Grounding - Danfoss VLT 2800 Quick Manual

Electrical Installation
No. Function
01-03 Relay outputs 01-03 can be used for indicating status
and alarms/warnings.
12 24 V DC voltage supply.
18-33 Digital inputs.
20, 55 Common frame for input and output terminals.
42 Analog output for displaying frequency, reference,
current or torque.
4 4
Digital output for displaying status, warnings or alarms,
46 1)
as well as frequency output.
50 +10 V DC supply voltage for potentiometer or thermistor.
53 Analogue voltage input 0-10 V DC.
60 Analogue current input 0/4-20 mA.
1) + 5 V DC supply voltage to Profibus.
67
68, RS-485, Serial communication.
1)
69
Frame for terminals 67, 68 and 69. Normally, this
70 1)
terminal is not to be used.
Table 4.4 Control Signals
1) The terminals are not valid for DeviceNet. See the DeviceNet
manual for further details.
See parameter 323 Relay output for programming of relay
output.
No. 01-02 1-2 make (NO - Normally Open)
01-03 1-3 break (NC - Normally Closed)
Table 4.5 Relay Contacts
NOTICE
The cable jacket for the relay must cover the first row of
control card terminals - otherwise the galvanic isolation
(PELV) cannot be maintained. Max. cable diameter: 4
mm.
14
Quick Guide

4.9 Grounding

Comply with the following at installation:
Connect all grounding systems to ensure the lowest
possible conductor impedance. The lowest possible
conductor impedance is achieved by keeping the
conductor as short as possible and by grounding with the
greatest possible surface area. If multiple frequency
converters are installed in a cabinet, use the metal cabinet
backplate as a joint ground reference plate. Fit the
frequency converters to the backplate at the lowest
possible impedance.
To achieve low impedance, connect the frequency
converter to the backplate with the frequency converter
fastening bolts. The backplate must be free from paint.
Danfoss A/S © Rev. 2014-03-18 All rights reserved.
•
Safety grouding: The frequency converter has a
high leakage current and must be grounded
properly for safety. Follow all local safety
regulations.
•
High frequency grounding: Keep grounding
connections as short as possible.
MG28M202