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VLT
®
HVAC Drive Programming Guide
NOTE!
Warranty-affecting alarms. Certain alarms can affect
the lifetime of the adjustable frequency drive. If one
of these ignored alarms occur while in fire mode, a log
of the event is stored in the fire mode log.
Here the 10 latest events of warranty-affecting alarms,
fire mode activation and fire mode deactivation are
stored.
NOTE!
The setting in par.14-20
fire mode is active (see par. 24-0*, Fire Mode).
3.22.2 24-1* Drive Bypass
The adjustable frequency drive includes a feature, which can be used to automatically activate an external electro-mechanical bypass in case of a trip/
trip lock of the adjustable frequency drive or the event of a fire mode coast (see par.24-00
The bypass will switch the motor to operation direct on line. The external bypass is activated by means of one of the digital outputs or relays in the
adjustable frequency drive, when programmed in par. 5-3* or par. 5-4*.
NOTE!
Important! After enabling the Drive Bypass function, the adjustable frequency drive is no longer Safety Certified (for using the Safe
Stop in versions, where included).
To deactivate the drive bypass at normal operation (fire mode not activated), one of following actions must be carried out:
•
Press the Off button on the LCP, (or program two of the digital inputs for Hand On-Off-Auto).
•
Activate External Interlock via digital input
•
Carry out Power Cycling.
NOTE!
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 adjustable frequency drive!
When the drive bypass function is activated, the display on the Local Control Panel will show 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 will cut in the external bypass according to the below
sequence:
Reset Mode
is disregarded if
MG.11.C6.22 - VLT
®
is a registered Danfoss trademark
No:
Description
4
Line ph. Loss
7
DC overvolt
8
DC undervolt
9
Inverter overloaded
13
Overcurrent
14
Ground fault
16
Short circuit
29
Power card temp
33
Soft-charge fault
38
Internal fault
65
Ctrl. card temp
68
SafeStop
Fire Mode Function
).
3 Parameter Description
Warranty
Critical
Affecting
Alarms
Alarms
x
x
x
x
x
3
x
x
x
x
x
x
x
3-233
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