Rockwell Automation 1901 SyncPro - Manual (Page 8)

1-4 Product Description
1901-UM020C-EN-P – June 2013
Protection Features (cont.) When the maximum programmed percentage of synchronous speed
(set point) is obtained, the field coil is energized on the falling
pulse of the negative square wave (i.e. a rising sinusoid) from the
slip frequency generator. A fixed time period after synchronization,
the autoload signal is raised. The field coil is energized only if the
TRANSITION COMPLETE has been received.
• Squirrel-Cage Winding Protection – Protects the squirrel-cage
winding from long acceleration and stall conditions during starting.
• Field Winding Application Control – The signal that triggers
application of the field excitation when the programmed
asynchronous speed is obtained.
• Incomplete Sequence Timing Relay – Trips the system if the
overall starting time is exceeded.
• Pull Out Protection – Monitors the power factor during running
to detect a loss of synchronism.
• Field Voltage Failure Relay Input – Monitors the condition of
the static exciter output. This relay must be supplied by the
customer if the SyncPro is not supplied as a configured unit within
a Rockwell Automation/Allen-Bradley motor controller.
Optional Equipment
• Field Current Failure Relay
• Load and Unload Auxiliary Contacts – The outputs are energized
2 sec. after the field is applied and is maintained until the field is
removed.
Display/Metering Features The product in conjunction with the Data Terminal Access Module
(DTAM) will perform the following metering/display functions:
• display all detected fault conditions
• display the slip frequency and starting time during startup
• display the power factor during run mode.
• accept set points through the DTAM for the following:
– maximum % asynchronous speed [% of synchronous speed]
– power factor set point and trip delay
– maximum allowable time at stalled state (maximum slip)
– maximum allowable time at 50% speed
– maximum allowable time at synchronizing speed (typically @
95% speed)
– function order (allows adjustment of the slope of the
acceleration/stall time trip curve).
– incomplete sequence timer trip delay
– fault mask for PF transducer diagnostics
(Refer to Chapter 5 for complete details.)