Bell & Gossett 176R0649C Technologic 502 Series Pump Controller - Manual (Page 35)

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Navigation keys
Navigation keys are used for programming functions
and moving the display cursor. The up and down
keys also provide speed control in local (hand) drive
operation. Drive status indicator lights are also located
in this area.
Back Reverts to the previous step or list in the navi-
gation structure.
Cancel The last change or command will be cancelled,
as long as the display mode has not changed.
Info Displays information about a parameter, com-
mand, or function in any display mode. For example,
in status mode, each display is defined. In menu
mode, menu options are explained. Exit Info mode
by pressing Info, Back, Cancel, or Status.
Navigation Arrow Keys The four navigation arrows
are used to move a cursor between the different items
available in menu or alarm log modes. For operation
in Hand Mode, the up and down arrows regulate drive
speed. For the Master drive in a Master/Follower
system, the arrows control the system speed.
OK Used to select a highlighted parameter from a
parameter list or to enable a parameter choice.
LED indicator lights The green ON LED is activated
and display panel lit when the drive receives power
from mains voltage, a DC bus terminal, or an external
24 V supply.
When a pending fault condition is being approached,
the yellow warning light will come on and a text display
appears in the display area. A fault condition causes
the alarm LED to flash red and a text display appears
in the display area.
Drive operation keys
Operation keys for local (hand) or remote (auto)
control are found at the bottom of the control panel
along with the OFF and Reset keys. The functions of
these keys change based on whether the drive is a
Master or Follower.
Master drive The Hand ON, OFF and Auto On keys
for the master drive control those functions for the
system, made up of the Master drive and any number
of Follower drives. The Hand On key starts the drive
in local control so that the up/down arrows control
system speed including any Follower drives. The Auto
On key puts the system in operational mode depend-
ing on an external start command to run. The Reset
key only resets the Master drive itself.
Follower drives The four operation keys on Follower
drives control the action only for the functions of that
specific Follower drive and no other drive units. Fol-
lower drives must be in Auto On mode for normal
system operation.