Current-Based Load Control - Kohler MPAC 1500 Manual

5.10.2 Current-Based Load Control

Current-based load control allows the addition and
removal of loads based on the measured current
through the transfer switch. This feature requires an
optional current sensing
appropriately rated current transformers (CTs) and
wiring designed for your transfer switch.
Section 8.10, Current Sensing.
Current-based load control can be enabled for one or
both sources. The feature incorporates high and low
current setpoints for either source in amps. The user
can designate up to 9 outputs for current-based or
time-based load control.
Non-critical loads can be removed during periods of
high power usage. When the current exceeds a high
current limit, loads are removed in sequence according
to their priority settings until the current falls below the
high current limit. If the current level drops below the low
current limit, loads are added in order of their priority.
The add priority and remove priority settings are set
separately and can be different for the same load. Add
Priority #1 loads are added first. Remove Priority #1
loads are removed first.
Example: If you have four loads, with one load that
should be added first and removed last, set
Add Priority = 1 and Remove Priority = 4 for that load.
Prioritize the other loads according to the order in which
they should be added and removed.
Adjustable time delays prevent load addition and
removal caused by momentary current variations.
There are three time delays associated with each load.
See Figure 5-12 for time delays and other load control
parameters.
Current-Based Load Control Setup Procedure:
1. Connect each selected load to an output terminal
on the main logic board or one of the input/output
modules. The high power module accessory is
available for high voltage or high current loads.
2. Use the Set Inputs/Outputs screen to assign the
connected output to one of the load control outputs
1--9. See Section 5.12.
3. In the Set S1 or Set S2 Time Delays menu, select
Current as the load control mode.
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4. Enter the number of loads to control, which is equal
to the number of loads connected to outputs in
step 1.
5. Navigate to the Current-Based Control screen
under Set S1 Time Delays or Set S2 Time Delays to
set the following parameters for each connected
load.
a. Load Disc N>E (or E>N):
disconnect time delay before transfer to source
E (or Source N). See Figure 5-12. Save the
setting.
b. Load Ctrl # Source 1: Step through each load
connected to a load control output and set the
following parameters.
c. Load # Add Source1: Enter the time to wait
before the load is added.
nuisance changes caused by brief current dips.
See Figure 5-12.
d. Load # Add Source1 (Source2) Priority: Assign
a priority to each load. This number will be used
to determine the order in which loads are added
if the current drops below the low limit.
e. Load # Remove Src1 (Src2): Enter the time to
wait before the load is removed. This prevents
nuisance changes caused by brief current
spikes. See Figure 5-12.
f. Load # Remove Src1 (Src2) Priority: Assign a
priority to each load. This number will be used
to determine which loads are removed first if
the current rises above the high limit. (The
priority 1 load is removed first.)
g. Source1 Load Ctrl # Enable/Disable: Toggle to
Enable and press Save to enable load control
for the selected load.
6. Set Hi Current
Source1/Source2: Set the high current level. If the
current rises above this limit, loads will be removed
in order of their remove priority settings until the
current falls back to an acceptable level.
7. Set Lo Current Level, Load Add Source1/Source2:
Set the low current level. If the current drops below
this level and some loads are not connected, loads
will be added in the order of their add priority
settings. (The add priority and remove priority
settings for a load may be different.)
Set the load
This prevents
Level, Load Remove
Section 5 Setup 71