EPC
SERVO AMPLIFIER MODULE
Part Number L723888-3xx
ELECTRONIC
Telephone: (231) 929-1660
Oilgear
Fax:
(231) 929-7879
1424 International Dr
Issued May 31, 2018
Web Site:
www.oilgear.com
Traverse City, MI USA 4 9 6 8 6
Bulletin 836260F
53
5 Module Diagnostics
The EPC has diagnostics available through both the front of the EPC (LEDs and testpoint) and the PC
interface. However, due to the extensive features of the controller, the PC interface is the recommended
diagnostic tool.
5.1 Diagnostic Representation of Numbers
Throughout this manual, reference has been made to DAC counts, percentages, and voltages. DAC
count representation is the basis for all other diagnostic representation, since all internal numbers are
represented within the controller as DAC (Digital-to-Analog Converter) counts.
5.1.1 DAC Counts
Most Diagnostic numbers are stored as a 12-Bit number from 0 to 4095. For an input or output
variable, 0 DAC counts is equivalent to -10VDC while 4095 DAC counts is equivalent to +10VDC.
2048 DAC counts represents the midpoint of -10VDC and +10VDC, or 0VDC.
5.1.2 Voltage and Percentages
The PC interface allows a great range of diagnostic options. For most diagnostic Forms, the user can
select to view input and output values as voltages or percentages. This feature is particularly helpful
in LVDT adjustment.
A comparison summary of the different number representation follows:
Volts
:
-10V
-5V
0V
+5V
+10V
Percentage
:
-100%
-50%
0%
+50%
+100%
DAC
(decimal):
0000
1024
2048
3072
4095
5.2 Basic Diagnostics on Front Panel
On the front of the EPC are 3 bi-color LEDS. These indicate Run / Fault conditions,
Valve Current and Feedback. In addition, there is a testpoint labeled Analog Output 1.
See Figure 22 for the location of the LEDS and Testpoint.
Figure 22
