User Manual Manual

Applications/Wiring 9-8
Publication 825-UM001B-EN-P January 2001
Two-Speed Motors with Primary Current Transformer
When a primary current transformer is used, two-speed motors of any rating can be
protected.
Primary Circuit
Figure 9.9 Two-Speed Application Utilizing Primary Current Transformer
Separately Ventilated Motors
Because they are cooled constantly, separately ventilated motors exhibit the same thermal
behavior when stationary as when running. Consequently, the cooling ratio must be set to 1.
LCD:
For setting the cooling ratio, refer to Chapter5.
825-MCM
2 (20)
825-M
L1 L2 L3
L1 L2 L3
K2
K1
N
(-)
R
L
(+)
825-MST
Y41Y42
24 V AC/DC
8 mA
100-M05
100-M05
(I) (II)
K1
K2
... A / 1 (5) A
(I) (II)
... A / 1 (5) A
M
3 ~
220...230V AC/DC: R = 27kΩ / 5W
110...120V AC/DC: R = 12kΩ / 4W
24V AC/DC R = 0Ω
For setting the second rated current (speed II)
refer to Chapter 5 “Control input #2“
Secondary circuit
COOL-CONST RATIO
1.00