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 adjustable frequency drive’s
safe-stop circuit
•
LCD display of insulation resistance
•
Fault memory
•
INFO, TEST, and RESET keys
Brake chopper (IGBTs)
•
Brake terminals with an IGBT brake chopper
circuit allow for the connection of external brake
resistors. For more information on brake resistors,
refer to chapter 3.4.12 Brake Resistor Calculation
and .
Regeneration terminals
•
These terminals allow connection of regeneration
units to the DC bus on the capacitor bank side of
the DC link reactors for regenerative braking. The
F-frame regeneration terminals are sized for
approximately ½ the power rating of the
adjustable frequency drive. Consult the factory for
regeneration power limits based on the specic
adjustable frequency drive size and voltage
Load sharing terminals
•
These terminals connect to the DC bus on the
rectier side of the DC link reactor and allow for
the sharing of DC bus power among multiple
drives. The F-frame load sharing terminals are
sized for approximately 1/3 the power rating of
the adjustable frequency drive. Consult the
factory for load sharing limits based on the
specic adjustable frequency drive size and
voltage.
Fuses
•
Fuses are recommended for fast-acting current
overload protection of the adjustable frequency
drive. Fuse protection limits adjustable frequency
drive damage and minimizes service time in the
event of a failure. Fuses are required to meet
marine certication.
Disconnect
•
A door-mounted handle allows for the manual
operation of a power disconnect switch to enable
and disable power to the adjustable frequency
drive, increasing safety during servicing. The
disconnect is interlocked with the enclosure
doors to prevent them from being opened while
power is still applied.
Circuit breakers
•
A circuit breaker can be remotely tripped but
must be manually reset. Circuit breakers are
interlocked with the enclosure doors to prevent
them from being opened while power is still
applied. When a circuit breaker is ordered as an
option, fuses are also included for fast-acting
current overload protection of the adjustable
frequency drive.
Contactors
•
An electrically controlled contactor switch allows
for the remote enabling and disabling of power
to the adjustable frequency drive. If the IEC
emergency stop option is ordered, the Pilz Safety
monitors an auxiliary contact on the contactor.
Manual motor starters
Provide 3-phase power for electric cooling 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 and from the input
side of the Class 1 RFI lter (optional). Power is fused
before each motor starter, and is o when the incoming
power to the adjustable frequency drive is o. Up to two
starters are allowed (one if a 30-amp, fuse-protected circuit
is ordered). Integrated into the adjustable frequency drive’s
safe torque o circuit.
Unit features include:
•
Operation switch (on/o).
•
Short-circuit and overload protection with test
function.
•
Manual reset function.
30 Amp, fuse-protected terminals
•
3-phase power matching incoming AC line
voltage for powering auxiliary customer
equipment.
•
Not available if two manual motor starters are
selected.
•
Terminals are
o when the incoming power to
the adjustable frequency drive is o.
•
Power for the fused-protected terminals is
provided from the load side of any supplied
contactor, circuit breaker, or disconnect switch
and from the input side of the Class 1 RFI
lter
(optional).
24 V DC power supply
•
5 Amp, 120 W, 24 V DC.
•
Protected against output overcurrent, overload,
short circuits, and overtemperature.
System Integration
Design Guide
MG20N622 Danfoss A/S © 09/2014 All rights reserved. 69
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