Danfoss iSave 50, Руководство по эксплуатации

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Design Guide | APP and iSave overload protection
59
180R9357 | AQ265943679828en-00100
2
IOM iSave 50 - 70 | 0
3
.202
3
2. APP pump and iSave
overload protection
When protecting the pump and iSave against
overload
both the maximum torque and
maximum pressure must be taken into
account.
- Maximum allowable operation torque is the
maximum torque the product can handle in
normal operation.
- Maximum allowable operation torque is the
maximum torque the product need in a
specificl operation.
2.1 Maximum torque
Start up:
•
Ramp up speed from 0 to set-point
• The starting torque must not exceed maxi-
mum Starting Torque according to chapter 5.
Ongoing operating:
•
Continuously the torque must not exceed
120% of maximum Allowable Operating
Torque for more than 30 sec.
• Periodically the torque can for a very short
time go up to maximum Starting torque.
Example #1
0
20
40
60
80
100
120
140
160
0 10 20 30 40 50 60 70 80 90 100 100 100 100 100
Pe
rc
en
t
of
m
ax
lo
ad
Percent of design speed
Load Protection
VFD setting: According to maximum allowable operating torque
Torque
Max starting torque
30 sec
20% overload
30 sec
20% overload
Max allowable operating torque
0
20
40
60
80
100
120
140
160
0 10 20 30 40 50 60 70 80 90 100 100 100 100 100
Pe
rc
en
t
of
m
ax
lo
ad
Percent of design speed
Load Protection
VFD setting: According to actual load
Torque
Max starting torque
30 sec
20% overload
30 sec
20% overload
Maximum Operating torque
Maximum allowable operating torque
Example #2