L1 L2 L3
1Ca 1Cb
2Ca 2 Cb
RDY
Diag
ERR
0V 24V DC NC
DOC DO0 NC
NC L2 NC
L1 NC L3
CT4L185R/4
CT4L310R/4
CT5L500R/4
CT5L850R/4
UMC
CT5L500R/4
CT5L850R/4
M
UMC
L1
L2
L3
CT4L185R/4
CT4L310R/4
M
L1
L2
L3
5 3 1
6 4 2
M
1
6
Power
Connecting External Current Transformers (CTs)
If the nominal motor current I
e
is above 63 A an external current transformer (CT) must be used. The external CT transforms the pri-
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-
type
Nominal
current range
of motor [A]
Max. current [A]
(Accuracy 3%)
Current factor
(Default = 1.0)
Secondary
current at
nominal primary
current range [A]
Factor to be set
in the UMC (e. g.
via LCD panel)
Link kit
1)
built-in
- -
1)
Order data see catalogue
—
Wiring scheme when using ABB CT4L/5L current transformers
L1 L2 L3
25
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