WIRING
This wiring example shows how the M20 can be used to control the
starting and stopping circuit of the motor. Other wiring configura-
tions are possible.
1. The current transformer CTMxxx must be placed in the same
phase that is connected to terminal 9, phase L1.
2. For single-phase connection see fig 2.
Fig 1. Connection example
Note!
If the START/STOP is connected according to fig. 1, it is recommended that
terminals 6 and 7 be by-passed during programming. After the programming
is completed the by-pass must be taken out.
3
L1
L2
L3
1
2
S1
S2
M
3
CTMxxx
MONITOR
N
L1
L2
L3
Max.240V AC
N
K1
STOP
START
8
7
6
C
R1
DIG
5
R2
K1
PRE-
ALARM
3
4
A-A+
NOTE!
Inpower
down,bothrelays
arealwaysN.O.
-Reset
-Block
-Autoset
INSIDE THE BOX …
This instruction manual describes the installation and commissioning
of the M20 load monitor. The M20 supervises induction motor driven
equipment and provides alarms when abnormal conditions are
detected. The M20’s ability to provide reliable monitoring & protec-
tion ensures production equipment is optimised and expensive break-
downs and interruptions are minimized. Due to the special method of
subtracting motor power losses, the monitor is able to accurately mea-
sure the shaft power supplied by the motor to the application. This
advanced technique allows the M20 to monitor the “application” load
only as opposed to the “total” motor load, which includes the varying
motor losses.
• Check the delivery. Your shipment should contain the M20 load
monitor, a current transformer and this instruction manual.
• Check carefully that the ordered equipment complies with the
motors input voltage and that the current transformer rating is as
stated on the delivery packaging.
• Check that the contents have not been damaged in shipping.
Note!
If in doubt contact your supplier before starting to install or commissioning
the product.
1
SAFETY
• Study this manual thoroughly before installing and using the
monitor.
• The monitor must be installed by qualified personal.
• Always disconnect supply circuits prior to installing.
• The installation must comply with standard and local regulations.
• Pay special attention to this SAFETY section and the part marked
“CAUTION!” in the OPERATION section.
• Should questions or uncertainties arise, please contact your local
sales outlet or see section 11 SERVICE.
Note!
Do not remove or break the seal on the housing. The warranty will be can-
celled.
2
Fig 4. Example CTM 025 with 2 windings for an 12 A motor.
Fig 5. Example 1 and 3 windings.
Note!
Normally the appropriate Current Transformer (CT) will have been ordered
and shipped with the M20, check that this is the case; contact the supplier
if in doubt.
Note!
The transformer connection and orientation are not polarity sensitive.
L1
L2
L3
1
2
S1
S2
M
3
MONITOR
2windings
CTM025
P2
SELECTION CURRENT TRANSFORMER
FOR MOTORS LESS THAN 100A
1. Check the rated motor current on the motor plate.
2. Compare this value with the current in table 1.
3. From table 1, select the current transformer and the appropriate
numbers of windings.
EXAMPLE:
• Rated motor current = 12A.
• Select 10.1-12.5A from the first colon in table 1.
• This gives:
- CTM025 with 2 windings.
Table 1. CT less than 100A.
Note!
Max length of the CTM cable is 1 m (39.37 in).
RATED MOTOR
CURRENT [A]
CURRENT TRANSFORMER TYPE
NUMBER OF WINDINGS
CTM 010 CTM 025 CTM 050 CTM 100
0.4 — 1.0 10
1.01 — 2.0 5
2.01 — 3.0 3
3.1 — 5.0 2
5.1 — 10.0 1
10.1 — 12.5 2
12.6 —25.0 1
26.0 — 50.0 1
51.0 — 100.0 1
4
Continue
ALTERNATIVE EXAMPLE FOR SINGLE-PHASE
CONNECTION
This wiring example shows the deviant power connection to be made
with regard to a single-phase connection. Refer to fig. 1 for the
remaining wiring.
Fig 2. Single-phase connection example.
EXAMPLE - DIGITAL INPUT
The Digital Input use the terminals 5 (DIG) and 6 (C-reference). It can
have either a VAC or a VDC signal. See also section 7 ADVANCED
FEATURES.
Fig 3. Wiring example for digital input.
3
L1
1
2
M
CTMxxx
MONITOR
N
L1
L2
L3
DIG
K1
8
7
6
C
R1
R2
S1
S2
5
DIG
C
MONITOR
+
-
()~
()~
6
5
EL-FI
®
M20
SHAFT POWER MONITOR
INSTRUCTION MANUAL
Motor shaft output power measurement
Emotron AB
Mörsaregatan 12
Box 222 25
SE-250 24 Helsingborg
Sweden
Tel.: +46 42 169900
Fax: +46 42 169949
www.emotron.com
Protected by utility patent SE 9703952-3
International utility patent application pending WO 9925049
01-2551-01 r1a
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