Graco Therm-O-Flow Plus, Instructions Manual

Page: 51 / 82

51 309085
Communication Errors
If the pendant experiences communication errors, all
communication to all devices is shut off and the pen-
dant will continue to display an error message and
beep approximately every 5 sec until the operator
acknowledges the error. This means the TIMER is shut
off and the X-OVER is disabled.
To acknowledge the error, depending on the type of
error, press the TIMER icon or the X-OVER icon from
the MAIN menu. At that point acknowledge the error if
displayed by pressing F3 (OK) and fix the communica-
tion problem. The TIMER must be restarted as well as
the X-OVER.
If starting the X-OVER when no cross-over modules
exist on the system, these errors will occur and the
X-OVER will be disabled. (Starting the X-OVER
automatically ENABLES it, expecting to communicate
with cross-over modules mounted to each unloader
assembly.)
NOTE: With systems that include cross-over assem-
bly modules, if communication to the cross-over con-
trol boxes mounted to the side of each unloader as-
sembly main control is interrupted, the modules will
return to their OFF state. The GREEN and AMBER
lights will go out and the air solenoid of the unloader
will not be allowed to turn on. If this happens, the
Quatech communication module within the cross-over
control box will blink, indicating that it had timed out
and is ignoring all commmands from the pendant.
(The pendant is constantly sending commands to the
cross-over module to ensure it is operating properly,
thus allowing the solenoids to operate and continue
with cross-over functions). After fixing the communica-
tion problem,
CYCLE POWER to the control panel(s),
or unplug the pendant and reconnect, and check for
proper operation of the cross-over assembly.
Contacts Available for Connection to
External Equipment
A series of dry contacts are available for customer
monitoring of the status of the heat zones of the con-
trol and the drum empty/low status.
The following connections are available for monitoring.
The contact ratings are 10A at 28VDC and 13A at
120VAC to 277VAC.
Terminals 3081 & 3101 TEMPERATURE WITHIN
LIMITS
CLOSED (continuity) indicates ALL zones are
within operation limits (the operating window). See
page 26.
OPEN, one or more zones are not within operating
range. (See READING TEMPERATURE CON-
TROLLERS section.)
Terminals 3131 & 3141 NO HIGH TEMPERATURE
ALARM
CLOSED (continuity) indicates ALL zones are not
in high temperature alarm. Thus the actual temper-
ature (PV) is below SV + 40
F (22 C).
OPEN, one or more zones are in HIGH TEMPERA-
TURE alarm.
Terminals 3161 & 6171 DRUM NOT EMPTY/LOW
(when equipped with low level switch kit or
cross-over modules assemblies).
CLOSED (continuity) indicates the drum is NOT
empty/low.
OPEN, the drum IS EMPTY/LOW.