Fuses; Branch Circuit Protection - Danfoss VLT HVACDrive Instruction Manual

Table of Contents

4 Electrical Installation

Terminal number

1+2+3

4+5+6

Table 4.2: Terminal connections

Very long control cables and analog signals may, in rare cases and depending on the installation, result in 50/60 Hz ground loops due to noise from line

power supply cables.

If this occurs, break the shield or insert a 100 nF capacitor between shield and chassis.

NOTE!

The common of digital / analog inputs and outputs should be connected to separate common terminals 20, 39, and 55. This will prevent

ground current interference among groups. For example, it prevents switching on digital inputs from disturbing analog inputs.

NOTE!

To comply with EMC emission specifications, shielded/armored cables are recommended. If an unshielded/unarmored cable is used,

see section

4.1.4 Fuses

Branch Circuit Protection

In order to protect the installation against electrical and fire hazard, all branch circuits in an installation, switch gear, machines, etc., must be short-circuit

and overcurrent protected according to the national/international regulations.

Short-circuit protection:

The adjustable frequency drive must be protected against short-circuit to avoid electrical or fire hazard. Danfoss recommends using

the fuses mentioned below to protect service personnel and equipment in case of an internal failure in the drive. The adjustable

frequency drive provides full short-circuit protection in case of a short-circuit on the motor output.

4-4

Terminal description

Terminal 1+2+3-Relay1

Terminal 4+5+6-Relay2

Terminal 12 Supply

Terminal 13 Supply

Terminal 18 Digital Input