Specifications

MedWeld 3000 Catalog Revision 8
July 2002 Page 45 of 72
Medar MFDC System with Millisecond Interface
The millisecond interface is equipped with a 25-pin female D-Sub connector. The
table below defines the required pin-outs. The interface consists of three digital and
four analog inputs and the figure to the left illustrate the interface connections.
PIN # Description
1 IN 0
2 IN VCC
3 IN 1
4 IN VCC
5 IN 2
6 IN VCC
7 IN VCC
8 ANALOG VCC
9 ANALOG 0
10 ANALOG 1
11 ANALOG 2
12 ANALOG 3
13 N/C
14 (IN 0)
15 IN GND
16 (IN 1)
17 IN GND
18 (IN 2)
19 IN GND
20 IN GND
21 ANALOG GND
22 ANALOG GND
23 ANALOG GND
24 ANALOG GND
25 ANALOG GND
Please call WTC’s representative for assistance in configuring your requirements and
estimating costing.
The integrator supplies the voltage to operate the digital
inputs. The integrator can select whether the inputs are active
HIGH or active LOW. IN0 is connected to the anode side of
opto-coupler input while (IN0) is connected to the cathode
side.
To make the inputs active HIGH, connect the IN GND signal to
(IN0), (IN1) and (IN2). The IN0, IN1, and IN2 are connected
through switches to IN_VCC to provide the digital input. To
make the inputs active LOW, connect the IN_VCC to IN0, IN1,
and IN2 and apply switches between the IN GND and (IN0),
(IN1), and (IN2).
The nominal input voltage is 24Vdc - ranging from 10 to 28
Vdc. The maximum current draw of the inputs is 50 mA.
! IN0 / (IN0) is defined as WELD. When this signal is
active, the inverter will fire at the voltage / current setting
defined by the ANALOG 0.
! IN2 / (IN2) is defined as Constant Current Mode. If this
signal is inactive, the inverter will operate in Constant
Voltage Mode.
The millisecond interface card supplies the voltage for the
analog inputs via the lead ANALOG VCC. The reference poin
t
is compared to ANALOG GND input.