Thytronic XMR-V 4V User Manual

FUNCTION CHARACTERISTICS
241
— Maximum number of starts - 66
Preface
The element performs a complementary task with respect to the thermal function: it prevents the
motor restarting when the conditions established by the motor manufacturer may be exceeded.
Two different operating modes may be select:
• Maximum number of starts performed inside an adjustable time control window,
• Maximum starting span (determined by the I> locked rotor threshold overcome) inside an adju-
stable time control window.
The trip of this protection should inhibit the starting of the motor.
The time control window is continuously shifted (step 10 s) to make the protection keeping a con-
stantly updated condition.
Operation and settings
The maximum number of starts performed inside an adjustable time control window or the maximum
starting span is compared with the setting thresholds. if Values above the associated threshold is
detected a trip is issued. The element it is restored after expiry of the associated inhibition time when
counters drop below the threshold.
The element can be enabled or disabled by setting ON or OFF the
66Enableparameter inside the
Set \ Profile A (or B) \ Maximum number of starts - 66 menu.
The element operating mode:
• Maximum number of starts performed inside an adjustable time control window,
• Maximum starting span (determined by the I> locked rotor threshold overcome) inside an adju-
stable time control window,
may be programmed by setting the Type66 parameter (
NTS,TST) and available inside the Set \
Profile A (or B) \ Maximum number of starts - 66 menu.
With NST-mode the motor starts are recognized by the relay when the fixed threshold IRUN = 0.10 IB
is overcome, while in TST-mode the time intervals exceeding the lower of the two enabled thresholds
50S/51LR (48) are added cumulatively.
With TST-mode are then incorporated not only the time intervals to the motor start but also time
intervals in which the motor undergoes temporary overloads beyond the locked rotor protection
threshold. With TST-mode at least one threshold should therefore enabled.
The thresholds:
• Maximum number of starts (NTS),
• Maximum real-time of starts (TST),
• Time control window (tC),
• Inhibition time (tIN),
can be adjusted inside the same menu.
Logical block (Block1)
If the 66BLK1 enabling parameter is set to ON and a binary input is designed for logical block
(Block1), the element is blocked off whenever the given input is active.
1
The enabling parameters are
available inside the Set \ Profile A (or B) \ Maximum number of starts - 66 menu, while the Block1
function must be assigned to the selected binary input inside the Set \ Board 1(2) inputs \ Binary input
IN1-1...(IN1-x) menus.
Timers-F66.ai
Maximum number of starts (66) - Inhibition timer
66 Trip
Threshold
TYPE66
INPUT
(NTS or TST)
t
IN
t
IN
t
IN
t
TST
NST
XMR-D EQUIPMENT MANUAL
Ed. 2.9 - 02/2021

Thytronic XMR-V 4V Specifications

General

Brand	Thytronic
Model	XMR-V 4V
Category	Protection Device
Language	English