Instruction Manual ZHK
78/129
V07-19.0
Single-speed motors
Single-speed motors are suitable for direct and star-delta starting. If the wiring to the AHU outside
was done by EUROCLIMA, standard wiring is for direct start. Wiring for star-delta start is possible
on request.
All single-speed motors are suitable for frequency converters. The frequency range of the motor is
shown in
0,1*n
nom
0,6*n
nom
1,0*n
nom
Motor speed
1,0*P
nom
1,75*n
nom
0,1*P
nom
Motor
power
Diagram:
permissible absorbed power = f (speed) for three-phase
motors with radiall fans in frequency converter operation
Permitted workspace
Absorbed power in case of turbulent
flow and operation at nominal speed
Figure 172:
Workspace of single-speed motors
Speed range in which the motor reaches the rated output:
N
n
x 0,6 bis N
n
x 1,75
N
min
= 0,1 x N
n
Minimum performance by N
min
: 0,1 x P
n
P
n
..................... Nom. capacity
N
n
..................... Nom. RPM
N
min
.................. Min. RPM
Two or three speed motors
These motors are always designed for direct start in each stage.
These motors are not suitable for frequency converter! A frequency converter de-
stroys the motor winding!
For ZHK AHUs the following on site equipment is required:
1) Motor without a frequency converter: motor protection switch
A motor protection switch must always be used when the motor is not running with a frequency
converter.
The motor protection switch must be equipped with a thermal switch to protect the motor winding
and with an electro-magnetic switch (short-circuit protection). The function of the motor protection
switch is to protect the motor against destruction by switching all pools in case of:
-
Not start
-
Overload
-
Decrease of mains voltage
-
Failure of a conductor in the three phases power supply
Summary of Contents for ZHK Series
Page 1: ...ZHK INSTRUCTION MANUAL ...
