RCD (Residual Current Device)
Uses the core balance method to monitor ground fault currents in grounded and high-resistance grounded systems (TN and TT systems in IEC termi-
nology). There is a pre-warning (50% of main alarm setpoint) and a main alarm setpoint. Associated with each setpoint is an SPDT alarm relay for external
use. Requires an external “window-type” current transformer (supplied and installed by customer).
•
Integrated into the drive’s safe-stop circuit
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IEC 60755 Type B device monitors AC, pulsed DC, and pure DC ground fault currents
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LED bar graph indicator of the ground fault current level from 10–100% of the setpoint
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Fault memory
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TEST / RESET button
Insulation Resistance Monitor (IRM)
Monitors the insulation resistance in ungrounded systems (IT systems in IEC terminology) between the system phase conductors and ground. There is
an ohmic pre-warning and a main alarm setpoint for the insulation level. Associated with each setpoint is an SPDT alarm relay for external use. Note:
only one insulation resistance monitor can be connected to each ungrounded (IT) system.
•
Integrated into the drive’s safe-stop circuit
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LCD display of the ohmic value of the insulation resistance
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Fault Memory
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INFO, TEST, and RESET buttons
IEC Emergency Stop with Pilz Safety Relay
Includes a redundant 4-wire emergency stop pushbutton mounted on the front of the enclosure and a Pilz relay that monitors it in conjunction with the
drive’s safe stop circuit and the line power contactor located in the options cabinet.
Manual Motor Starters
Provide 3-phase power for electric blowers often required for larger motors. Power for the starters is provided from the load side of any supplied contactor,
circuit breaker, or disconnect switch. Power is fused before each motor starter, and is off when the incoming power to the drive is off. Up to two starters
are allowed (one if a 30 A, fuse-protected circuit is ordered). Integrated into the drive’s safe-stop circuit.
Unit features include:
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Operation switch (on/off)
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Short-circuit and overload protection with test function
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Manual reset function
30 Ampere, Fuse-protected Terminals
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3-phase power matching incoming AC line voltage for powering auxiliary customer equipment
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Not available if two manual motor starters are selected
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Terminals are off when the incoming power to the drive is off
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Power for the fused protected terminals will be provided from the load side of any supplied contactor, circuit breaker, or disconnect switch.
24 VDC Power Supply
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5 amp, 120 W, 24 VDC
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Protected against output overcurrent, overload, short circuits, and overtemperature
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For powering customer-supplied accessory devices such as sensors, PLC I/O, contactors, temperature probes, LEDs, and/or other electronic
hardware
•
Diagnostics include a dry DC-ok contact, a green DC-ok LED, and a red overload LED
FC 300 Design Guide
10 Options and Accessories
MG.33.BC.22 - VLT
®
is a registered Danfoss trademark
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