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42 Installation
HP289
7. Installation
7.1 General
Terminal designations for the Model 214D Batch Controller are given
on the following pages. The cutout hole in the panel should be 5.5"
(139mm) wide x 2.6" (67mm) high. Two side clips are supplied to
secure the instrument into the panel.
A case grounding point is provided via a ground lug on the side of the
case. Note that this grounding point is for the case only and there is
complete electrical isolation between this point and all electronic
circuits. For EMC purposes or when the instrument is connected to AC
power source, this point must be connected to a good earth ground
using a multi-stranded, braided wire or strap.
The two control relays are changeover relays and both the “normally
open” and “normally closed” terminals are available on the rear
terminal strip. All relay outputs are totally isolated from the case and
from the internal circuitry.
A Supply Output Voltage is provided to power sensors. This output
will provide a regulated voltage of 8 to 24 volts and the voltage is
adjustable by means of the potentiometer on the rear panel. Maximum
current is 50mA and the instrument comes with the voltage factory set
at 24 Volts. When the instrument is powered from a DC power source,
the maximum output voltage on the Supply Output is the DC Input
Voltage less 3.5 volts.
The instrument will operate from either 12-28 volts DC or from the AC
line. The AC voltage is factory set to either 95 - 135 VAC (110 VAC
nominal) or 190 - 260 VAC (220 VAC nominal). An internal AC
transformer provides full isolation between the AC line and the
electronic circuits.
The DC Ground terminal 12 provides a common ground for the 12-28
Volt power input, the 8 - 24 Volt output, the pulse output, and the
End-of-Batch output.
It is good practice to use shielded cables for all signal connections to
the Model 214D. Care must be taken to separate signal cables from
power cables so as to minimize interference. Overall shields should be
connected to the case earth at the instrument end only. This connection