Control Wiring - Danfoss vlt fcd 302 Operating Instructions Manual

Installation
C C AUTION
WIRING ISOLATION
Run input power, motor wiring and control wiring in three
separate metallic conduits or use separated shielded motor
and control cables for high frequency noise isolation. Failure
to isolate power, motor and control wiring could result in
less than optimum frequency converter and associated
equipment performance.
MOTOR PROTECTION
Protection against motor overload is not included in the
factory setting. If this function is desired, set 1-90 Motor
Thermal Protection to data value ETR trip 1 [4] or data value
ETR warning 1 [3].
•
Connect the motor to terminals 96, 97, 98.
•
Connect earth to PE-terminal.
•
Make sure the screen of the motor cable is properly
earthed at both ends (motor and frequency
converter).
•
For correct dimensioning of cable cross-section see
section 8.1.1 Electrical Data and Wire Sizes.
No.
96 97 98 Motor voltage 0-100 % of mains voltage
U V W 3 wires out of motor
U1 V1 W1
W2 U2 V2
U1 V1 W1 6 wires out of motor, Star connected
U2, V2, W2 to be interconnected separately (optional
terminal block)
PE Earth connection
NOTE
Do not install power factor correction capacitors between
the frequency converter and the motor.
Do not wire a starting or pole-changing device between the
frequency converter and the motor.
Parallel connection of motors
The frequency converter can control several parallel-
connected motors. The total current consumption of the
motors must not exceed the rated output current I
frequency converter.
NOTE
•
Installations with cables connected in a common
joint as in Illustration 2.8, is only recommended for
short cable lengths (max. 10m).
•
When motors are connected in parallel,
1-29 Automatic Motor Adaptation (AMA) cannot be
used.
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VLT Decentral Drive FCD 302 Operating Instructions
6 wires out of motor
for the
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MG.04.F2.02 - VLT is a registered Danfoss trademark
CAUTION
The electronic thermal relay (ETR) of the frequency converter
cannot be used as motor protection for the individual motor
in systems with parallel-connected motors. Provide further
motor protection by e.g. thermistors in each motor or
individual thermal relays (circuit breakers are not suitable as
protection).
Illustration 2.8 Parallel Connection of Motors
Problems may arise at start and at low RPM values if motor
sizes are widely different because small motors' relatively
high ohmic resistance in the stator calls for a higher voltage
at start and at low RPM values.

2.4.5 Control Wiring

WARNING
UNINTENDED START
When frequency converter is connected to AC mains input
power, the motor may start at any time. The frequency
converter, motor, and any driven equipment must be in
operational readiness. Failure to be in operational readiness
when the frequency converter is connected to AC mains
could result in death, serious injury, equipment, or property
damage.
•
It is recommended that control wiring is rated for
600V.
•
Isolate control wiring from high power
components in the frequency converter.
•
If the frequency converter is connected to a
thermistor, for PELV isolation, control wiring must
be reinforced/double insulated.
•
See section 8.2 General Specifications for control
terminal wiring sizes and maximum loads.
Terminal No. Function
01, 02, 03 Relay1 output. Useable for AC or DC voltage and
resistive or inductive loads.
04, 05, 06 Relay2 output. Useable for AC or DC voltage and
resistive or inductive loads .
2 2
15