ABB 511 Series - Page 19

IB
-
7.2
.
1.7
-
1
PAGE
19
SOLID
-
STATE
OVERCURRENT
RELAYS
4
.
CALIBRATION
TESTS
(
Also
see
Appendix
A
)
Connect
the
CIRCUIT
-
SHIELD
relay
to
the
test
source
,
proper
DC
control
voltage
(
to
match
relay
)
,
and
synchronous
timer
as
shown
in
Figure
4
.
Also
,
set
pickup
tap
to
desired
value
.
TIME
—
Pickup
1
)
Set
TIME
dial
to
required
value
.
2
)
With
DC
source
off
,
preset
test current
to
95
%
of
pickup
value
.
3
)
With
DC
on
,
apply
test
current
.
No
trip
should
occur
.
4
)
With
DC
off
,
preset
test current to
105
%
of
pickup
value
.
5
)
With
DC
on
,
apply
testcurrent
.
The
relay
should
trip
and
operate
the
TIME
target
.
(
Allow
sufficient
time
)
6
)
Reset
target
by
pressing
the
RESET
pushbutton
.
TIME
—
Delay
Curve
1
)
Set INST
,
dial
to
maximum
position
(
20
X
)
.
2
)
Set
TIME
dial
to
required
value
,
per
time
-
current
curves
.
3
)
With
DC
off
,
preset
test current
to
300
%
of
pickup
value
.
4
)
With
DC
on
,
apply
test current
.
The
relay
should
trip
in
a
time
within
the
tolerances shown
on
page
4
.
5
)
Reset
target
by
pressing
the
RESET
pushbutton
.
INST
.
—
Pickup
1
)
Set
INST
,
dial
to
required
value
.
2
)
With
DC
off
,
preset
current to
90
%
of
required
value
(
TAP
X
INST
.
DIAL
)
.
3
)
With
DC
on
,
apply
testcurrent
.
Relay
should
nottrip
on
INST
.
(
i
.
e
.
no
INST
,
target
indication
)
.
4
)
With
DC off
,
preset
test
current to
110
%
of
required
value
.
5
)
With
DC
on
,
apply
test
current
.
Relay
should
trip
giving
INST
,
target
.
6
)
Reset
target
by pressing
the
RESET
pushbutton
.
R
=
RELAY
C
=
CLUTCH
M
=
MOTOR
DC
ON
/
OFF
SW
.
CIRCUIT
-
SHIELD
SW
I
ol
ARW
ol
<
7
^
0
lo
b
NOTE
:
If
a
rectifier
is
to
be
used
as
the
DC
source
for
testing
,
the
filter
capacitor
should
be
at
least
250
ufd
.
2
o
r
~
O
0
yRS
/
°
R
A
$
DC
SWJ
?
9
AiO
SOURCE
4
*
2
TIMER
AC
I
5
o
oil
~
)
I
20
VAC
J T E S T
SOURCE
6
o
I
2
"
IP
•
NOTE
:
FOR
3
-
PHASE
RELAYS
,
PHASES
A
&
C
CAN
BE
SIMILARLY
TESTED
BY
ALTERNATELY
CONNECTING
THE
TEST
SOURCE
T
01
—
2
and
5
—
6
.
+
rAR
[
AITI
I
b
-
Ll
0
|
i
®
i
|
®
(
p
(
M
?
II
5
II
59
O
-
T R
i
-
R
I
20
DC
AUX
.
RELAY
TYPE
HEA
6
I
OR
EOUIV
.
VAC
I
AC
2
NOTE
:
Auxiliary
relays
with
coil
resistances
greater
than
10
ohms
/
volt
must
have
a
parallel
resistor
added
across
the
relay
coil
.
Size
resistor
to
draw
100
ma
current
from
DC
source
Fig
.
4
—
Calibration
Test
Circuit
Courtesy of NationalSwitchgear.com