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User Instructions UM1M820BNA
Spec No. 1M820BNA (Model M820B) Issue AH, March 4, 2013
Spec No. 1M820DNA (Model M820D)
Chapter 2. Operation 79
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Systems, North America, Inc. Any copying, use, or disclosure of it without the written permission of Emerson Network Power, Energy Systems, North America, Inc. is strictly prohibited.
2.7.7 Verifying the Operation of the Power Split Feature
After programming the “Power Split” feature, verify its operation as follows.
a) In a Power Split application where the ACU+ power system is taking all of the load and the rectifiers
in the existing power system are all in the standby mode, use an external dry load bank of sufficient
capacity to increase the load on the ACU+ power system over the “SLAVE CURRENT LIMIT”
value.
1) Verify that the ACU+ power system limits the total output of its rectifiers to the current
equivalent to this programmed percentage.
2) Verify that the ACU+ power system lowers its output voltage by the value of the programmed
“DELTA VOLTAGE”.
3) Verify that the rectifiers in the existing power system take the additional load as the load
increases pass the “SLAVE CURRENT LIMIT” value.
4) Further increase the load in order to exceed the total capacity of the rectifiers in the existing
power system (or shut down some of the rectifiers in the existing power system if the capacity
of the external dry load bank is not sufficient). Verify that the ACU+ power system starts taking
the additional load as soon as the total capacity of the rectifiers in the existing power system is
exceeded.
b) In a Power Split application where the ACU+ power system is taking only part of the load (operating
continuously at the current level equivalent to the programmed “SLAVE CURRENT LIMIT”
percentage) and the rectifiers in the existing power system are taking the rest of the load, use an
external dry load bank of sufficient capacity to increase the load in order to exceed the total
capacity of the rectifiers in the existing power system (or shut down some of the rectifiers in the
existing power system if the capacity of the external dry load bank is not sufficient).
1) Verify that the ACU+ power system starts taking the additional load as soon as the total
capacity of the rectifiers in the existing power system is exceeded.