82 • Motor and Soft Starter Protection
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8.4 Auto Reset
UNDER VOLTAGE and PHASE LOSS faults can auto-reset (refer to section
7.8.6 on page 71). The HRVS-
DN will reset itself 60 seconds after voltage was fully restored, provided that the START signal is removed.
UNDER CURRENT fault can be set to auto-reset (refer to section
7.8.6 on page 71).
The HRVS-DN will reset itself when a programmed time delay has elapsed even if the START signal is not
removed!
MOTOR INSULATION ALARM auto-resets if the resistance exceeds the INSULATION ALARM level (refer to
section
7.8.6 on page 71).
WARNING!
Auto Reset explained here above corresponds to the HRVS-DN IP00 unit
(OEM Kit). When the HRVS-DN is installed in a cabinet the behavior of the
Auto Reset depends on the cabinet wiring as well.
It is customer responsibility to avoid any dangerous conditions when the
HRVS-DN IP00 is installed in a medium voltage cabinet.
8.5 Timing Occurrence Table
Timing And Occurrence
Active During
Start Run Stop
Soft
Stop
Too many starts with START INHIBIT period
√
Coast Down Time with start (after stop) inhibit time
setting.
√
Electronic overload with curve selection
√
(1)
√
(1)
O/C shear pin (jam)
HRVS-DN protection – trip immediately at I≥850% FLC in less
than 1 cycle.
√ √
√
Motor protection – trip function
During start – factory set at 850% FLA after O/C DELAY.
√
√
During run – adjustable 100 – 850% FLA after O/C DELAY.
√
Under current adjustable time delay
√
Unbalance current adjustable time delay
√ √
√
Ground fault current adjustable time delay
√
Phase loss √ √
√
Phase sequence √
Under voltage with adjustable time delay. Time delay is
override in case of PHASE LOSS.
√ √
√
Over voltage with adjustable time delay
√ √
√
Long start time (stall protection)
√
Shorted SCR or Wrong Connection √
√
External fault 1 & 2– input from a N.O. contact
√ √ √ √
SCR protection by Metal Oxide Varistors (MOV)
√ √ √ √
HRVS-DN Power Section over-temperature √
√
HRVS-DN internal test, when the On LED is lit.
√ √ √ √
Motor insulation test (optional) – Two levels for alarm &
trip. When installed, operates when mains voltage is
removed.
√
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