PAGE / 6
Doc. P/N 06-905
Rev. 1 / December 2018
7.2.
Interpreting EPC Measured Results
Once you’ve used the Analyzer to test the activation current supplied by an EPC, the Analyzer will display the results
on the front panel as either EPC PASSES or REPLACE EPC.
When the Analyzer is used to test the supervisory current supplied by the EPC, it will display the supervisory current
reading in milliamps. The acceptable supervisory current reading at the EPC or field device is 3 - 10 mA.
7.3.
EPC Testing Procedures
If an EPC is configured with “AND”ed detectors, you will need to test the firing current by activating both 4-20 mA
detection inputs (P2-1 and P2-2) using standard service procedures. If optical detectors are connected to the EPC’s
contact closure detection input (P3), you will need to test the firing circuit by activating the detection input using
standard service procedures, rather than using the Activate button.
NOTE: The upper limit of each test range is provided to help you determine when a component is nearing the end of
its useful life and should be replaced. For the EPC, the average of the four test readings must be greater than or equal
to 95% of 3 amps, or 2.85A. If the average is approaching 2.85A, consider replacing the EPC.
7.3.1.
Test 1: EPC Series Firing Circuit Activation Current Test
This Output Analyzer test verifies the acceptability of the activation current supplied by the EPC’s series firing circuit.
The Analyzer comes with several jumpers and test leads that are used to perform these tests. To get started:
Power down the EPC.
Disconnect the detection input circuit terminal blocks (P2-1 and P2-2) from the EPC.
Disconnect and shunt the series firing circuit terminal block (P3-2) from the EPC.
Use the EPC Test Harness supplied with the Analyzer to connect it to the EPC’s 4-20 mA detection circuits (P2-
1 or P2-2) and series firing circuit (P3-2), as shown in Figure 7.3.1-1 below.
Connect the 0Ω shunt to the Analyzer
jumper port, as shown in Figure 7.3.1-1.
Connect the EPC harness to the EPC Analyzer.
Figure 7.3.1-1 EPC Series Firing Circuit
Activation Current
Fire
(EPC Only)
EPC P3
GCA Output
EPC P2-1 or P2-2
4
–
20 mA
EPC Analyzer
EPC Test Harness
10
Resistor
Shunt
2-Position Plug
75
Resistor
Select
Enter
Fire
(EPC Only)
