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To provide correct function the measuring voltage on L1/L2 has to be at
least 20 V.
Load monitoring claims a symmetric load on all 3 phases as you have it
usually with motors. The unit can also be used for single phase monitoring
by bridging terminals L2 and L3 (the display then shows U
min
= 0).
Overload within the current range is indicated by fast flashing of the LED.
Remarks
The LED indicate the state.
green LED U
N
:
on, when auxiliary voltage present
red LED (flashes)
at overload at current path
orange LED:
No measurement, unit in input mode
Indication
Cursor LCD Display
Setting
Active manual reset
Manual reset activated: flashes when me-
mory mode is ON and relay in failure state.
Reset with button "
"
Contact state of the output relays
Circuit Diagrams
L1/i
k
L2 L3
11
A1
+
12
A2
14
M10139
11
12 14
21
11
A1
L3
L2
k
22
12
24
14
A2
M10140
11
12 14
21
22 24
L1/i
MK 9300N.11
MH 9300.12
Function
After connecting the auxiliary supply to terminals A1-A2 the startup delay
disables the monitoring function so that changes on the input have no
influence on the relay output of the VARIMETER PRO. The device is in
display (RUN) mode and continuously measures the actual values. The
buttons
and
toggle between the different values. Pressing
Esc
for
more than 3 sec starts the input mode.
One or more measuring values can be assigned to the relay output. If the
setting value of at least one function is exceeded the relay switches and
the display indicates this state. The display is inverted, flashes and shows
measuring function and fault.
The fault memory is selectable
With button
the fault memory can be deleted.
On the unit MH9300 it is possible to assign different values to the different
relays so one can be used as pre-warning and the other as alarm output.
Relay output 1 switches when actual value exceeds the pre-warning setting
of at least one assigned measuring function.
If a second setting assigned to relay output 2 with the same measuring
function the unit gives an Alarm signal.
Connection Terminals
Terminal designation
Signal designation
A1 (+), A2
Auxiliary voltage AC or DC
L1/i, L2, L3
Voltage measuring input AC
L1/i , k
Current measuring path AC
11, 12, 14
Indicator relay (C/O contact)
21, 22, 24
Indicator relay (C/O contact)
M10933_a
Display “Rel.2” active
Display “Rel.1” active
Selection of
Functions/Setting and
measuring values
Change to setup mode (3...6s)
Change to Run mode (3...6s)
LED status indication
Error memory 1 active
Error memory 2 active
