Select Temperature Or Millivolt Input; Selecting 3 Wire Or 4 Wire Operation; Selecting 100 Ohm Or 120 Ohm Rtd Inputs - Control Technology CTI 2552-A Installation And Operation Manual

static bag. You will need it for the following configuration procedure.
2.4 Configuring the Module
The Model 2552-A must be configured for 100 Ohm platinum or 120 Ohm nickel RTDs (2, 3 or 4
wire) or millivolt range and digital filtering/no filtering mode before wiring the input connectors and
inserting the module into the I/O base.
Changing the module input channel configuration involves the following steps:
As shipped, all input channels are configured 100 Ohm platinum, 3 wire RTDs, degrees Celsius
and digital filtering enabled for temperature measurements.
1. Selecting temperature or millivolt measurement
2. Selecting 3 or 4 wire compensation
3. Selecting 100 Ohm platinum or 120 Ohm nickel RTD input mode for each channel
4. Selecting digital filtering or no filtering for the module
5. Logging the configuration jumper settings for future reference
Each of these steps is described in the following sections.

2.4.1 Select Temperature or Millivolt Input

Locate DIP switch SW2 (Temperature/Millivolt Switches in Figure 8) on the 2552-A card and for
each input 1-8 select either Temperature or Millivolt by turning each switch open or closed. The
"CLOSED" position corresponds to Temperature.

2.4.2 Selecting 3 Wire or 4 Wire Operation

Locate the 8 "3 wire/4 wire" jumpers corresponding to input channels 1 through 8. These jumpers are
located adjacent to the input terminal strip (see Figure 8). For each input channel, select 3 wire mode
by placing the jumper in the "3 wire" position or 4 wire mode by placing the jumper in the "4 wire"
position. If 2 wire operation is desired, use the "4 wire" position.

2.4.3 Selecting 100 Ohm or 120 Ohm RTD Inputs

Locate DIP switch SW1 (RTD Type Switches in Figure 8) on the 2552-A circuit card and select
either 100 or 120 type RTD for each of the eight inputs by turning each switch open or closed. The
"CLOSED" position corresponds to 100 Ohm platinum RTD input.
6
NOTE: FACTORY SHIPPING CONFIGURATION
CTI 2552-A Installation and Operation Guide