Specifications

72
Motor characteristics,
connection, protection
Single-phase motors
Specific internal protection
Voltage range change
The information below is given as a recommendation.
The user must comply with the electrical standards or recommendations (IEC, VDE,
UL, CSA, etc.) applicable in the country in which the pump is used.
The use of electrical protection for the pump motor makes it possible to protect:
- The motor: in the event of excess voltage or rotor blocking, the resulting excess
current may destroy the coil and possibly the start-up system (for a single-phase
motor).
- The pump: in the event of a lubrication fault (contaminated oil, presence of
particles), increased resistance will draw excessive motor current.
Differential thermal circuit-breakers should be used, in which the mechanism contains
an instantaneous disconnection controlled by a bi-metal blade.
Never protect a three-phase motor with fuses not equipped with a differential system:
if three phase motors are powered on 2 phases without a differential system, the
motor could burn.
➧ single-phase motor:
The table on the following page gives the characteristics at start-up (for temperatures
≥ 12°C) and in permanent operation.
In this table, you will find, for each pump, a standard fuse or motor-associated value.
➧ three-phase motor:
The table on the following page gives, for each pump, the electrical characteristics in
permanent operation and the proposed circuit breaker.
Single-phase motors have a thermal circuit switch with automatic starting device (CSA
standard): when the internal motor temperature reaches a value over the preset limit
value, the motor stops. However, when the motor is cooled, it will start-up again
automatically.
The voltage range can be read beside the motor switch: the dual frequency
single-phase motor can be configured for low voltage (LV) or high voltage (HV).
To change this type of connection, proceed as follows:
- make sure that the motor is not switched on, and the power cord is removed,
- unfasten the 4 attachment screws on the motor upper cover and remove it,
- remove the voltage selector cover marked with the voltage, press on the voltage
selector (position II).
- invert the position of the voltage selector cover in order to show the other voltage
at the outside of the motor cover: “HV“ for high voltages, or “LV” for low voltages.
Check to be sure that the voltage selector has fully latched the rocket switch when
the voltage selector cover is replaced.
- install the upper cover and refasten the 4 screws.
- secure the upper cover as follows:
• Center it on the front motor flange,
• Install the connector between the relay and condensor,
• Close the upper cover,
• Install and tighten the 4 screws, starting installing the screws on the pump
handle side first.
External motor protection, electrical protection