Setup For The 920 - Pentair 920 Series Installation, Operating And Maintenance Instructions

2.9 setup for the 920

INDUSTRIAL HEAT TRACING SOLUTIONS
The 920 may be programmed using the optional 920 Operator Console, or a Group
Communications Controller (GCC) if the modem commu-nications option is installed. For
instructions on the operation of these devices, refer to the corresponding operating manuals.
For complete instructions on programming the 920, see the Section 3 on page 18.
2.9.1 voLtaGe readInG setup
The 920 series control module is tested, calibrated, and ordered separately from the switch
interface modules which contain the voltage sensing circuitry. This prevents Pentair Industrial
Heat Tracing Solutions from calibrating the control modules to specific switch interfaces and
removing any component inaccuracies. Generally, the voltage readings will be within 3 Vac to 5 Vac
when shipped from Pentair Thermal Managament. If more accurate voltage readings are desired,
they may be adjusted as part of the initial setup of the controller. This requires measurement of
the trace voltage using a multimeter and adjusting the VOLTAGE TURNS RATIO setting to arrive at
more accurate voltage readings. See section 3.5.21 on page 26.
2.9.2 sWItCh ratInG setup (ssr onLy)
The 920 series control module is ordered and shipped as a separate item from the enclosure
assembly. This prevents Pentair Thermal Managament from predetermining the SWITCH
CURRENT RATING settings since various types of output switches are available.
The user should verify that the switch current ratings are set properly for the rating of the solid-
state relays that are included as part of the enclosure assembly. Refer to section 3.5.7 on page 22
for more information on the SWITCH CURRENT RATING setting. Pentair Thermal Managament
default setting is defined in Appendix F on page 76.
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