ATI
Q46D-ODO Optical D.O. System
Part 4 – Electrical Installation
18
O&M Manual
Rev-J (8/17)
5. There is no standard ground resistance universally recognized. Many
agencies recommend a ground resistance value of 5 ohms or less.
The NEC recommends an impedance to ground of less than 25 ohms,
and less than 5 ohms where sensitive equipment is installed. Power
sources feeding sensitive instruments like the Q46 should have the
lowest possible impedance to ground
4.2
AC Powered Instrument Wiring
Verify the AC power supply requirement before installing. Also verify that power
is fully disconnected before attempting to wire.
Q46 systems are supplied with 5 cable gland fittings for sealing cable entries.
Connect HOT, NEUTRAL, and GROUND to the matching designations on
terminal strip
TB7
.
The analog outputs from the system are present at terminals TB1 and TB2. The
loop-load limitation in this configuration is 450 Ohms maximum for output 1 and
1000 ohms maximum for output 2. Also note that these two outputs are
completely isolated from each other to insure that ground loops do not result from
the connection of both outputs to the same device such as a PLC or DCS.
A ribbon cable connects the power supply assembly with the microprocessor
assembly located in the front section of the enclosure. This cable may be
unplugged from the front section of the monitor if service is needed, but should
normally be left in place during installation.
WARNING
Disconnect line power voltage BEFORE connecting
line power wires to Terminal TB5 of the power supply.
The power supply accepts only standard three-wire
single phase power. The power supply is configured
for 115 VAC or 230 VAC operation at the factory at
time of order, and the power supply is labeled as
such. Do NOT connect voltages other than the
labeled requirement to the input.
