Connecting External Current Transformers (Cts) - ABB UMC100.3 Manual

I N S TA L L AT I O N

Connecting External Current Transformers (CTs)

If the nominal motor current I
mary current flow in a smaller secondary current according to the transmission ratio. This smaller current is then measured from
the UMC100.3. With the parameter Current Factor the current transformer transmission ratio can be configured. So the UMC100.3
knows the actually flowing primary current which is then used for the internal processing. The current transformers CT4L/5L are
available as accessories for the UMC100.3.
For the connection between CT and UMC use wires with a cross section of 2.5 mm² at a distance < 2 m. The burden
of the CTs has to be below 60 mW. If the supervision of the phase order is active or a voltage module should be
used:
• take care of the correct phase sequence and feed through direction of the main motor wires through the CT4L/5L
• take care of the correct phase sequence and feed through direction of the wires between CT4L/5L and UMC.
CT- Nominal
type current range
of motor [A]
UMC100 CT 0.24-63
built-in
CT4L185R/4 60-185
CT4L310R/4 150-310
CT5L500R/4 200-500
CT5L850R/4 400-850
Order data see catalogue
1)
L1 L2 L3
CT4L185R/4
CT4L310R/4
CT5L500R/4
CT5L850R/4
1
6
M
—
Wiring scheme when using ABB CT4L/5L current transformers
is above 63 A an external current transformer (CT) must be used. The external CT transforms the pri-
e
Max. current [A] Current factor
(Accuracy 3%) (Default = 1.0)
630
1480
2480
4000
6800
5 3 1
L1
Power
6 4 2
Secondary Factor to be set
current at in the UMC (e. g.
nominal primary
current range [A]
1 -
46.2 1.3 - 4
77.5 1,94 - 4
125 1,6 - 4
212.5 1,88 - 4
L1
L2 L3
M
L1 NC L3
NC L2 NC

1 C a 1 C b 2 C a 2 C b
RDY
Diag
L1
ERR
DOC DO0 NC
M
0V 24V DC NC
via LCD panel)
100 (default)
DT450/A185 -> AF145, AF185
4620
7750 DT450/A300 -> AF210-AF300
12500 DT500AF460L-> AF400, AF460
21250 DT800AF750L -> AF580, AF750
UMC
L2
L3
CT4L185R/4
CT4L310R/4
UMC
L2
L3
CT5L500R/4
CT5L850R/4
25
Link kit 1)
-