Mvax; Electrical Operation Tests; Mvax 11 Only; Mvax 12 Only - GE MVAX 11 Technical Manual

Service Manual

MVAX

2.6 MVAX 21, 31, 91
For MVAX 21, 31 and 91 relays, check the external wiring to ensure the correct values of
external resistors (where appropriate) are wired to the correct relay terminals, in accordance
with the following table and the appropriate application diagram.
Supply volts
24/27
30/34
48/54
110/125
220/250
2.7

Electrical operation tests

2.7.1

MVAX 11 only

Isolate the MVAX from the trip supply batteries by removing fuses/links as necessary.
Connect a supply across relay terminals 21 – 27 and supply the relevant voltage from the list
below. Check that the current is within those figures stated in the same column. Repeat
again only using terminals 27 – 28.
Rated voltage range (V)
Test voltage (V)
Terminals 21 – 27
Terminals 27 – 28
2.7.2

MVAX 12 only

Isolate the relay from the trip supply batteries by removing fuses/links as necessary.
Using an ohmmeter check the resistance across the relay side of the fuses/links. Provided
there are no parallel paths, the resistance should be within ±10% of the following:
MVAX 12 rating range (V)
Relay resistance (Ohms):
No flag/hand reset flag
Relay resistance (Ohms):
No flag/hand reverse flag
Connect a variable dc supply to the isolated circuit ensuring correct polarity is observed
(Terminal 13 of the relay must be maintained POSITIVE).
Alarm supply circuit
R 1
EXT
-
–
240 ohm
1,500 ohm
*1,200 ohm
4,100 ohm
* S/R reverse flag
30/34 48/54
30 48
46.1/56.3mA 24.1/29.5mA
46.1/56.3mA 24.1/29.5mA
24/27
710 416
2
contacts
4
contacts
590 407
2
contacts
4
contacts
Trip supply circuit
R 2 and R 3, as appropriate
EXT EXT
270 ohm
470 ohm
1,500 ohm
4,000 ohm
2 off 4,000 ohm in series
110/125
110
11/13.4mA
11/13.4mA
30/34 48/54 110/125
1170 2970 10370
620 1760 7470
940 2330 8670
590 1740 6770
R8010RB
Page 7/24
120/250
220
11.4/14mA
11.4/14mA
220/250
33100
23100
27100
22100