Danfoss VLT AQUA Drive FC 202 Design Manual page 58

Selection
alarm relay for external use. The RCD requires an external
"window-type" current transformer, which is supplied and
installed by the customer. Features include:
•
Integrated into the safe torque off circuit of the
frequency converter
3 3
•
IEC 60755 Type B device monitors AC, pulsed DC,
and pure DC ground fault currents
•
LED bar graph indicator of the ground fault
current level from 10–100% of the set-point
•
Fault memory
•
[Test/Reset] key
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 set-point for the insulation level. Each
set-point is associated with an SPDT alarm relay for
external use.
NOTICE
Only one insulation resistance monitor can be connected
to each ungrounded (IT) system.
Features include:
•
Integrated into the safe torque off circuit of the
frequency converter
•
LCD display of the ohmic value of the insulation
resistance
•
Fault Memory
•
[Info], [Test] and [Reset] keys
IEC emergency stop with Pilz safety relay
Includes a redundant four-wire emergency-stop push
button mounted on the front of the enclosure. A Pilz relay
monitors it with the safe torque off circuit and the mains
contactor located in the options cabinet.
Safe Stop with Pilz Relay
Provides a solution for the "Emergency Stop" option
without the contactor in F-Frame frequency converters.
Manual motor starters
Provides 3-phase power for electric blowers that are 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 frequency converter is off. If a 30 A fuse-protected
circuit is ordered, only one starter is allowed, otherwise 2
starters may be selected. The starter is integrated into the
safe torque off circuit.
Unit features include:
56
Design Guide
30 A, fuse-protected terminals
24 V DC power supply
External temperature monitoring
Monitors temperatures of external system components
such as the motor windings and/or bearings. This option
includes 5 universal input modules. The modules are
integrated into the safe torque off circuit and can be
monitored via a fieldbus network. This requires the
purchase of the safe torque off option and separate
module/bus couplers.
Universal Inputs (5)
Signal types:
Additional features:
Danfoss A/S © Rev. 06/2014 All rights reserved.
•
Operation switch (on/off)
•
Short-circuit and overload protection with test
function
•
Manual reset function
•
3-phase power matching incoming mains voltage
for powering auxiliary customer equipment
•
Not available if 2 manual motor starters are
selected
•
Terminals are off when the incoming power to
the frequency converter is off
•
Power for the fused protected terminals is
provided from the load side of any supplied
contactor, circuit breaker, or disconnect switch.
•
5 A, 120 W, 24 V DC
•
Protected against output over-current, overload,
short circuits, and over-temperature
•
For powering customer-supplied accessory
devices such as sensors, PLC I/O, contactors,
temperature probes, indicator lights, and/or other
electronic hardware
•
Diagnostics include a dry DC-ok contact, a green
DC-ok LED, and a red overload LED
•
RTD inputs (including PT100), 3-wire or 4-wire
•
Thermocouple
•
Analog current or analog voltage
•
One universal output, configurable for analog
voltage or analog current
•
Two output relays (N.O.)
•
Dual-line LC display and LED diagnostics
•
Sensor lead wire break, short-circuit, and incorrect
polarity detection
•
Interface setup software
MG20Z202