Terminal number Terminal description Parameter number Factory default
1+2+3 Terminal 1+2+3-Relay1 5-40 Alarm Running
4+5+6 Terminal 4+5+6-Relay2 5-40 Alarm Running
12 Terminal 12 Supply - +24 V DC
13 Terminal 13 Supply - +24 V DC
18 Terminal 18 Digital Input 5-10 Start
19 Terminal 19 Digital Input 5-11 Reversing
20 Terminal 20 - Common
27 Terminal 27 Digital Input/Output 5-12/5-30 Coast inverse
29 Terminal 29 Digital Input/Output 5-13/5-31 Jog
32 Terminal 32 Digital Input 5-14 No operation
33 Terminal 33 Digital Input 5-15 No operation
37 Terminal 37 Digital Input - Safe Stop
42 Terminal 42 Analog Output 6-50 Speed 0-HighLim
53 Terminal 53 Analog Input 3-15/6-1*/20-0* Reference
54 Terminal 54 Analog Input 3-15/6-2*/20-0* Feedback
Table 5.8 Terminal Connections
Very long control cables and analog signals may, in rare
cases and depending on installation, result in 50/60 Hz
earth loops due to noise from mains supply cables.
If this occurs, break the screen or insert a 100 nF capacitor
between screen and chassis.
NOTE
The common of digital/analog inputs and outputs should
be connected to separate common terminals 20, 39 and
55. This will avoid ground current interference among
groups. For example, it avoids switching on digital inputs
disturbing analog inputs.
NOTE
Control cables must be screened/armoured.
5.2.3 Motor Cables
See 8.1 General Specifications for maximum dimensioning
of motor cable cross-section and length.
•
Use a screened/armoured motor cable to comply
with EMC emission specifications.
•
Keep the motor cable as short as possible to
reduce the noise level and leakage currents.
•
Connect the motor cable screen to both the de-
coupling plate of the frequency converter and to
the metal cabinet of the motor.
•
Make the screen connections with the largest
possible surface area (cable clamp). This is done
by using the supplied installation devices in the
frequency converter.
•
Avoid mounting with twisted screen ends
(pigtails), which will spoil high frequency
screening effects.
•
If it is necessary to split the screen to install a
motor isolator or motor relay, the screen must be
continued with the lowest possible HF
impedance.
Requirements
5.2.4 Electrical Installation of Motor Cables
Screening of cables
Avoid installation with twisted screen ends (pigtails). They
spoil the screening effect at higher frequencies.
If it is necessary to break the screen to install a motor
isolator or motor contactor, the screen must be continued
at the lowest possible HF impedance.
Cable length and cross-section
The frequency converter has been tested with a given
length of cable and a given cross-section of that cable. If
the cross-section is increased, the cable capacitance - and
thus the leakage current - may increase, and the cable
length must be reduced correspondingly.
Switching frequency
When frequency converters are used together with Sine-
wave filters to reduce the acoustic noise from a motor, the
switching frequency must be set according to the Sine-
wave filter instruction in 14-01 Switching Frequency.
Aluminium conductors
Aluminium conductors are not recommended. Terminals
can accept aluminium conductors but the conductor
surface has to be clean and the oxidation must be
removed and sealed by neutral acid free Vaseline grease
before the conductor is connected.
How to Install
VLT
®
Refrigeration Drive Design Guide
64 MG16G102 - VLT
®
is a registered Danfoss trademark
5
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