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參數(shù)資料
| 型號(hào)： | H471156415-50HZ |
| 文件頁(yè)數(shù)： | 2/3頁(yè) |
| 文件大?。?/td> | 68K |
| 代理商： | H471156415-50HZ |
2
Specifications are subject to change without notice (26.10.99)
H 471
Reaction time
τ
= 0.2 s, worst case reaction
time may be up to 5 x
τ
Adjustable delay on release
built-in (0.2 s - 10s)
Note
:
Reaction time + set time =
actual delay on release time
Accuracy
OFF delay
10 s, -1/+3 s on max.
< o.1 s on min.
Delay on release 0.2-10 s. adj.
Time function
Indication for
Power supply ON
Output ON
Environment
Degree of protection
Pollution degree
Operating temperature
Storage temperature
Weight
Approval
LED, green
LED, red
(IEC 60947-1)
IP 20 B/front IP 40 D (IEC 60529)
3 (IEC 60664)
-20° to +50°C (-4° to +122°F)
-50° to +85°C (-58° to +185°F)
300 g
CSA
Mode of Operation
Applications of asymmetry
I
: Mains monitoring:
Phase sequence.
Phase loss.
Phase amplitude asymme-
try.
II
:Load monitoring:
Phase sequence (direction
of motor rotation).
Fuse blowing.
Example 1
Mains network monitoring
The relay measures phase
loss, that the power supply has
correct phase sequence, that
all three phases are present,
and that the phase asymme-
try is within the preset level.
The knob-adjustable H 471
detects phase asymmetries
of 2 to 12% of phase-phase
amplitude.
The relay operates when all
three phases are present at
the same time and the phase
sequence is correct as well
as the measured asymmetry/
unbalance is below set point
(2 to 12% of phase asymme-
try). Phase angle failures are
registered as phase asymme-
try.
If the supply voltage drops to
approx. 25% of the phase-
phase voltage, the relay re-
leases without time delay.
Time/Range Setting
Range setting
Left potentiometer:
Phase asymmetry sensitivity
2 to 12% of phase-phase
amplitude. Adjustable on ab-
solute scale.
Time setting
Right potentiometer:
Time setting on relative scale.
Adjustable delay on release:
0.2 to 10 s.
Wiring Diagrams
Example 1
H 471
Example 2
H 471
μ
μ
L3
L2
L1
L3
L2
L1
General Specifications
regenerated phase depends
on the actual mechanical load
and motor size. In this case it
is a combination of phase
amplitude and phase angle
asymmetry higher than 2-3%.
Setting
Turn the asymmetry potentio-
meter counterclockwise (from
max.) until the relay releases.
Continue adjusting approx. 1
mark clockwise to ensure cor-
rect operation. At approx. 5%
or less asymmetry, ensure
that possible power supply
variations do not result in er-
roneous release.
Setting
The allowed asymmetry for
the mains voltage amplitudes
is set on the potentiometer.
Example 2
Load monitoring
The 3-phased monitoring re-
lay for electrical loads ensures
correct starting and operat-
ing conditions. The relay mo-
nitors phase sequence and
consequently the correct di-
rection of motor rotation.
The most frequent cause of
asymmetry and unbalance is
fuse blowing. In this case the
motor regenerates the inter-
rupted phase. The size of the
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