installation &
operating instructions
Design Envelope
4300
&
4380
Vertical In-line Pumping Unit
10
2.1.3 additional motor protection
With the exception of supply fuses / MCB’s to protect
the installation (for over-current and short-circuit
protection), no additional overload or over-tempera-
ture protection is required (i.e. thermal overloads).
Protection features include:
•
Mains phase loss
•
Over voltage
•
Under voltage
•
Electronic thermal motor protection
•
Short circuit on motor terminals
•
Ground fault on motor terminals
•
Over temperature
2.1.4 motor thermal protection and derating
The Design Envelope motors are thermally protected in case
limits are exceeded (
140°c
), another protection is provided
thought the drive.
2.1.4.1 derating for ambient temperature
The ambient temperature (
tamax
) is the maximum tempera-
ture allowed.
If the motor is operated at temperatures above
104°f (40°c)
,
a derating of the continuous output current is necessary.
2.1.4.2 derating for air pressure
Below
1000
m altitude no derating is necessary. Above
1000
m the ambient temperature (
ta
) or max. rated output cur-
rent (
in
) must be de-rated in accordance with the following
diagram.
See the below diagram for derating of output current versus
altitude at
ta
= Max.
104°f (40°c)
2.1.4.3 derating for running at low speed
When a centrifugal pump or a fan is controlled by a
4300
&
4380
Motor, it is not necessary to reduce the output at low
speed because the load characteristic of the centrifugal pumps/
fans, automatically ensures the necessary reduction.
The
4300 & 4380
iECM motors running constant load torque
applications continuously at low speed must be de-rated (see
diagram) or an independent fan must be used.
In the iECM all control terminals are supplied from or in con-
nection with extra low voltage (
pelv
).
The components that make up the electrical isolation, as de-
scribed below, also comply with the requirements concerning
higher isolation and the relevant test as described in
en 50178
.
The galvanic isolation can be shown in three locations (see
drawing below),namely:
1
Power supply (
smps
) including signal isolation of VDCbus,
indicating the intermediate voltage.
2
Gate drive that runs the IGBTs (opto couplers)
3
DCbus Voltage transducer (opto couplers)
0
20
40
60
80
100
120
20
30
40
50
60
70
output current
t ambient [°c]
derating for abmient temperature
0
20
40
60
80
100
0
500
1000
1500 2000
2500 3000 3500
rated torque [%]
altitude [m]
derating for air pressure
0
20
40
60
80
100
0
1000
2000
3000
4000
rated torque [%]
rated speed [rpm]
derating for running at low speep
Содержание Design Envelope 4300
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