Instruction manual

IMP I IMP/P I SAM Hot Runner Controllers Instruction Manual
16
the over temperature LED will flash, and relay
closure will occur.
b. Under Temp. : Occurs when an IMP-15 thermocouple
is 30 ºF (17 ºC) or more below setpoint. The
speaker will emit a low-pitched audio tone of about
1 KHz repeating about once per second. At the same
time, the under temperature LED will flash, and relay
closure will occur.
c. Over Temp. Alarm Priority: If an over temperature
and under temperature condition exists simultane-
ously from more than one IMP controller, SAM will
indicate only the over temperature condition. SAM
will not recognize any under temperature condition,
until all over temperature alarms have been cleared.
3. Front Panel Output Connector: A set of relay contacts is
available at this connector for use with external equipment
if desired. Observe the 5 amp maximum contact rating.
Pins 1 and 2 have Normally Closed contacts. Pins 1 and 3
have Normally Open contacts.
a. During either an over temperature or under tempera-
ture alarm condition, the relay will be energized.
b. Relay operation is defeated when the Low
Temperature Alarm mode switch is in the Inhibit ( )
position. (This will be clarified in the next section.)
4. Low Temperature Alarm Mode Switch: This switch gives
the operator the ability to defeat both the low temperature
audio alarm and output connector relay operation. This
feature is useful to avoid sounding an alarm during startup
or cooling down procedures. The under temperature LED
is unaffected by this switch. All over temperature alarm
indications are also unaffected by this switch.
a. Low Temp. Alarm Active : In this position, under
temperature alarm indications operate normally.
b. Low Temp. Alarm Inhibit : In this position, an under
temperature condition of 30 ºF (17 ºC) or more below
setpoint will not sound the audio alarm. Also, the
output connector relay will not be energized. The
under temperature LED is unaffected, and will flash
as usual.