Gardner Denver DPB Series Instruction Manual page 22

10. Heater Over-Temperature
a. RTD3 is used to detect Heater Over-Temperature.
b. Alarms anytime that the Heater temperature
exceeds 650°F (343°C).
c. On alarm condition, de-energize heat cycle,
stop cycle sequence, display local alarm and
de-energize common alarm relay.
d. This alarm must be manually reset.
11. Blower Overload
a. Alarm condition when blower overload contact
closes.
b. On alarm condition, de-energize heat cycle,
stop cycle sequence, display local alarm and
de-energize common alarm relay.
c. This alarm must be manually reset.
Alarms for Optional Devices
12. Energy Management -
a. High Humidity Alarm:
i. Measured moisture level exceeds the air alarm
value entered through the Program Mode.
b. Humidity Sensor:
i. Under-range: RH% < -15%
ii. Over-range: RH% > 115%
c. RTD:
i. Over-range: Temperature above 448°F
(231°C)
ii. Under-range: Temperature below -20°F
(-28°C)
d. On alarm condition:
i. Local alarm is displayed and the common
alarm relay is de-energized.
ii. If the dryer is set up for Energy Management
Control, the dryer sequence continues, but
bypasses the "HOLD" step and proceeds to
tower switchover after 4 hours of drying.
iii. This alarm is self-clearing, at which time the
alarm LED stops blinking and control switches
back to Energy Management control.
13. Dew Point Sensor
a. High Dewpoint Alarm
i. The user enters an alarm value through the
Program Mode.
ii. If the measured dew point exceeds the alarm
value, the outlet dew point alarm is indicated.
b. Under-range alarm - Dew point below -148°F
(-100°C)
c. Over-range alarm - Dew point greater than
+109°F (+43°C)
20
d. On alarm condition,
i. Local alarm is displayed and the common
alarm relay is de-energized.
ii. If dryer is set up for Dewpoint Control, the dryer
sequence continues, but bypasses the "HOLD"
step and proceeds to tower switchover after 4
hours of drying.
iii. This alarm is self-clearing, at which time the
alarm LED stops blinking and control switches
back to Dewpoint Control.