Eriez E-Z TEC IV, Installation, Operation And Maintenance Instructions

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INTRODUCTION
All electrical connections are intended to be made
within the NEMA-4X power supply enclosure.
Figure 14 shows the enclosure and the electrical
connections to the power supply circuit board.
There are no user serviceable electronics or
electrical connections within the control
enclosure. Never attempt to remove the detector
control from the control enclosure.
CHOICE OF INPUT POWER SOURCE
The metal detector is equipped with filtering
devices to help eliminate incoming electrical
noise. Noise is usually created by inductive loads
sharing the same power circuit. Even with the
filters there is a limit to what the metal detector
can withstand without false tripping.
The best insurance against electrical noise is to
run a separate circuit from the main power bus.
This circuit should be free of all loads except the
metal detector. The power line should be run in its
own metal conduit. The conduit must be electrically
insulated from the conveyor. This includes any
supporting structure for the metal detector. If this is
impossible or impractical, reliable operation can
often be obtained by powering the metal detector
from a “clean” lighting circuit. This circuit must be
free of inductive loads such as motors, solenoids,
motor starters, variable frequency drives, etc.
If the metal detector must be powered by a less
favorable source, false tripping caused by line noise
can usually be eliminated through the use of a
harmonic neutralized constant voltage transformer.
POWER SUPPLY
Refer to Figure 14 for wiring to the power supply.
The metal detector may be powered at either of
two voltage ranges described in the specifications
section of this manual. Be certain the input power
voltage selection switch is in the proper position to
accept the power supply. The voltage selection
switch is shown in Figure 14 and is labeled SW2
on the circuit board.
Electrical Installation
CAUTION:
Be careful to distinguish between the input
voltage selection switch and the power (off/on)
switch. Both are located in the lower left corner
of the power supply circuit board. THE VOLTAGE
SELECTION SWITCH IS RED, AND IS LABELED
WITH THE AVAILABLE VOLTAGES, 115V AND
230V. THE POWER SUPPLY SWITCH IS BLACK,
AND IS LABELED WITH 0 AND 1, TO INDICATE
OFF AND ON, RESPECTIVELY. INADVERTENT
USE OF THE IMPROPER SWITCH COULD
LEAD TO CIRCUIT DAMAGE AND/OR
PERSONAL INJURY. See Figure 14 for the
location of these two switches.
The power source attaches to terminals L1 and
L2. If operating in the 115 VAC range, L1 is the
active or high side of the line and L2 is the neutral.
If operating in the 230 VAC range, connect either
supply line to L1 and the other to L2.
Note that L1 and L2 are connected through circuit
board traces to other terminals on the circuit
board as labeled. They are intended to be
conveniently available to the user to power
various ancillary equipment. They are not fused
on the circuit board. It is the user’s obligation to
be certain L1 and L2 lines are adequately fused
external to the metal detector, preferably at the
power source.
The power source must contain a reliable ground.
It must be connected to the “GND” terminal.
NOTE: The metal detector may be grounded at only
one point, through the power supply ground wire.
No other ground connections are permitted. This
includes mounting hardware and conduit.
The metal detector electronics are protected by
1A fuses (GMC-1A). The fuses are located
between the POWER SUPPLY L1 and L2
terminals and the metal detector electronics. Note
there are no fuses between the POWER SUPPLY
L1 and L2 terminals and the other L1 and L2
terminals on the circuit board.