Siemens SIMOCODE pro System Manual page 34

System description
2)
Voltage monitoring
SIMOCODE pro V allows voltage monitoring of a three-phase current
network or a one-phase network for undervoltage or further availability:
• Monitoring for undervoltage:
Two-phase monitoring for freely-selectable limits. The SIMOCODE pro V
response can be freely parameterized upon reaching a particular pre-warning
or trip level.
• Monitoring for further availability:
Even when the motor is switched off, SIMOCODE pro can display the further
availability of the feeder by measuring the voltage directly at the circuit
breaker or fuses.
Temperature monitoring
The SIMOCODE pro V temperature module allows analog temperature
monitoring of, for example, the motor windings or the bearings of up to 3
sensor measuring circuits.
SIMOCODE pro V supports two-phase monitoring of overtemperature for
freely-selectable limits. The response of SIMOCODE pro on reaching a pre-
warning level or trip level can be freely parameterized and delayed.
Temperature monitoring takes into account the highest temperature of all
the sensor measuring circuits in use.
Active power monitoring
The active power curve of a motor reflects its actual load. Excess load
results in increased wear of the motor and, thus, may lead to premature
motor failure. Insufficient active power can, for example, be a sign of non-
load motor operation.
SIMOCODE pro V allows two-phase active power monitoring for freely-
selectable upper and lower limits. The SIMOCODE pro V response can be
freely parameterized and delayed upon reaching a pre-warning or trip level.
2)
Cos phi monitoring
The power factor fluctuates more than either the motor current or the active
power does, particularly in the low-end performance area of a motor.
Therefore, power factor monitoring is particularly suitable for distinguishing
between non-load operation and faults, e.g. a broken drive belt or drive
shaft.
SIMOCODE pro V enables two-phase monitoring of cos phi undershooting
for freely-selectable limits. The SIMOCODE pro V response can be freely
parameterized and delayed upon reaching a pre-warning or trip level.
Monitoring operating hours, motor stop time and number of starts
In order to avoid plant downtimes due to failed motors that were either
running too long (wear) or stopped for too long, both SIMOCODE pro C and
SIMOCODE pro V can monitor operating hours and motor stop times.
For example, if an adjustable limit value is exceeded, a signal indicating that
the relevant motor requires maintenance or replacement can be generated.
After replacing the motor, the operating hours and motor stop times can be
reset.
In order to avoid excessive thermal strain and premature aging of a motor,
the number of motor starts in a selected time frame can be limited. The
limited number of possible starts can be indicated by pre-warnings.
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1) 3)
2)
SIMOCODE pro
GWA 4NEB 631 6050-22 DS 03