Section 5.0 Installation Guidelines
HGA IOM
29
Connection Diagram
The figure below shows the typical wiring connections between the models of the HGA and the
load. Refer to the drawings furnished with the unit for more specific information.
Connection diagrams in this section are representative. For the latest connection diagram,
please see the TCI website for the 25027-1 208-480 V connection diagram, the 28425 600 V
connection diagram, and the HMI and network connection diagram 28283-1.
•
The input 3-phase AC Voltage source must be connected in a positive ABC phase rotation
from
L1-L2-L3 for correct unit operation.
Figure 8: Load Connection Diagram
Notes:
1. Wiring should be 75° C or higher insulated copper, with the appropriate Voltage and current rating.
2. Chassis ground must be connected to the ground of the premises wiring system, in accordance
with NEC and local codes. Connection must be made using a wire conductor.
3. Terminal TB-I & J25 wire range is 30-12 AWG, tightening torque is 4.4 IN-LB (0.5 NM).
4. Operating current transformers with the secondary winding open can result in a high Voltage
across the secondary terminals, which may be dangerous to personnel or equipment.
Current Transformer Installation
For accurate sensing of the load, it is important that the load sensing current transformers are
properly installed.
Warning
All electrical installation and maintenance work on the HGA should be carried out by qualified
electricians only. Failure to follow standard safety procedures may result in death or serious injury.
Do not attempt any work on a powered HGA. Disconnect all sources of power to the HGA and any
connected equipment before working on the equipment. Check for zero Voltage between all phases
of the input and output lines.
Operating current transformers with the secondary winding open can result in a high
Voltage across the secondary terminals, which may be dangerous to personnel or
equipment.
It is necessary for the HGA to monitor the current in Phase “A” (L1) and Phase “C” (L3). Stand-
alone HGA filters are designed for Line Side current transformer (CT) placement as shown in
Figure 8. It is important that both CTs are on the same side of the HGA. The CTs should be
centered around the conductor. Optional Load Side CT placement is available for single units as
shown in