It is basically current sensing single phasing preventer which gives total protection to three phase ac electric motor. The basic principle of operation is of sensing negative sequence current components and it trips electric motor starter as soon as it exceeds the dangerous level. This model offers protections upto motor terminals & is undefective to the motor back e.m.f. it is available in two models namely mgr & mgr-c. Both models are bascially same with slight difference in features like under/over voltage protection and inverse time current charactersitic setting.
These models offer total protection against single phasing on supply side as well as motor side. Overloading (inversely time current characteristics) reverse supply, current unbalance & low/high voltage, auto /manual reset provision etc. Is provided. The enclosure is made from high impact polysterene moulded with nylon moulded connection strip. It is available upto 200 amps. Green led indicates spp healthy condition and red led indicates overloading condition. Both models offer single phasing protection even if motor is on no load. It weighs 750 grams approx. And it's overall dimensions are 140 x 100 x 95mm.
MGR/MEG-C, current sensing SPP offers single phasing, reverse phasing, low/high voltage and overload protection with slight different features of inverse trip time current characteristics.
MGR: Fixed inverse trip time current characteristic (2 sec. std) which is factory set.
MGR-C: Variable inverse trip time current characteristic (from 2 sec. to 10 sec)
MGR V, voltage and current sensing SPP offers single phasing, reverse phasing and overload protections with fixed price trip time current characteristic (2 sec. std) which is factor set.
Technical Specifications
System voltage:
415 V +/- 20%, 3 @, 50 Hz
Auxiliary supply:
415 /230/110 V AC, 50 Hz
Output contact rating:
1 C/O potential free, 6 A resistive at 230 V or 1 A at 415 V at 0.5 PF
Trip time delay
For single phasing and reverse phasing:
4 to 7 seconds
For overload:
As per inverse time current characteristics
MGR/MGR-V:
2 sec. std (which is factory set)
MGR-C:
2 sec to 10 sec (adjustable)
For MGR/MGR-C model
High voltage cut-off/cut in:
500V +/- 5V/470 +/- 5V
Low voltage cut-off/cut in:
320V +/- 5V/340 +/- 5V
Reset:
Auto/manual/remote by external push button
Power consumption:
3 VA
Recommended wiring:
1.0 sq. mm
H.V. Test:
2 KV AC, 50 Hz for 1 minute between mounting plate and any terminal
Humidity:
Up to 95% RH
Enclosure:
High impact polystyrene molded with nylon molded connection trip
Fail safe:
Relay is energized in healthy conditions and trips in faulty conditions
Life expectancy:
0.5 x 10 5 operations
Indication for MGR/MGR-C:
Power On, low volt, SPP faulty, high volt, overloads
MGR-V:
Current SPP healthy, voltage SPP faulty, overload
Dimension:
Overall:
140x100x95 mm
Mounting:
129 x 74 mm
CT Dimension
Inbuilt:
16 mm ID
Separate:
31 mm ID
Weight:
750 gms (approx)
Terminal Marking
1 & 2 - Relay contacts for annunciation (NC)
2 & 3 - Relay contacts for tripping the starter (NO)
5 & 6 - Aux supply as marked on unit
4,7,8,9 - Dummy terminals
10 & 11 - Link for manual reset
11 & 12 - External reset push button (manual)
Instructions
Dotted line shown go through the two PVC pipes internal to the MGR unit
Relay contacts shown for the unit in healthy conditions
If starter dose not hold, interchange R & B (phase go through cts.)
