Temptek G-500 Series, Инструкция по эксплуатации

Страница: 36 / 64

Temperature Control Unit : VTO Series with G500 Series Instrument
Page: 36
TEMPTEK, INC.
525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277
Email: service@Temptek.com
4.1 UNIT WILL NOT START (DISPLAY IS NOT ILLUMINATED)
A. One or more fuses at the main disconnect device are open (blown). Determine continuity
at each fuse. If continuity is not determined, replace the fuse. Then determine cause of
blown fuse.
B. Control circuit transformer fuse is open (blown). Determine continuity at the control circuit
transformer fuse. If continuity is not determined, replace the fuse.
4.2 UNIT WILL NOT START (DISPLAY ILLUMINATED)
A. Power supply is ON. The operator can determine that electrical power supply to the unit
is “on” when the instrument display is illuminated. Even with the main power supply on,
the unit is prevented from operating by one of the following conditions:
1. Water supply pressure inadequate. The display shows
a Fault : System Safety screen. The unit is prevented
from operation without adequate water supply pressure
by the pressure switch. Sufficient water supply pressure
must be present to close the switch.
2. Motor overload switch opened. This display shows
a Fault : System Safety screen. The electric motor is
protected from overload conditions by a set of thermal overload relays. These
relays will open (trip). If the overload relay is open, it must be reset before
operation can continue. An excessive flow condition must be isolated and
corrected immediately.
3. High temperature limit switch open. The display
shows a Fault : System Safety screen. The unit is
prevented from operations at temperatures exceeding
515°F by a “high temperature limit switch”. This switch
is installed in the To Process temperature sensor. If this
switch is open (due to a high temperature condition), the
unit cannot be started and must “cool down” before the
“high temperature limit switch” will automatically reset.
4.3 UNIT STOPS
A. The operator should determine the main power supply to the unit is ON by an illuminated
display. With the main power supply “on”, the unit will be prevented from starting by the
following conditions:
1. Water supply pressure inadequate. The display shows
a Fault : System Safety screen. The unit is prevented
from operation without adequate water supply pressure
by the electrical panel mounted pressure switch.
Sufficient water supply pressure must be present to
close the switch.
System Fault Screen.
Indiacates a water supply or
a pump overload fault.
System Fault Screen.
Indiacates a water supply or
a pump overload fault.
High Temp Limit Fault
Screen.