16
When multiple motors are used, VLT 6000 elec-
tronic thermal relay cannot be used to provide
individual motor protection. A separate motor over-
load must be supplied for each motor.
If the multiple motors are of significantly different sizes, starting problems
may occur. This is because the higher electrical resistance of smaller
motors will require more start voltage than larger motors.
CAUTION
!
Automatic Motor Adaptation and Automatic
Energy Optimization cannot be used for mul-
tiple motor installations.
External DC Bus Connection
Terminals 88 and 89 access the DC bus of the drive. They can provide
DC backup power for the drive or to connect to a 12-pulse input
rectifier.
DANGER
!
Terminals 88 and 89 will be at approximately
150% of line voltage and remain at high volt-
age for up to 14 minutes after power has been
removed from the drive.
WARNING
!
Do not connect anything to terminals 88 and 89
without first consulting with Danfoss Graham.
High Voltage Form C Relay
The connections for the high-voltage relay are terminals 01, 02, 03.
The high-voltage relay is programmed in parameter 323, Relay
Output 1.
1+3 normally closed, 1+2 normally open
Max. 240 VAC, 2 Amp
Min. 24 VDC, 10 mA or
24 VAC, 100 mA
Max. wire gage:
10 AWG (4 mm
2
)
Terminal Torque:
5 in-lbs ( 0.5 - 0.6 Nm)
Multiple Motors
The VLT 6000 can control several motors at once, all changing speed
together. The sum of the nameplate currents of all the motors must not
exceed the current rating of the drive.
WARNING
!
Electronic Control Terminals
