64
SVERKER 750/760
Programma Electric AB
ZP-CD01E R05A
selected. The fault current is set in the usual way
with the main knob. The test is started by pressing
ON+TIME, whereupon the normal-operation
current changes to fault current and time measure-
ment starts. This procedure provides you with the
tripping times for the release/cut-out for a fault that
occurs occurring during normal operation and also
for a fault that prevents starting permission from
being granted.
7.6 Testing motor
overload releases and
overcurrent cut-outs
that grant/deny
starting permission
Only for SVERKER 750
Note! This connection will damage a
SVERKER 760.
Test equipment used for motor overload releases
and overcurrent cut-outs that govern the granting or
denial of starting permission must be able to provide
both normal-operation current and fault current, and
it must be possible to change between them without
interrupting the test. Moreover, time measurement
must start precisely when the change occurs.
The Sverker voltage source can supply the output
transformer via a reverse circuit comprising two
parallel-coupled resistors of 1000 Ω and 500 Ω. See
illustration above. The normal-operation current is
set from the voltage source, and it can be varied
from 0 up to 6 A, depending on the impedance of
the release/cut-out and the current output that was
To Next Page
Loading...
