176 Rockwell Automation Publication PFLEX-RM003E-EN-E - January 2011
Chapter 1 Detailed Drive Operation
Start Inhibits
This section covers start inhibits, displayed in parameter 156 [Start Inhibits].
This parameter indicates the cause of no response to a start request.
Start and Stop Modes
Start and stop modes refers to how you want to control the drive's start and stop
functions. There are two basic modes of start and stop control: 3-wire and 2-wire.
3-wire control indicates that the start and stop are momentary inputs. 3-wire
control also indicates that there is one input for the start command, and one
input for the stop command. The term “3-wire” comes from the fact that when
using this type of control with digital inputs, one wire is used for the start input,
one wire is used for the stop input, and one wire is used for the common.
2-wire control indicates that the start and stop are combined as one maintained
input. The input must be on to start and to remain running. Then the same input
is turned off to stop. The term “2-wire” comes from the fact then when using this
type of control with digital inputs, one wire is used for the combined start and
stop input, and one wire is used for the common.
For the stop command, there are three different types of stopping that can be
performed: coast stop, ramp stop, and current limit stop.
1. Coast Stop - when in coast stop, the drive acknowledges the stop command
by shutting off the output transistors and releasing control of the motor.
The load/motor will coast or free spin until the mechanical energy is
dissipated.
Bit Name Description
0 Faulted The drive is faulted
1 No Enable No Enable is signal present
2 SW Ramp Stop A software ramp stop command is present
3 SW Coast Stp A software coast stop command is present
4 SW I Lim Stp A software current limit stop command is present
5 Power Loss A power loss has occurred
6 Power EE A power EEprom error has occurred
7 Flash Upgrd A Flash upgrade is in progress
8 Start A start command is present
9 Jog A Jog command is present
10 Encoder PPR A Encoder PPR error has occurred
11 Bus PreChrg Bus precharge has not completed
12 DigIn Config A digital input configuration error has occurred
13 Motin Shtdwn A motion shutdown has occurred
14 PM Mtr Fdbk A permanent magnet motor feedback error has occurred
15 PositFdbkSel A position feedback selection configuration error has occurred
16 GateShutdown SCR gating has shutdown
17 SafeOff Enbl A Safe-Off input is enabled
18 MC Config The drive is loading firmware for motor control
20 High BusVolt The bus voltage is too high
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