Electrical Connections - Indeeco 110-Z3 Operating Manual

ELECTRICAL CONNECTIONS

Again, this work must be performed by a qualified electrician and in
accordance with any and all local and national codes that may apply. Please refer to the wiring
diagrams (pgs. 10 - 18).
To reduce the risk of electrocution, TURN ALL POWER OFF to wires that will be
connected to the power control before making any connections. The 110-Z3 controller should be
installed in a metal enclosure for protection against electrocution. Remember, solid state devices
are never "off" unless you physically disconnect the incoming electrical power to the SCR.
1200 amp controller heat sinks are on line voltage!!
AC POWER INPUT:
Power input (AC MAINS) is connected to lugs labeled "LINE 1" and "LINE 2"(see figure 1 for correct wire size and
torque specs.) Line 3 is directly connected to third leg of heater load.
LOAD CONNECTION:
Load connections are equally simple; connect the load/ heater to lugs labeled "HTR 1" and "HTR 2" (see figure 1 for
correct wire size and torque specs).
NOTE: For open delta or 4 wire "wye" connected loads use INDEECO model 110-Z6, 3 phase, 3 leg, 6 SCR
control.
The 110-Z3 is capable of driving unbalanced loads, but it is highly recommended to equally BALANCE LOADS
BETWEEN ALL THREE PHASES (to provide consistent tracking between all three phases).
The I²T Semiconductor fuses that are built into the SCR do NOT qualify as branch
circuit protection. Separate branch circuit overcurrent protection is required. This overcurrent protection needs to be
provided in accordance with both national and local codes of the inspecting authority.
Check heater resistance to insure heater current will not exceed fuse ratings. Controllers DO NOT blow fuses -
excess heater current does. Check for heater wiring shorts, loose connections, shorted load connections which will
instantly blow expensive fuses.
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