12
power and signal wires accordingly, noting carefully all polarities.
Ensure that the unit is
properly grounded
to a suitable ground within the cabinet.
Identify the power connector on the rear panel in the top left corner. The power source
required is clearly marked, DC with the specific voltage level. (Refer to Figure 2.3).
Loosen the screws on the terminal block and insert the exposed conductor cable from the
power supply below the screws, under the metal plate. Ensure that the insulation is flush
with the terminal block. If it is too long, remove the cable, trim and reinsert. Tighten the
screw to firmly hold the cable. Ensure the ground wire is connected and properly
grounded at the other end. If you are not using the supplied wall power supply, follow the
same procedure carefully identifying the positive supply line. The unit is protected against
reverse polarity but not against substantial over voltage.
2.3.2 Input Signal Connections
The maximum input on any input channel is 25 Volts dc. Voltages
higher than this may permanently damage the unit.
Ensure the unit is unplugged before connecting any inputs.
There are two universal analog inputs – Channel A and Channel B,
each is programmed independently of the other. Inputs can be voltage
or current (50mA max using an external shunt), thermocouples, RTD’s or TTL compatible
pulse inputs. Isolation is between inputs and the rest of the system. The channels are not
isolated from each other. Connection detail for the various inputs is shown in Figure 2.4.
When connecting the signal wires, keep polarities correct. Also, if inputs are
non-
isolated
, ensure there are no high common mode voltages and maintain ground integrity.
Figure 2.4 – Connection Detail
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