Drive Bypass - Danfoss VLT FC 102 Programming Manual

Programming Guide | VLT® HVAC Drive FC 102

24-1* Drive Bypass

6.24.2
The drive includes a feature which can be used to automatically activate an external electro-mechanical bypass if the drive trips or if
there is a fire-mode coast (see parameter 24-00 Fire Mode Function).
The bypass switches the motor to operation direct on line. The external bypass is activated by 1 of the digital outputs or relays in the
drive when programmed in parameter group 5-3* Digital Outputs or parameter group 5-4* Relays.
After enabling the drive bypass function, the drive is no longer safety certified (for using Safe Torque Off in versions where this
function is included).
To deactivate the drive bypass at normal operation (fire mode not activated), carry out 1 of the following actions:
Press [Off] on the LCP, or program 2 of the digital inputs for Hand-On-Off-Auto.
l
Activate external interlock via digital input.
l
Carry out a power cycle.
l
The drive bypass cannot be deactivated if in fire mode. It can be deactivated only by either removing the fire mode command
signal or the power supply to the drive.
When the drive bypass function is activated, the display on the LCP shows the status message Drive Bypass. This message has a higher
priority than the fire mode status messages. When the automatic drive bypass function is enabled, it cuts in the external bypass
according to the sequence shown in
Alarm
Speed
Operation
Alarm
Bypass
Delay
Timer
P24-11
ON
Relay
"Bypass"
OFF
Figure 100: Drive Bypass
The status can be read in the extended status word 2, bit number 24.
24-10 Drive Bypass Function
Default value: [0] Disabled
Setup: 2 setups
Data type: Uint8
546 | © 2024.10
Figure 100.
Auto Resets Auto Reset Disabled
On delay (P5-41)
NOTICE
NOTICE
Parameter type:
Conversion index:
Change during operation:
Parameter Descriptions
option
–
True
AU430028034214en-001901 / 130R0310