Catalog

1
IEC Squirrel-Cage Motors
Introduction
General technical data
For pole-changing motors with two separate windings, the number
of temperature sensors must be doubled.
Two sets of three temperature sensors are used if a warning is
required before the motor is shut down (tripped). The warning is
normally set to 10 K below the tripping temperature.
Motor protection with PTC thermistors with 6 embedded temperature
sensors for tripping and alarm.
In the connection box, 4 auxiliary terminals are required.
Order code A12
• All 1LA8 motors are equipped in the standard version with
6 PTC thermistors for alarm and tripping.
• For 1LA, 1MJ and 1LG motors, the tripping temperature corresponds
to PTC thermistors for temperature class F.
• For 1LA8, 1LL and 1PQ motors, the tripping temperature corresponds
to PTC thermistors for temperature class F, also for
1LA8 in Zone 22.
• For 1LA and 1LG motors for Zones 2, 21, 22 or VIK thermistors
temperature class B for Zone 2 and VIK (see catalogue section
“Motors operating with frequency converters”).
In order to achieve full thermal protection it is necessary to combine
a thermally delayed overcurrent release and a PTC thermistor.
For full motor protection implemented only with PTC thermistors,
please enquire.
Motor temperature detection with converter-fed operation
KTY 84-130 temperature sensor
This sensor is a semi-conductor that changes its resistance
depending on temperature in accordance with a defined curve.
R
k
3
2.5
2
1.5
1
0.5
0
0
D = 2 mA
G_M015_EN_00190
50 100 150 200 250 °C 300
KTY 84-130 temperature sensor characteristic
Some converters from Siemens determine the motor temperature
using the resistance of the temperature sensor. They can be
set to a required temperature for alarm and tripping.
U
Motor temperature detection with embedded temperature sensor
KTY 84-130.
In the connection box, 2 auxiliary terminals are required.
The maximum number of auxiliary terminals in the main connection
box of the motor is specified under “Number of auxiliary terminals”
in the section “Motor connection and connection boxes”.
An auxiliary connection box is required when the total number of
auxiliary terminals in the connection box of the motor exceeds
the specified values. For an additional charge, the connections
can be routed through a separate auxiliary connection box
(order code L97, M50 or M88, see “Auxiliary connection box” in
the section “Motor connection and connection boxes”).
Order code A23
For 1LA8 motors, the standard PTC thermistors are omitted when
ordering with order code A23.
OR
Motortemperature detection with embedded temperature sensors
2 x KTY 84-130.
In the connection box, 4 auxiliary terminals are required.
Order code A25
The temperature sensor is embedded in the winding head of the
motor in the same manner as a PTC thermistor. Evaluation is performed,
for example, in the converter.
For line-fed operation, the temperature monitoring device 3RS10
that is part of the protection equipment can be ordered separately.
For further details, see Catalogue LV 1,
Order No.: E86060-K1002-A101-A4.
Motor protection
1LA and 1LG motors for Zones 2, 21 and 22 for converter-fed operation
already have a PTC thermistor for tripping as standard.
For converter-fed operation, a PTC thermistor for alarm can be
ordered additionally.
PTC thermistor for alarm for converter-fed operation in Zones 2,
21 and 22.
In the connection box, 2 auxiliary terminals are required.
Order code A10
1MJ motors:
PTC thermistors must always be used if the duty is not S1
(continuous operation) in accordance with IEC 60034-1/
DIN EN 60034-1.
If 1MJ motors are operated with converters, the PTC thermistor
in the winding is essential. For 1MJ6/1MJ7 motors, an additional
PTC thermistor is installed in the connection box.
Motor protection with PTC thermistors for converter-fed operation
with 3 or 4 embedded temperature sensors for tripping
In the connection box, 2 auxiliary terminals are required.
Order code A15.
or
Motor protection with PTC thermistors for converter-fed operation
with 6 or 8 embedded temperature sensors for alarm and
tripping.
In the connection box, 4 auxiliary terminals are required.
Order code A16.
For versions with temperature sensors, in some cases, anti-condensation
heaters cannot be mounted or can only be mounted
for certain frame sizes. See “Special versions” in the corresponding
sections of the catalogue.
If thermistor protection is required, 3 PTC thermistors connected
in series are embedded in the stator winding of the motor.
The 3RN1 temperature monitoring device that is part of the protection
equipment must be ordered separately - it is PTB certified.
For further details about mode of operation, circuit and
prices, see Catalogue LV 1,
Order No.: E86060-K1002-A101-A4.
1/34 Siemens D 81.1 · 2006