Serial Communications
14-5
590+ Series DC Digital Converter
Commissioning the 5703/1
The P3 port is configured for 5703 support using the MMI. The
Converter’s RS422 serial link will then allow control over the scaling
of the input by an operator station or by a host processor. Refer to
Chapter 15: “The Default Application” for the block diagram, and
also see Figure 14-2 Wiring Diagram for 5703/1 Speed Repeater
below.
Refer to Chapter 6: “Programming Your Application” - 5703
SUPPORT for parameter details.
The Inputs of the Drive
The speed setpoint from the 5703/1 enters the drive via the P3 port and, after scaling, is added
together with analog inputs 1, 2 and 3 (ramped).
IN BASIC TACHO-FOLLOWER MODE, ALL THE ANALOG INPUTS MUST BE
DISABLED TO PREVENT LOSS OF ACCURACY, yet it may be necessary in some
applications to provide analog inputs for trim signals or inch setpoints:
1. The ramp input may be disabled by taking terminal C7 (Ramp Hold) permanently high; the
ramp is automatically cleared when the drive is quenched, and its output will never move
from (exactly) zero. The ramp input may often be of use in line master drives; but the ramp
should be disabled in slave drives. Note that the P3 setpoint may be passed through the ramp
function; in such a case, the analog input to the ramp (terminal A4) is automatically
disconnected.
2. Analog input 1 (terminal A2) is used for inch setpoints. During normal running, the terminal
is shorted to 0V and the deadband function is used so that no signal at all passes to the
summing junction. The analog inch setpoints are set a little above the threshold of the
deadband so as to give the required inching speeds, forward or backward. Selection between
analog inching and absolutely zero analog input is thus accomplished automatically.
3. Analog input 2 (terminal A3) may be disabled by writing zero to its scaling block; this will
normally be done through the MMI at commissioning, but may be overridden by the serial
link. Alternatively, this input may be used for a local analog trim.
PSU
TX
RX
+24V dc
0V
POWER
FROM
RS232
BUFFER
TIL
RS232
TO DRIVE
INPUT
FIBRE OPTIC I/P
3
1
3 WAY JUMPER
2
FIBRE OPTIC O/P 2
FIBRE OPTIC O/P 1
OUTPUT
DRIVE
Figure 14-2 Wiring Diagram for 5703/1 Speed Repeater
MMI Menu Map
1
SERIAL LINKS
2
SYSTEM PORT P3
3
P3 SETUP
4
5703 SUPPORT
SETPT. RATIO
SETPT. SIGN
5703 INPUT
5703 OUTPUT