MAGUIRE LPD-30, Установка, эксплуатация и обслуживание

Страница: 85 / 127

Maguire Products, Inc.
Edition: November 5, 2010
85
LPD Dryer
®
5.2.3 – Heater Safety Switch Tripped
The heater is controlled by software turning power on and off every second. The
percentage of ON time, displayed during operation, gives some indication as to how hot
the material has become. As material comes up to temperature, the percentage ON
time becomes lower. The displayed temperature is the inlet air as it enters the heating
canister. If the system does not show an increasing temperature within
a set time after cycle start, an air flow or heater problem is indicated, and the system
shuts down.
There is one high temperature SAFETY CUT OFF switch. One is mounted directly to
the heater element cartridge. If the blower fails or the air stream is blocked, overheating
of the heater element cartridge will trip this safety switch at 300 degrees F (150C). The
switch will break the control power to the heater relays, which will result in a FAIL SAFE
ALARM condition. (See Alarm Conditions on page 81). The switch is MANUAL reset
only, and you may have to remove the rear cover to access this. We do this so you will
then be able to inspect all internal parts closely. The switch should never trip. If it does,
something else has failed.
5.2.4 – Filter Clogged
A clogged filter will result in a lower then usual heater on-
time duty cycle and a delay in reaching temperature. The
partially blocked, slower moving air cannot remove heat
from the heating element as effectively, and therefore the
heater on time percentage is lower. A delay in temperature
rise will eventually result in an alarm.
Your particular processing conditions will determine how
frequently this filter should be checked or cleaned.
See Clean / Replace Air Filter on page 63.
LPD 100, 200 filter location
(left side of Dryer)
LPD 30 filter location
(behind front door)