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9.2.14 Insulation resistance
The insulation resistance to earth is measured on
supply cables as well as on motor windings.
Note:
• The value is shown only if the MP 204 has been
set up for three-phase, earthed operation.
• The insulation resistance is measured when the
pump has stopped. If the trip limit has been
exceeded, the motor is not capable of restarting.
• Terminal "5" must be connected as shown in
figs. 8 and 9.
9.2.15 Cos ϕ
The actual cos ϕ of the motor.
Note: Functions in the case of single- as well as
three-phase connection.
9.2.16 Harmonic distortion
Measured distortion on connected mains.
The heat dissipation in the motor windings increases
with the distortion.
In case of distortion qualities above 15%, the supply
mains should be checked for faults and noisy equip-
ment.
9.3 Menu 3. LIMITS
The MP 204 operates with two sets of limits:
• a set of warning limits and
• a set of trip limits.
Some values only have a warning limit. See the table
in section 16.
If one of the trip limits is exceeded, the trip relay
stops the motor. Outputs 95-96 open, causing the
control current to the contactor to be disconnected.
At the same time, the signal relay, terminals 97-98,
is closed. See fig. 6, pos. 6 and 7.
The limit values should not be changed unless the
pump has stopped.
The trip limits must be set in accordance with the
motor manufacturer’s specifications.
The warning limits should be set to a less critical
level than the trip limits.
If one or more of the warning limits are exceeded,
the motor continues to run, but the warnings will
appear in the MP 204 display, provided that this indi-
cation has been activated with the R100.
The warnings can also be read out with the R100.
9.3.1 Tempcon sensor
Set the warning and trip limits for the Tempcon sen-
sor.
Factory setting:
• Warning: 65 °C.
•Trip: 75 °C.
Note: Above limits are not active until the Tempcon
sensor has been activated. See section 9.4.8.
Note: The overvoltage and undervoltage trip limits
will be deactivated automatically if the temperature
monitoring with Tempcon has been set to active.
See section 9.4.8.
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