Page 22 - EPR Catalog 2015

CT-D range
Function diagrams

1F Star-delta change-over
(Star-delta starting)
CT-SDD, CT-SAD A1-A2 2CDC 252 112 F0206
17-18
This function requires continuous control supply voltage for 17-28
timing.
Applying control supply voltage to terminals A1-A2, green LED
energizes the star contactor connected to terminals 17-18
and begins the set starting time t1. The green LED flashes t1 t2
during timing. When the starting time is complete, the first
output contact de-energizes the star contactor. t1 = adjusted starting time
Now, the transition time t2 starts. When the transition time t2 = transition time
is complete, the second output contact energizes the CT-SDD: t2 = 50 ms
delta contactor connected to terminals 17-28. The delta CT-SAD: t2 adjustable
contactor remains energized as long as control supply
voltage is applied to the unit.

L1 F3 2CDC 252 128 F0b06 L1 L2 L3 2CDC 252 012 F0b07

95 135

96 -F1
21
246
22
F2
S1

0

S2 13 53 135 135 135
I -K3 2 4 6 -K1 2 4 6
K2 -K2 2 4 6
14
54

K1T 17 17 13 13
18
K2 K1 154 97 95
98 96
28 14 14 -F2

22 22 326

K3 21 K1 21

A1 A1 A1 A1 -M1 W2
V2
K1T K1 K3 K2 W1 U2

A2 A2 A2 A2 V1 M
U1 3 ~
N

Y ͬ N
Control circuit diagram
Power circuit diagram

1/11 ABB | Catalog Electronic Products and Relays 2015 | 2CDC 110 004 C0210