English (GB)
5
3.3 Avoiding condensation in the motor
If the liquid temperature falls below the ambient
temperature, condensation may form in the motor
during standstill. Condensation can occur in moist
surroundings or areas with high humidity.
In such cases, use a motor suitable for condensing
environments such as an IPX5 motor available from
Grundfos.
Alternatively, open the bottom drain hole in the motor
flange by removing the plug. See fig.
. This reduces
the motor enclosure class to IPX5.
Fig. 3
Motor drain plug
The open drain hole helps prevent condensation in
the motor as it makes the motor self-venting and
allows water and humid air to escape.
3.4 Electrical connection
Carry out the electrical connection according to local
regulations.
Check that the supply voltage and frequency
correspond to the values stated on the nameplate.
3.4.1 Power supply cable
In order to comply with the EN 60335-1 standard, the
power supply cable must as a minimum be rated for
an operating temperature of 105 °C (221 °F).
3.4.2 Motor protection
Single-phase motors, 1 x 115/230 V, 60 Hz
These motors do not incorporate motor protection
and must be connected to a motor-protective circuit
breaker which can be manually reset.
Set the motor-protective circuit breaker to maximum
1.15 x I
1/1
.
Other single-phase motors
These motors have built-in current- and
temperature-dependent motor protection in
accordance with IEC 60034-11 and require no further
motor protection. The motor protection is of the TP
211 type which reacts to both slow- and quick-rising
temperatures. The motor protection is automatically
reset.
Three-phase motors up to 3 kW
These motors must be connected to a
motor-protective circuit breaker which can be
manually reset.
Set the motor-protective circuit breaker to maximum
1.15 times full-load current.
T
M
06
97
67
33
17
Pos. Description
1
Motor drain plug
1
DANGER
Electric shock
Death or serious personal injury
- Before starting any work on the product,
make sure that the power supply has
been switched off and that it cannot be
accidentally switched on.
- The pump must be connected to an
external all-pole main switch according
to local regulations.
- The product must be earthed and
protected against indirect contact in
accordance with local regulations.
- Wires connected to supply terminals,
must be separated from each other and
from the supply by reinforced insulation.
Summary of Contents for CMV 3
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