Technical data

Manual – Gear Units and Gearmotors
125
7
Forced cooling fan
Project Planning for AC Motors
7.14 Forced cooling fan
Forced cooling
fan VR, VS and V
The motors can be equipped with a forced cooling fan if required. A forced cooling fan
is usually not required for mains operated motors in continuous duty. SEW-
EURODRIVE recommends a forced cooling fan for the following applications:
• Drives with high starting frequency
• Drives with additional flywheel mass Z (flywheel fan)
• Inverter drives with a setting range ≥ 1:20
• Inverter drives that have to generate rated torque even at low speed or at standstill.
Following figure shows a typical speed-torque characteristic for a dynamic inverter drive,
for example with MOVIDRIVE
®
MDX61B with DEH11B option in CFC operating mode.
A forced cooling fan must be used if the load torque in the 0 ... n
base
is above curve 1.
The motor becomes thermally overloaded without forced cooling.
VR forced cooling
fan
The VR forced cooling fan is supplied with a voltage of DC 24 V. For voltage supply with
1 × AC 230 V, SEW-EURODRIVE offers switched-mode power supply type UWU52A
(part number 188 181 7).
Switched-mode power supply UWU52A is mounted on a support rail in the control
cabinet.
Combination with
encoders
Forced cooling fans can be combined with the following motor encoders:
VR forced cooling fans can be combined with any encoder from SEW-EURODRIVE.
Forced cooling fans VS and V can be combined with encoders with solid shaft only. In
DV250M/DV280S motors, the motor encoder can only be installed in conjunction with a
forced cooling fan.
GM
01651BXX
Figure 62: Speed/torque characteristic curve in CFC operating
mode
T
N
= Rated torque of the motor 1 = With self-cooling
T
max
= Maximum torque of the motor 2 = With forced cooling
n
base
= Rated speed (transition speed) of the motor 3 = Maximum torque
x
2
1
3
Motor encoder For motor size
Forced cooling fan
VR VS V
ES1T, ES1R, ES1S, ES3H, AS3H 71 ... 100 • --
ES2T, ES2R, ES2S, ES4H, AS4H 112 ... 132S • --
EV1T, EV1R, EV1S 71 ... 132S ••-
EV1T, EV1R, EV1S 132M ... 280 --•
AV1Y, AV1H 71 ... 132S ••-
AV1Y, AV1H 132M ... 280 --•