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7 - PARAMETER DESCRIPTION
7.2.2 Controlling the S4 Program Sequencer
The Program Sequencer can be activated and controlled from either the keypad or the terminal strip. It
is NOT possible to control the sequencer through the serial link. The control method of the program
sequencer is determined by parameters DRV 04 (Drive Mode 1) and DRV 05 (Freq Mode 1). Setting the
input mode parameters also allows switching from Sequencer mode to normal keypad operation by way of
the loc/rem button.
Keypad Control (Activation) of the S4 Program Sequencer
When activating or controlling the S4 Program Sequencer from the keypad, pressing “FWD” commands
the drive to cycle through the programmed states of the sequencer one time only (one-shot operation).
One-shot operation will run the sequencer until state 9 is reached, or until any state that is not changed from
the default is reached.
Pressing the [LEFT] and [FWD] buttons simultaneously causes the programmed sequence to repeat until
the [STOP] key is pressed (continuous operation). In continuous mode, the sequencer runs until state 9 or
any state that is not changed from the default is reached; it then jumps back to state 1.
Terminal Control of the S4 Program Sequencer
When activating or controlling the S4 Program Sequencer from terminals, continuous and one-shot
operation is determined by whether the drive is wired for 2-wire or 3-wire control. If the terminal is set
up for 2-wire control, the sequencer operates in continuous mode (R/J terminal inactive). This will run
the sequencer until the Forward command is removed. If the terminal is set up for 3-wire control, the
sequencer runs one cycle when the FWD terminal is activated.
z NOTE: The “REV” terminal has no function in sequencer mode.
S4 Sequencer Dwell Functionality
The S4 sequencer has the capability to dwell, or pause, in a state and disregard any command to advance to
the next state. This can be done in two different ways, and both methods can be used at the same time.
If the sequencer is actively running and the [ENTER] key is pressed from the Operate screen of the S4
keypad, the sequencer will dwell in the current state( it will never advance to the next state). While the
sequencer is dwelling, a warning of “Seq Dwell” will ash on the Operate screen. To leave the dwell state,
press the [ENTER] key again from the Operate screen.
The sequencer Dwell mode can also be entered by programming a digital input to “Seq Dwell” The
sequencer will then dwell in the current state, for as long as the digital input is active.
S4 Sequencer Advance Functionality
The sequencer has the ability to allow the user to advance to the next state without satisfying the conditions
programmed to advance. To do this, program a digital input to “Seq Advance.” When a digital input
programmed to this option changes from inactive to active, a running sequencer will advance one state.
This feature is useful when debugging a sequence with long time intervals.
7.2.3 Sequencer State Conguration Overview
Each state of the program sequencer is dened by ve characteristics:
Direction in which the drive will operate •
Speed at which the drive will operate •
Ramp selection of the drive •
Output conguration (relays and digital outputs) of the drive •
How the sequencer advances to the next state•
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