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Section Ⅵ Protection and description
PR5200(C) series soft starter with complete protection to protect the safety of soft
starter and motor. During the application, appropriate protection parameters and level
should be setted based on different situation.
6-1 Protection functions and their parameters
6-1-1. Soft starter over-temperature protection: the temperature rose to 80 ℃ ± 5 ℃
over-temperature protection, when the temperature dropped to 55 ℃ (the
lowest), no over-temperature protection。
6-1-2. Input phase protection lag time : <3 seconds。
6-1-3. Three-phase unbalance protection lag time: <3 seconds.
6-1-4. Three-phase unbalance protection lag time: <3 seconds.It is based on the
deviation of all phase current greater than 50% ± 10% . When the load current
is lower than 30% of the nominal rating of soft starter, the benchmark
deviation will increase.
6-1-5. start over current protection time: the duration is greater than the set P6 load
regulation rate for the benchmark 5 times the protection time see table 6.1.
6-1-6. Running overload protection time: to set the P6 load regulation rate as the
benchmark for anti time thermal protection, protective tripping time curve as
shown in Figure 6.1.
6-1-7. The protection lag time of much too low supply voltage, when the power
supply voltage is lower than the 40% of limit, the protection time <0.5
seconds, or the protection time <3 seconds if it is lower than the setting value.
6-1-8. The protection lag time of much too high supply voltage : when the power
supply voltage is lower than the 140% of limit, the protection time <0.5
seconds, or the protection time <3 seconds if it is higher than the setting
value.
6-1-9. The protection delay time of load short-circuit : <0.1 seconds, the current is
10 times more than soft starter nominal rated current. This protection can not
replace fuse short-circuit protection device.
6-1-10. Motor under load protection, the current range is 10% to 90% of motor rated
current, the protection action delay from 5 to 90 seconds。
These time parameters are from tested effective signal to a tripping protection
instructions, and the parameters just for reference. All the protection functions of
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