Product manual

MultiPoint Level Control System
21
E 2001 Nordson Corporation
All rights reserved
321 351A
Issued 7/01
69–LVL–EH–IS–01
The level control may be set for any of three modes:
S OFF: The RIA 450 Level Controller does not function.
S AUTO: The RIA 450 Level Controller circuitry activates the
pump/automatic gun when the level of material in the tank/hopper
reaches the REFILL START setpoint and deactivates the
pump/automatic gun when the level reaches the REFILL
SHUTOFF setpoint. An alarm sounds when a high or low alarm
setpoint is reached.
S MANUAL: The RIA 450 Level Controller circuitry turns the
pump/automatic gun on (fills feed unit) until the operator sets the
switch to OFF (deactivating the pump/automatic gun).
When set to Auto, the RIA 450 Level Controller normally activates the
pump/automatic gun as required and the Normal lamp on the enclosure
door stays on.
Low Level
If the RIA 450 Level Controller senses that the material in the
tank/hopper is at the Low Level Alarm Setpoint:
S The ALARM sounds.
S The NORMAL lamp goes off.
S The red UNDER lamp goes on.
The equipment operator must:
S Press the horn SILENCE button to deactivate the alarm.
S Begin the Refill process in the tank/hopper with material. The
refill unit will stop when the Refill Shut Off Setpoint is reached (the
UNDER lamp goes off and the NORMAL lamp goes on). Refer to
the Troubleshooting section in this manual.
High Level
If the RIA 450 Level Controller senses that the amount of material in the
tank/hopper is at the High Level Alarm Setpoint:
S The ALARM sounds.
S The NORMAL lamp goes off.
S The red OVER lamp goes on.
Operating Modes
Indicator Lamps and Alarms