if fitted, to the
diameter of the cable being
used. In order to maintain the
motor’s original IP55 protection,
it is essential to ensure the cable
gland provides a total seal by tightening it correctly (so
that it cannot be unscrewed by hand).
When there are several cable glands and some are not
being used, ensure that they are always covered and
tighten them so that they also cannot be unscrewed by
hand.
Ø maxi
In certain applications, it is necessary for there to be earth continuity between the cable and the motor earth to ensure protection of
the installation in accordance with the EMC directive, 89/336/EEC. A cable gland option with anchorage on armoured cable is therefore
available across the whole range of synchronous motors with magnets.
2.5.2 - Cross-section of the power supply
cables
The higher the current, the greater the voltage drop in the
cables (standard NFC 15.100 or end user’s national standard).
The voltage drop must therefore be calculated
for the motor
rated current indicated on the nameplate
and acceptance
will depend on the application and the type of cable.
Ø mini
