PowerTec 1000 - DIGITAL MODE OPERATION; DIGITAL MODE NOTES

Page
20
Model
1000
Installation and Operation Manual
6/1/2001 © copyright 1997 by Powertec
PLC INTERFACE
The interface of the Models 1000 and 1000A with a process controller is dependent upon
the ability of the PC to handle the required signals.
Most of the signals are +24 VDC or 48 VDC (positive
and negative 24 VDC supplies for control), or +10 VDC
for speed. You may also use computer generated
frequency signals for speed in the DIGITAL mode.
There are two types of input modules.
A "sinking" connection uses the Programmable
Controller’s own power, or an external source (such as
the drive’s power as shown at left, and connects it (sinks
it) to common level by the connected input device. The
drawing on the left illustrates the method for using an
open collector output to "sink" the input of a +24 VDC PC
input module. When the transistor turns on, it turns on the
input module.
A “sourcing” connection turns on the PLC module by
supplying power to it. The second figure shows a sourcing
connection. Notice, however, the inverted sense, that is,
when the transistor turns on, the input is not.
You can use the fault output with connections similar
to those in the above figures. You can use a PLC input
module, with the FAULT output of the control at TB1
terminals 12 and 13, to sense a FAULT in the drive. The
bottom figure illustrates this.
You need to keep in mind that the FAULT isolated
output transistor is "ON" when there is no fault present in
the drive.
You should accomplish all of the programmable
controller operations of the standard control circuits of the
Models 1000 series controls with relays. These circuits
see 24VDC to ground, but they operate at 48VDC. RUN,
JOG, STOP, REVERSE, and EMERGENCY STOP inputs
operate on +24 VDC supplies. The circuitry, however,
actually operates between positive and negative supplies,
and it is difficult to make connections that do not involve
both power supplies.
17
12
16
+24VDC
TB2
ZERO
SPEED
+V
INPUT
COM
PLC
INPUT
MODULE
DRIVE
SINKING CONNECTION
SOURCING CONNECTION
17
12
16
+24VDC
TB2
ZERO
SPEED
+V
INPUT
COM
PLC
INPUT
MODULE
2Kohm
MIN
DRIVE
FAULT MONITOR
13
12
TB1
+V
INPUT
COM
PLC
INPUT
MODULE
FAULT