Led Display; Hp-Ib Connector; Power Fuse; Line Connector - HP 7936 Support Manual

Installation And Configuration
7936 and 7937
3-10. LED DISPLAY
The front panel LED display provides the operator
with a visual indication of the operational status
of the drive. The LED display consists of single
red, green, and yellow LEOs. As explained in the
preceding paragraphs, the significance of the LED
patterns is determined by the operating mode of
the drive (RUN TIME or DIAGNOSTIC). The
Front Panel Status label affixed to the rear of the
drive indicates the significance of the LED pat-
terns (see figure 3-2).
In addition to its role as a status display, the Green
LED also serves as an activity indicator, flashing
any time the drive is exchanging data or com-
mands with the host.
3-11.
HP-IB CONNECTOR
The HP-IB connector provides the mechanical
connection for the HP-IB cable which connects
the host and the drive.
3-12. POWER FUSE
WARNING
The power fuse is not an operator-
serviceable part and should only be
replaced by service-trained personnel.
The power fuse protects the drive from an ac
power overload. The same fuse is used regardless
of the input operating voltage. The fuse value is
listed below.
OPERATING
VOLTAGE
All
FUSE
DESCRIPTION
SAS - 250V
3-13. LINE CONNECTOR
HP
PART NO.
2110-0030
The line connector allows the drive to be connec-
ted to an ac power source via a suita ble power
cord. The input power configuration of the drive
is listed on the -LINE label.
3-4
3-14. CPU CONNECTION - HP-IB
SYSTEMS
CAUTION
Do not connect or disconnect the HP-IB
cable(s) from the drive while the system
is in active state.
The interconnection of the drive is dependent on
the system configuration. The location of the
HP-IB connector for the drive is shown in figure
3-1. The major considerations concerning the con-
nection of the drive to an HP-IB channel are con-
tained in the following paragraphs.
3-15. HP-IB CABLING
The Hewlett-Packard Interface Bus (HP-IB) has
certain rules which must be observed or successful
installation of the drive. Cabling is limited to 1
metre per HP-IB load. Typically the Central
Processing Unit (CPU) is 7 equivalent loads and
the drive is 1 equivalent load. See figure 3-3.
The CPU adheres to an HP standard which allows
7 metres of HP-IB cable between the CPU and the
nearest device connected to it and 1 metre of
cable between each additional device. The maxi-
mum configuration is 8 devices (excluding the
CPU) per HP-IB channel of a maximum of 15
metres of 10 equivalent loads.
NOTE
The maximum number of devices that
can be connected to a single HP-IB
channel is host dependent. This informa-
tion is contained in the appropriate host
configuration guide.