D-74 Programming
DC590+ Series DC Digital Drive
JOG/SLACK
This block can be used to provide jog, take up slack and crawl speed functions.
The inputs to this block are the Start and Jog signals via the SEQUENCING function block, and the
speed demand from the RAMPS function block. The output of this block is connected to the RAMPS
function block.
The JOG/SLACK parameters modify or replace the ramp input speed demand. You should use a spare
digital input to switch between modes to achieve full functionality.
The JOG/SLACK OUTPUT parameter is internally connected to the RAMPS function block. This
output is the modified value of the speed demand as required by MODE, Start, and Jog. These settings are shown in the Setpoint Selection table.
• Jog: With the Start signal OFF, the jog speed demand replaces the ramp input speed demand. MODE selects between jog setpoints 1 and 2. The
jog RAMP RATE replaces the RAMP ACCEL TIME and RAMP DECEL TIME in the RAMPS function block. % S-RAMP is also set to 0.00%.
• Take Up Slack: With the Start signal ON, the jog signal performs a "take up slack" function. When a jog signal is received, the take up slack
setpoint is added to the ramp input speed demand. MODE and Jog settings, from the table, select between the two take-up slack setpoints.
• Crawl: CRAWL SPEED replaces the ramp input speed demand as the output signal when both Start and Jog signals are ON, and MODE is TRUE.
JOG/SLACK
Selects jog speed setpoints, take up setpoints, and the crawl setpoint. To achieve full functionality, connect MODE to a spare digital input.
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