Electrical Wiring; D-Frame Options; Load Share Terminals; Regeneration Terminals - Danfoss VLT HVAC Drive FC 102 Design Manual

Selection

3.1.10.2 Electrical Wiring

3 3
MCB 114
Sensor Input
SW. ver. xx.xx
VDD
X48/ 1
4-20mA
2 or 3
wire
Figure 3.9 MCB 114
Terminal
1
2
3
4, 7, 10
5, 8, 11
6, 9, 12
Table 3.9 Legend to Figure 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 adjustable frequency drives. Load share
terminals are available in IP20 adjustable frequency drives
and extend out the top of the unit. A terminal cover,
supplied with the adjustable frequency drive, must be
installed to maintain the IP20 rating of the enclosure.
Figure 3.10 shows both the covered and uncovered
terminals.
66
Option B
Code No. 130B1272
I IN GND TEMP WIRE
GND TEMP WIRE GND TEMP
1 1 2 2 3
2 3 4 5 6 7 8 9 10 11 12
2 or 3
2 or 3 2 or 3
wire
wire
Name Function
VDD 24 V DC to supply 4–20
mA sensor
I in 4–20 mA input
GND Analog input GND
Temp 1, 2, 3 Temperature input
Wire 1, 2, 3 Third wire input if three
wire sensors are used
GND Temp. input GND
Danfoss A/S © Rev. 2014-01-13 All rights reserved.
Design Guide
WIRE GND
3
Figure 3.10 Load Share or Regeneration Terminal with Cover
(Left) and without Cover (Right)

3.1.11.2 Regeneration Terminals

wire
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 line power,
resulting in energy savings. Regen terminals are available
in IP20 adjustable frequency drives and extend out the top
of the unit. A terminal cover, supplied with the adjustable
frequency drive, must be installed to maintain the IP20
rating of the enclosure. Figure 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
adjustable frequency drive 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 adjustable frequency drive.

3.1.11.5 Line Power Shield

The line power shield is a Lexan cover installed inside the
enclosure to provide protection according to VBG-4
accident-prevention requirements.
MG16C122