Danfoss VLT HVAC Series Programming Manual page 12

2 How to Program
Operation Keys
Keys for local control are found at the bottom of the control panel.
2
[Hand on] enables control of the adjustable frequency drive via the LCP. [Hand on] also starts the motor and it is now possible to enter the motor speed
data by means of the arrow keys. The key can be selected as
External stop signals activated by means of control signals or a serial bus will override a 'start' command via the LCP.
The following control signals will still be active when [Hand on] is activated:
• [Hand on] - [Off] - [Auto on]
• Reset
• Coasting stop inverse
• Reversing
• Set-up select lsb - Set-up select msb
• Stop command from serial communication
• Quick stop
• DC brake
[Off] stops the connected motor. The key can be selected as
If no external stop function is selected and the [Off] key is inactive, the motor can be stopped by disconnecting the line power supply.
[Auto on] enables the adjustable frequency drive to be controlled via the control terminals and/or serial communication. When a start signal is applied
on the control terminals and/or the bus, the adjustable frequency drive will start. The key can be selected as
on] Key on LCP .
NOTE!
An active HAND-OFF-AUTO signal via the digital inputs has higher priority than the control keys [Hand on] [Auto on].
[Reset] is used for resetting the adjustable frequency drive after an alarm (trip). It can be selected as
on LCP
.
2-8
Figure 2.5: Operation keys of the numerical CP (NLCP)
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MG.11.C6.22 - VLT ® is a registered Danfoss trademark
VLT ® HVAC Drive Programming Guide
130BP046.10
[Hand on] Key on LCP
.
[Off] Key on LCP .
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[Auto
[Reset] Key