Parker 590+ DRV, Product Manual

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A-8
Serial Communications
DC590+ DRV Series DC Digital Drive
System Port (P3) Set-up
Set MODE parameter (Tag No. 130) to 5703 SLAVE or 5703 MASTER using the MMI
Set BAUD RATE parameter (Tag No. 198) to the required baud rate using the MMI. The baud rate must be the same on
both the transmitting and the receiving drives.
1 Stop bit (fixed)
NO Parity (fixed)
8 bits (fixed)
No flow control, (fixed)
Commissioning the 5703/1
Input to the Drive
The speed setpoint from the 5703/1 enters the drive via the P3 port and, after scaling, is presented to the application as the
parameter 5703 IN::SCALED INPUT. In the default application, this is added to analogue inputs 1, 2 and 3, (ramped), to
form the setpoint. 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.
Output from the Drive
By default, the value transmitted from the drive is the SPEED DEMAND parameter.