Moeller Rapid Link, Switching And Installation System, Page: 136 / 162

Speed controller RA-SP
01/08 AWB2190-1430GB
132
F-23 Electronic motor protection (E-THM)
In PNU b13, set the overload protection according to the
applicable motor load.
RA-SP can be configured to provide thermal monitoring of the
connected motor through an electronic bimetal tripping device.
With PNU b12, match the electronic motor protection to the
motor’s rated current. If the values entered here exceed the rated
motor current, the motor cannot be monitored with this function.
In this case, PTC thermistors or thermal contacts in the motor
windings must be used.
PNU Designation Adjustable in
RUN mode Value Function FS
b01 Restart mode – 00 = ALM The above fault messages are displayed when the associated fault occurs
(restart is not activated). 00
01 = ZST A restart at the starting frequency after the time set under PNU b03 has
elapsed.
02 = RST After the time set under PNU b03 has elapsed, the inverter synchronizes
to the current motor rotation speed and the motor accelerates for the set
acceleration time.
03 = FTP After the time set under PNU b03 has elapsed, the inverter synchronizes
to the current motor rotation speed and the motor brakes for the set
deceleration time. A fault message is then displayed.
b02 Permissible
power failure
duration – 0,3 to 25 s Here, you set a time duration during which the undervoltage condition is
met without the corresponding fault message in PNU E 09 being initiated. 5
b03 Waiting time to
restart – 0.3 to 100 s Here, set a time which is to expire before an automatic restart is initiated
after a fault signal. 1,0
h Caution!
At low motor speeds, the output of the motor cooling fan
is diminished, which can cause the motor to overheat
despite motor protection, You should therefore provide
protection with PTC thermistors or thermal contacts.
PNU Designation Adjustable in
RUN mode Value Function FS
b12 Tripping current for
electronic motor
protection device –
a
table 19 on
page 87
Setting range of the tripping current as a multiple of the RA-
SP’s rated current, i.e. the range is given in amperes (A).
1)
b13 Characteristic for
electronic motor
protection device – The electronic thermal protection of the motor in the low speed range can be
increased to improve thermal monitoring of the motor at low frequencies.
I
: Output current
01
00 = SUB Enhanced motor protection
01 = CRT Constant motor protection
1) Rated operational current of RA-SP,
a
table 19 on page 87
60
80
100
5 20 50 100
00
01
I
[%]
f
[Hz]