3-22 CHP Max™ Headend Optics Platform Chassis, Controllers and Power Supplies Rev D
The factory-default threshold and deadband values for each parameter are listed in
Table 3.7. A deadband or hysteresis value prevents alarm oscillation. Once a threshold is
exceeded, the alarm can only be downgraded if the parameter is at least a deadband below
the threshold value.
➤ To adjust the alarm threshold limits
1. Connect the serial cable between the CMM’s (or SMM’s) DB-9 Craft interface and the
computer containing the Craft Management Software.
2. Launch the CHP Max Craft Management Software application. The Main screen opens
automatically after the program is launched.
3. Check to ensure that the proper COM port is selected in the Communication menu.
Select an alternate port if necessary.
4. Click the Disconnected button or click Communication > Connect on the Craft
terminal to initiate communications with the chassis. The interface indicates
connection status.
5. The Installed Modules window opens and indicates the communication status with
color-coded arrows.
6. Double-click the Fan module identifier in the module inventory or double-click on
any of the eight fans on the rear of the chassis in the image map to open that Fan
Bay’s management window.
7. Right click on any of the eight Fan current meters and select Configure from the
shortcut menu. Refer to Figure 3.14.
Table 3.7 Factory-default Threshold and Deadband Values
Parameter Major
Low
Minor
Low
Nomina
l
Minor
High
Major
High
Shutdown
Threshold
Deadband
Fan 1 through 8 Current
CHP-CHASSIS-R-19 (mA)
150 150 215 450 450 N/A 1
Fan 1 through 8 Current
CHP-CHASSIS-R-19Q and
CHP-CHASSIS-R-19U
(mA)
59 61 85 448 450 N/A 1
Note If your computer does not have 9-pin female (DB-9F) serial connector, use
cable (P/N CHP-RS232-USB) that has a DB-9F connector that plugs into the Craft
Interface connector on either the CMM or SMM and the other end of the cable has
a USB-A male connector.
Note The alarm thresholds for Fan 1 current through Fan 8 current are not
independent. Changing the alarm threshold value on any of the fan meters will
automatically update the alarm thresholds on the other seven fan meters.
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