Specifications

3.1.10.2 Electrical Wiring
MCB 114
Sensor Input Option B
SW. ver. xx.xx Code No. 130B1272
VDD I IN GND
TEMP
1
WIRE
1
GND
TEMP
2
WIRE
2
GND
TEMP
3
WIRE
3
GND
X48/
1 2 3 4 5 6 7 8 9 10 11 12
4-20mA
2 or 3
wire
2 or 3
wire
2 or 3
wire
2 or 3
wire
130BB326.10
Illustration 3.9 MCB 114
Terminal Name Function
1 VDD 24 V DC to supply 4-20
mA sensor
2 I in 4-20 mA input
3 GND Analog input GND
4, 7, 10 Temp 1, 2, 3 Temperature input
5, 8, 11 Wire 1, 2, 3
3
rd
wire input if 3 wire
sensors are used
6, 9, 12 GND Temp. input GND
Table 3.9 Legend to Illustration 3.9
3.1.11 D-frame Options
3.1.11.1 Load Share Terminals
Load share terminals enable the connection of the DC
circuits of several frequency converters. Load share
terminals are available in IP20 frequency converters and
extend out the top of the unit. A terminal cover, supplied
with the frequency converter, must be installed to
maintain the IP20 rating of the enclosure. Illustration 3.10
shows both the covered and uncovered terminals.
130BC547.10
Illustration 3.10 Load Share or Regeneration Terminal with
Cover (Left) and without Cover (Right)
3.1.11.2 Regeneration Terminals
Regen (regeneration) terminals can be supplied for
applications that have a regenerative load. A regenerative
unit, supplied by a third party, connects to the regen
terminals so that power can be sent back onto the mains,
resulting in energy savings. Regen terminals are available
in IP20 frequency converters and extend out the top of the
unit. A terminal cover, supplied with the frequency
converter, must be installed to maintain the IP20 rating of
the enclosure. Illustration 3.10 shows both the covered and
uncovered terminals.
3.1.11.3 Anti-Condensation Heater
An anti-condensation heater can be installed inside the
frequency converter to prevent condensation from forming
inside the enclosure when the unit is turned off. The
heater is controlled by customer-supplied 230 V AC. For
best results, operate the heater only when the unit is not
running.
A 2.5 amp time-delay fuse, such as the Bussmann
LPJ-21/2SP, is recommended to protect the heater.
3.1.11.4 Brake Chopper
A brake chopper can be supplied for applications that
have a regenerative load. The brake chopper connects to a
brake resistor, which consumes the braking energy and
prevents an overvoltage fault on the DC bus. The brake
chopper is automatically activated when the DC bus
voltage exceeds a specified level, depending on the
nominal voltage of the frequency converter.
3.1.11.5 Mains Shield
The mains shield is a Lexan cover installed inside the
enclosure to provide protection according to VBG-4
accident-prevention requirements.
3.1.11.6 Ruggedized Printed Circuit Boards
Ruggedized boards are available for marine and other
applications that experience higher than average vibration.
NOTICE
Ruggedized boards are required to meet
marine approval requirements.
Selection VLT® HVAC Drive FC 102 Design Guide
MG16C102 - Rev. 2013-08-20 57
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