19
第
十
章
Chapter 6 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 PR5200(C) series soft starter
can be verified through the actual or simulation method. If it can't meet the user's requirements,
special protection device should be added to ensure safety.
6-2. Protection level setting description
6-2-1.
In order to adapt to different applications, PR5200(C) series soft starter has five
protection level, there are 0: Primary, 1: Light load, 2: Standard 3: Heavy, 4: Advanced, it setted by
PA setting. Among them,
(1)Primary protection is against to the function of external terminal instantaneous stop,
meanwhile only remains the overheating, short circuit and main circuit fault protection, it can be
applied to needed emergency start in unconditional occasion, such as fire systems, etc.
(2)The three protection level of light load, standard load and overload have the complete
protection function. The difference is the time curves of motor overloaded thermal protection are
not the same. The time parameters of motor thermal protection are as Table 6.1 and Figure 6.1.
(3)High level of protection standards is stringent at start. Other protection features parameters
keep the same with standard protection set.
6-2-2.
Protection level and thermal protection time according to PA setting is as the diagram
below:
Table 6.1
Содержание PR5200 Series
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