Emerson EVH Series, Installation Manual

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The motor may or may not be running depending on the controls. OFF
mode, the motor is not powered and is not running.
Mode selection is dependent on the options provided. As standard, the three modes can always be selected from the VFD
keypad. The BYPASS or VFD mode is selected by using the Left Soft key and the OFF mode by pressing the OFF/ Stop key.
Under some circumstances there may be a delay in the actual start of the motor when in the bypass mode. Refer to
application manual and parameters P10.1.2 Bypass delay start and P10.1.4 Auto Bypass Delay Start for more information
about these delays.
An optional door or cover 3-position selector switch can be provided to override the VFD keypad mode selection and set the
system to OFF or BYPASS.
• If unit has SW1 option on cover or door, place in OFF position
• Apply power and close disconnect
• Keypad should power and display Startup Wizard
• The Keypad display should show “BYPASS” above the left keypad soft button. Pressing the button should give you the
message “Switch to Bypass- Press OK”
Note: The BYPASS/VFD mode selection using the Soft Key on the keypad will only appear if the BYPASS mode has been
enabled in software by using the startup wizard or direct entry using parameter P10.1.1
Using the keypad to select the mode
Mode selection is made from the VFD keypad using the Left soft key. The selection is shown above the key and the display
will indicate the next mode to be selected by pressing the key and not the active mode.
Some bypass designs have an optional VFD-OFF-BYP switch located on the cover or door of the unit. The switch must be in
the VFD position in order for the keypad to select the desired mode as described above.
Using the switch to select the mode
• Some bypass designs have an optional VFD-OFF-BYP switch located on the cover or door of the unit. The switch selects
where the mode is determined.