PU1000/PU600 INSTALLATION MANUAL
10229-15.doc
Polyamp AB, Sweden
www.polyamp.com
Page
8 (10)
load. The maximum voltage compensation is 5% of
nominal output voltage.
Do not disconnect the negative power connection
from the converter to the load before the positive,
when the converter is running and external sense is
used. This might damage the converter and it is also
not advisable for Your own protection to make
adjustments in the installation with voltage applied.
1.
Remove the jumpers from the sense inputs at
the removable connector.
2.
Connect a twisted-pair (0.25mm
2
-1.5mm
2
)
between the sense terminals of the converter
and the load, see
Figure 4
. The sense leads and
the power cables shall be of approximately the
same length and drawn as close to each other as
possible
. Beware of correct polarity!
Figure 4. External sense.
Figure 5. Feature contact.
6.2 Internal sense
If external sense is not used, the jumpers shall be
connected between ”+SENSE” and ”+V” and
between ”-SENSE” and ”-V”, as they are at
delivery. The converter then regulates the voltage at
its output screw terminals.
7 Inhibit
The converter is shut-down if the inhibit input is
short-circuited by a relay or an electrical switch.
The current through the short-circuit is 20mA. Note
that there is no electrical isolation between the
inhibit and the output.
1.
Use a twisted-pair (0.25mm
2
-1.5mm
2
) with a
maximum length of 3.0m for connection of the
inhibit.
8 Output over voltage protection
All models are equipped with an internal output
over voltage protection circuit (OVP). It consists of
an additional voltage regulator operating in parallel
with the main regulator. The output voltage is
limited to approximately 15% above the nominal
output voltage. As long as the OVP circuit is active
the alarm relay is set to ”ALARM” state and the red
”REG NOT OK” LED is lit.
9 Inrush current limit
Models with input codes 110, 220, 440 and D are
equipped with ”inrush current limit” feature. The
input capacitors are charged through a resistor to
reduce the input current during start up. When the
converter starts this resistor is shunted by a
thyristor, which also acts as a series diode.
All models have a ”slow start” feature. To reduce
input current during start up the output capacitors
are charged ”slowly” (approximately 0.1s).
10 Isolation voltage test
Each converter has been isolation tested in factory
before delivery see
Table 2
.
Warning! An
isolation test shall only be performed by
personnel aware of the dangers and hazards of
the test.
Input
code
Isolation
In/out,
In/case
Output
voltage
Vd.c.
Isolation
out/case
24, 48,
72, A, B
2.0kVd.c. 24, 48
2.0kVd.c.
110, 220,
440,C, D
2.5kVa.c. 24, 48
2.0kVd.c.
Table 2. Isolation voltages on different
converters.
10.1 DC isolation test output to case
1.
Disconnect all cables from the converter.
2.
Connect the input terminals of the converter to
case.
3.
Connect the output terminals together.
4.
Connect your isolation tester between output
and case. See
Figure 6
. Raise the voltage of the
isolation tester from 0 to 2000Vd.c. Check that
