Despatch Protocol Controller - Manual (Page 46)

PROBLEM/
SYMPTOM
PROBABLE
CAUSE
SUGGESTED CORRECTIVE ACTION
40
Temperature
runaway - heater
will not turn "OFF" Shorted SSR
Relay
Defective
controller
Disconnect the one of the SSR leads (SSR terminal #3 or
#4). If the heater stays "ON", Replace SSR.
If heater turns "OFF", controller may be defective
(check
DIAGNOSTICS MODE ).
The center of the
chamber
temperature is
different from the
control
temperature
displayed The hot air
entering the
chamber will be
the hotter than
center of the
chamber. Change the CZO value in the Tune Mode to shift the
controller’s displayed readout to the temperature in the
center of the chamber.
No digital display
with the power
LED ON The control power
supply is defective Replace the Protocol controller.
Test SSR gate
signal output Connect a VOM (set on 20vdc/higher scale) across the
SSR Relay input terminals (SSR terminal #3 and #4)
1) Adjust the setpoint temperature a minimum of 20°C
degrees above the process displayed temperature
(output should measure approximately (+)15vdc).
2) Adjust the setpoint temperature a minimum of 20°C
degrees below the process displayed temperature
(output should measure 0vdc).
3) Adjust the setpoint temperature at the process
displayed temperature (voltage output should pulse
somewhere between 0vdc & 15vdc).
4) If the controller output voltage does not follow the
levels listed above, replace controller.
Keypad does not
work or only some
of the keys beep Defective Protocol • Turn the power ON and OFF by cycling the Green
Power Pushbutton.
• Press the Reset key.
• Replace Protocol.
Hi-limit relay does
not click or pull in
when pressing the
HEATER ON
pushbutton
No power or
voltage to the
Protocol to
energize the relay
(ex. airflow switch
is not closed).
The Protocol hi-
limit is not
energizing relay
even if the Heater
Relay LED is
ON or
faintly lighted.
• Check the incoming wiring and voltage.
• Check for loose wiring connector.
• Check both the incoming and output wiring and
voltage.
• Check for loose wiring connector.
• Replace Protocol.
No Events are
displayed in Profile Events not
enabled The CODE*E* is located under Tune Mode. Using the
same code as required for the Tune Mode, change the
number of relays to the number of events being used (ex.
Display indicates zero (0) relays used change the number
to one (1) for Event One).