Rola-Chem 554200 pH Digital Controller User Manual
Page 8
3.3 Power access panel
Access to terminals is through the back of the enclosure. With the controller
removed from wall/panel, remove four screws holding enclosure panel to enclosure
body.
JUMPER
ACID FEED
BASE FEED
FLOW SWITCH JUMPER
FLOW SWITCH LEADS
FLOW SWITCH TERMINAL
FUSE HOLDER
TERMINAL STRIP
3.3.1 Fuses
Fuses protect the controller from defective feeders. They are located inside the
enclosure. The fuse holders are shipped with 5 Amp fuses.
3.3.2 Flow Switch Terminal
The controller has a flow switch terminal shipped with a ‘jumper’ in place. The terminal
must either have the jumper or a flow switch installed. The flow light on the face of the
controller is also indicates the controller is connected to a live power source. If the
terminal does not have a closed circuit, the controller will not turn on.
To install a flow switch, remove the jumper and attach flow switch leads. The jumper
should be retained to assist in trouble shooting.
NOTE: It is recommended that an inline filter be used to help keep the flow
manifold (including probes) and flow switch free from debris (see Manifold
Operating Manual).
Debris may obstruct flow switch and prevent the switch from functioning.
Rola-Chem Digital Controller PN 554212 6/01/2012 Page: 8 of 12