SEW-Eurodrive WPU 1001 User manual

08/121/92
0921 4410 / 0498
Smooth pole-change unit WPU
for pole changing motors
Installation and Operating Instructions
Edition 04/98

2 Smooth pole-change unit WPU
1Description
Smooth pole-change units WPU optimize the operational performance of pole-changing motors
for applications where smooth changing from high to low speed is required.
The regenerative brake torque when switching from high to low speed can – depending on the
design and frame size of the motor – for a short time reach three to nine times the rated torque of
the low-speed winding.
The smooth pole-change unit WPU reduces this regenerative change-back torque to approx. one
third of the above mentioned values.
When the change-back braking process is initiated, the integrated electronic circuit, using a wear-
free switching element (Triac), opens one phase of the motor power supply.
The breakaway and rated torques of the motor are not effected by this at all.
Smooth pole-change units WPU 1001/1003 and 1010 are designed as modular units for top-hat
rail mounting with screw terminals.
Units WPU 1001 and 1003 come without heatsink; WPU 1010 is provided with a heatsink,
mounted on the side of the housing.
WPU 2030 is designed for switch cabinet installation. This unit has a heatsink integrated in the rear
of the housing.
Characteristics:
•precise, automatic reconnection of the third phase after change-back – current-and speed-opti-
mized in the synchronous point – completely load-independent
•no loss of energy, high efficiency
•wear-free
•full starting torque
•unlimited starting frequency
•minimal wiring requirements
•suitable for use with any pole-changing motor

Smooth pole-change unit WPU 3
Installation/
Circuit wiring diagram 2
When installing the unit, please observe the following mechanical and electrical requirements:
•Important: Ensure that the unit is sufficiently cooled!
• Ensure protective earthing of WPU 1010 and WPU 2030.
• The lead cross-sections are to be dimensioned depending on the motor connected.
Maximum lead cross-section: WPU 1001/WPU 1003/WPU 1010: max. 2.5 mm2
WPU 2030: max. 16 mm2
• The fuses are to be chosen in accordance with the lead cross-section and the connected motor.
As overload protection for the WPU, a motor circuit-breaker with instantaneous magnetic
tripping may be used. It is to be interconnected in the lead of the low-speed winding and to be
adjusted to the rated current of this winding (please refer to page “Technical Data”)
The unit is to be installed by qualified electrical personnel only, in strict compliance with the
applicable regulations for the prevention of accidents and the installation and operating
instructions!
Type Maximum permissible
ambient temperature Necessary cooling clearance
at the sides top and bottom
WPU 1001
+ 45 °C
–
70 mmWPU 1003 35 mm
WPU 1010 –
WPU 2030 – 100 mm

4 Smooth pole-change unit WPU
2Installation/
Circuit wiring diagram
Wiring diagram WPU for motors with separate windings
01697AEN
Wiring diagram WPU for tapped wound motors
01698AEN
WPU10..
Motor terminals:
1U/1V/1W: Low speed K1
2U/2V/2W: High speed K2
Motor terminal board
Switch cabinet
Motor
K1 K2
F1
L1
L2
L3
L1 L2
L2’ 1U
1V
1W
2U
2V
2W
L1’
F2
F3
Motor terminals:
1U/1V/1W: Low speed K1
2U/2V/2W: High speed K2 and K3
WPU10..
Motor terminal board
Switch cabinet
Motor
K1 K2 K3
L1
L1’
L1 L1
L2 L2
L2
L2’
L3 L3
1U 1V 1W
2U 2V 2W

Smooth pole-change unit WPU 5
Installation/
Circuit wiring diagram 2
Wiring diagram WPU for motors connected in parallel
01700AEN
CAUTION: The sum of the individual currents may not exceed the maximum permissible current!
Wiring diagrams for WPU 203 0
The wiring diagrams for WPU 2030 are identical to those for WPU 10.. with one exception:
see the following assignments for terminal designations.
WPU 10.. 203 0
Terminal L1
L2
L1’
L2’
2
1
4
3
WPU 10..
Motor terminal
board
Motor terminals:
1U/1V/1W: Low speed K1
2U/2V/2W: High speed K2
K2
K1
L1’
L1
L1
F1
F2
F3
L2
L2
L2’
L3
1U
1U
1V
1V
1W
1W
2U
2U
2V
2V
2W
2W

6 Smooth pole-change unit WPU
3Commissioning
It is recommended to carry out the commissioning with the motor in the cold state.
1. Switch the motor off.
Take appropriate measures to prevent unintentional switch-on of the motor!
2. For hoists and brake motors:
Ensure that the brake is disconnected electrically, i. e. that the brake is applied.
For this purpose, remove the lead at terminal 2 and/or terminal 3 of the brake rectifier.
3. Turn the potentiometer 20 turns in counterclockwise direction (Imin).
Note: The 20-turn potentiometer is provided with a slipping clutch, so no stop can be felt.
4. Connect the motor at low speed.
→The red LED lights up.
The motor does not rotate.
5. Turn the potentiometer in clockwise direction
→The red LED goes off.
Motors without brake: The motor starts rotating.
Brake motors: The motor wants to start rotating, however, is blocked by the
brake and therefore needs to be switched off as soon as
possible.
Leave potentiometer setting at this point.
6. Switch the motor off again.
7. For brake motors with disconnected brake:
Reconnect brake.
8. Carry out trial run.
The setting is correct if
•the motor starts rotating immediately when connected (at low speed), the red LED does not
shine.
•and the red LED lights up when changing from high to low speed. The LED remains lit during the
deceleration process thus indicating its duration.
The setting is incorrect if
•the motor does not start rotating immediately when connected (at low speed), the red LED
shines.
→Turn potentiometer in clockwise direction.
•the red LED does not light up when changing from high to low speed.
→Turn potentiometer in counterclockwise direction.
The unit is to be installed by qualified electrical personnel only, in strict compliance with the
applicable regulations for the prevention of accidents and the installation and operating
instructions!

Smooth pole-change unit WPU 7
Technical Data 4
*) with a starting current of > 3 the WPU must only be selected for S1 continuous operation.
Type WPU 1001 WPU 1003 WPU 1010 WPU 203 0
Part no. 825 742 6 825 743 4 825 744 2 825 745 0
Rated supply voltage Vmains 2 x 150...500 VAC
Mains frequency fmains 50/60 Hz
Rated current IN
(continuous operation S1) 1 AAC 3 AAC 10 AAC 30 AAC
For pole-changing motors with rated current
at low speed IN
(continuous operation S1)
0.2...1 AAC 1...3 AAC 3...10 AAC 10...30 AAC
For pole-changing motors with rated current
at low speed IN
(intermittent operation S3 – cyclic duration factor
40/60 %) *)
0.2...1 AAC 1...5 AAC 3...15 AAC 10...50 AAC
Ambient temperature Ta–15...+45 °C
Enclosure type IP 20
Weight 0.3 kg 0.3 kg 0.6 kg 1.5 kg
Dimensions W x H x D 32.5x77x114 mm 72.5x77x114mm 143x200x80 mm
Mechanical design Top-hat rail mounting with screw terminals Mounted to
switch
cabinet wall
Ia
IN

8 Smooth pole-change unit WPU
5Dimensions
WPU 1001/1003 and WPU 1010
01701AEN
WPU 203 0
01702AXX
1) Heat sink only on WPU 1010 Mounted on top-hat rail EN 55022 - 32 x 7.5
M5
77
32.5 109
L1
L1*
L2
L2*
6
72.5
1)
WPU
150
200
25
2.5 80
130
4.5
10
7.5
143

Service and spare parts
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