Leroy-Somer CPLS 112, Руководство по установке и обслуживанию

Страница: 9 / 28

9
INSTALLATION AND MAINTENANCE
CPLS drip-proof 3-phase induction motors
4240 en - 2014.09 / b
LEROY-SOMER
Built-in thermal protection (standard)
CPLS motors are fitted with 3 PTC sensors in the winding as
standard (one per phase). These sensors can be used to
monitor temperature rises at “hot spots” in order to detect an
overload or faulty cooling.
It must be emphasized that under no circumstances can these
sensors be used to carry out direct regulation of the motor
operating cycles.
Thermal protection (optional)
- PTO or PTF, in the control circuit
For low rated currents, bimetallic strip-type protection may be
used. The line current passes through the strip, which shuts
down or restores the supply circuit as necessary. The design
of this type of protection allows for manual or automatic reset.
- PT100 or Thermocouples, with reading equipment
(or recorder) for continuous surveillance.
Alarm and safety
All protective equipment can be backed up by another type of
protection (with different NRTs). The first device will then act
as an alarm (light or sound signals given without shutting down
the power circuits), and the second device will be the safety
system (shutting down the power circuits).
Space heaters (optional)
A glass fibre flexible resistor is fixed on 1 or 2 coil end turns.
This resistor heats the machines when stopped and thus
prevents condensation inside the machines.
Power supply: 230 V single-phase, 50 or 60 Hz, unless
otherwise specified by the customer.
Bearing protection
CPLS HV3 motors are fitted (as standard) with PTO sensors
(NC bimetallic strip) in the end shields, in order to cut the power
in the event of abnormally high bearing temperatures.
These sensors can be fitted on the whole range (as an option),
or replaced by PT100s for continuous surveillance.
Built-in indirect thermal protection
Type Operating principle Operating curve
Breaking
capacity (A)
Protection provided
Mounting
Number of devices*
Normally closed
thermal protection
PTO
Bimetallic strip, indirectly
heated, with normally
closed (NC) contact
I
O
T
I
F
T
R
T
V
T
R
T
2.5 at 250 V
with cos j 0.4
General surveillance
for non-transient
overloads
2 or 3 in series
Normally open
thermal protection
PTF
Bimetallic strip, indirectly
heated, with normally
open (NO) contact
2.5 at 250 V
with cos j 0.4
General surveillance
for non-transient
overloads
2 or 3 in parallel
Positive
temperature
coefficient
thermistor
PTC
Non-linear variable
resistor, indirectly heated
0
General surveillance
for transient overloads
3 in series
Thermocouples
T (T<150°C)
Copper Constantan
K (T<1000°C)
Copper-nickel
Peltier effect 0
Continuous surveil-
lance of hot spots at
regular intervals
1 per hot spot
Platinum
resistance
thermometer
PT 100
Linear variable resistor,
indirectly heated
0
High accuracy
continuous surveil-
lance of key hot spots
1 per hot spot
- NRT: nominal running temperature
- The NRTs are chosen according to the position of the sensor in the motor and the temperature rise class.
NRT
NRT