7SR210 & 7SR220 Commissioning & Maintenance Guide
© 2013 Siemens Protection Devices Limited
Page 23 of 82
Figure 2.4-2
Cold Load Logic diagram
Ensure that the
Cold load active
is not raised. This can be reset by CB closed for more than the Cold Load
Drop-
off Time
or current less than the
Reduced Current Level
for greater than the
Reduced Current Time
. Check the
Cold Load Pick-up Delay by applying or simulating CB Open. Measure the time delay before
Cold Load Active
is
raised. Apply current above the
Reduced Current Level
if this functionality is Enabled before applying CB Closed.
Measure the time for
Cold Load Active
to reset.
2.4.1 Inverse Time Overcurrent. (51C)
It will be advantageous to map the function being tested to temporarily drive the relevant Pickup output in the
Pickup Config
sub-menu in the
Output Config
menu as this will allow the Pick-up led to operate for the function.
Gradually increase current until Pickup LED operates.
Apply 2x setting current and record operating time.
Apply 5x setting current and record operating time.
Compare to calculated values for operating times
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