BECKWITH ELECTRIC M?3311A, Instruction Book

Page: 289 / 450

M‑3311A Instruction Book
6–10
6.3 Automatic Calibration
The M-3311A Transformer Protection Relay has
been fully calibrated at the factory. There is no need
to recalibrate the unit prior to installation. Further
calibration is only necessary if a component was
changed.
For units equipped with an optional M-3931 HMI:
8
WARNING: All relay functions and protection
will be inoperative while the relay is in
Diagnostic Mode.
1. Navigate to the
Auto Calibration
function in the
Diagnostic Mode
menu.
The following is displayed:
AUTO CALIBRATION
 com3 clock led CAL 
2. Press ENTER . The following is displayed:
CONNECT REFERENCE INPUTS
PRESS ENTER TO CALIBRATE
3. Connect voltage inputs in parallel to
terminal 36,64 (neutral) and terminal
37,65 (hot) and apply 120.00 (

0.01)
VAC
s
0°.
Hot
Neutral
37
36
Voltage
Input
120 V ac 0 o
V
2
V
1
65
64
Figure 6-7 Voltage Calibration Configuration
(4 Winding)
4. Connect all current inputs in series (
I
A
W
1
=
I
B
W
1
=
I
C
W
1
=
I
A
W
2
=
I
B
W
2
=
I
C
W
2
=
I
G
W
2
=
I
A
W
3
=
I
B
W
3
=
I
C
W
3
=
I
G
W
3
=
I
A
W
4
=
I
B
W
4
=
I
C
W
4
=
I
G
W
4
)
5. Apply 5.00 (

0.01) Amps
s
0°. For 1
Amp CT models, use 1.0 (

0.01) Amps
s
0°.
+
Current
Input
41
40
39
38
43
42
45
44
47
46
49
48
51
50
53
52
55
54
57
56
59
58
I
A
W
1
I
B
W
1
I
C
W
1
I
A
W
2
I
B
W
2
I
C
W
2
I
G2
W
2
I
A
W
3
I
B
W
3
I
C
W
3
I
G3
W
2
-
67
66
I
A
W
4
69
68
I
B
W
4
71
70
I
C
W
4
73
72
I
G
W
4
Figure 6-8 Current Calibration Configuration
(4 Winding)
6. Press
ENTER
to start calibration. While the
unit is calibrating, the display will show:
AUTO CALIBRATION
-WAIT-
7. When the calibration is complete, unit
will display:
AUTO CALIBRATION
-DONE-
8. The calibration can be verified by reading the
Status (see the
Monitor Status
menu, and
Monitor Status/Metering in Chapter 3).
For units without the optional M-3931 HMI:
It is possible to autocalibrate M-3311A units that
are not equipped with the optional M-3931 HMI. The
procedure is similar to HMI equipped units:
1. Remove power from the unit.
2. Place unit in calibrate mode by configuring
the proper dip switches (see Table 5-2).
3. Connect voltage inputs.
4. Connect all current inputs in series.
5. Apply power to the unit. The DIAG LED
will illuminate when operation is complete.
6. Remove power from the unit, then return
dip switches to
RUN
position.