Parameterization
5-32 | SRW 01
5
All the protections listed can be enabled or disabled, and they can be configured to turn off the motor (Trip) or only
signal an alarm. For some protections, it is also possible to configure an adjustment time (delay).
The protections are active according to the motor state; some are transitory state, whereas others are continuous.
Some protections are active only when the motor is On (flowing current), when the motor is Off, or after the start
time.
SRW 01 provides protection and monitoring functions according to the motor states presented in
.
Table 5.13:
Availability of protection according to the motor state
Protection
Motor State
Overload
Motor on
Phase loss (current)
Motor on
Current unbalance
Always
Overcurrent (rotor locked)
Always
Undercurrent
Motor on
Ground fault
Always
Thermal protection via PTC
Motor on
Frequency out of range
Motor on
Leak to ground
Always
External fault
Configurable
Phase sequence
Always
Voltage unbalance
Motor on
Phase loss (voltage)
Motor stopped
Overvoltage
Motor stopped/after the start of the motor
Undervoltage
Motor stopped/after the start of the motor
Underpower
After the start of the motor
Overpower
After the start of the motor
Power under factor
After the start of the motor
Power over factor
After the start of the motor
NOTE!
The motor start time is given by the trip class of the relay (P640).
Example: Adjusting P640 = 2, we have the relay trip class = 10. Thus, the motor start time is 10 s.
5.7.1 Hysteresis
In order to improve stability and prevent oscillations, a hysteresis value is applied to the protections of overvoltage,
undervoltage, underpower, overpower, power under factor and power over factor.
The hysteresis value is subtracted from the maximum value for the protections of overvoltage, overpower and
power over factor. For the protection of undervoltage, underpower and power under factor, the hysteresis value is
added to the minimum adjustment value of the protection. Defining, thus, a value to start the counting and reset
the protection timer.
presents a diagram of hysteresis application.
Содержание SRW 01
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