Quadlogic MiniCloset-5c, Installation Manual

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Chapter 4 Installation
© COPYRIGHT 2009
Quadlogic Controls Corporation
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B) CT installation
i. Follow CT installation procedure on page 13.
ii. For each load, determine which voltage phase supplies the power. Then use a CT
with the corresponding color code for that load (Black, Red, or Blue).
iii. Route the load wire through the CT as shown in the diagram
iv. Connect the CT secondary wires to the MCI according to the following procedure:
v. Every CT MUST be connected to an MCI input which is referenced to the correct
phase (See Figure 4-6.)
vi. This type of meter is configured as a Residential 2-phase meter. For these
installations, the meter measures (12) 2-phase loads. Each metered load has 2 CTs.
The 2 CTs from a particular metered load must be connected to adjacent inputs as
shown in the chart. Note that meter 1 uses phases A and B, meter 2 uses phases C
and A, meter 3 uses phases B and C, and so on.
Installation Notes
CRITICAL:
The Phase Association and Polarity of the current transformers must be followed or meter will
not be installed correctly.
1. Current transformers must be in phase with Reference Voltage. The MCI runs in an A-B-
C phase rotation and each three CT connections repeat an A-B, C-A, and B-C order.
Figure 4-6. CT phase association for 1-phase, 3-wire 120/208V loads.
For example, current transformers installed in phase with A reference voltage must be installed on
CT1, CT4, CT7, etc. Current transformers installed in phase with B reference voltage must be
installed on CT2, CT5, CT8, etc. Current transformers installed in phase with C reference voltage
must be installed on CT3, CT6, CT9, etc.
2. Each A-B, C-A, and B-C combination is a single meter point (separated by yellow and
white in the above chart):
-
Meter #1 (M#1) is measuring CT1 and CT2
-
Meter #2 (M#2) is measuring CT3 and CT4
-
repeat for M#3 to M#12