SL SERIES MANUAL
22
118006-001 REV T
5.7 Floating Ground
Low Leakage--FGLL
The Low Leakage floating ground option also provides
isolation of the power supply common from the chassis
ground with a maximum leakage current of 10nA. The
typical connections are the same as for the regular
Floating Ground Option described in Section 5.6. As
stated above in the FG Option description, the FGLL
leakage current is also comprised of two components.
The 60Hz component is the same as the FG option
(<1
μ
A). However, in the FGLL option the HVDC
leakage current is less than 10 nanoAmps.
The power supply common must be connected
to the chassis ground through a low impedance
circuit. The power supply common is clamped
to the chassis ground using a power zener
diode. This diode is not intended to clamp under
continuous operation. On higher current units
the power dissipation within the zener diode can
be excessive if allowed to clamp.
5.8 Adjustable Power
Trip/Constant Power Control
(TB1 only)--APT/CPC
The power control options allow monitoring and control
of the power supply output power. The APT option
allows the user to remotely adjust the power limit for the
power supply. If the power limit is exceeded, the unit
will shut down with an OVERPOWER fault. The CPC
option allows power regulation via an internal preset
potentiometer, or a remote program source. When the
unit is in power regulation, the POWER CONTROL
status indicator will be illuminated. See Figure 5.2 for
remote interface.
5.9 Arc Trip Option--AT
When this option is ordered, the Arc Count circuit is set
so the unit trips to Standby after 1 count. One of the
applications for this option is for sensing a material
breakdown under an applied high voltage.
5.10 Reversible
Polarity Option--PN
5.10.1 Models from 1 kV to 8kV
For units from 1 kV to 8kV, the polarity may be reversed
in the field by following the procedures shown in Figure
5.3.
IMPORTANT
5.10.2 Models From 10Kv To 130Kv
When this option is ordered, a second multiplier is
provided to permit the user to replace the existing
multiplier with another of reverse polarity. See Figure
5.4 for a step by step procedure.
5.11 Instant On--IO
When the Instant On Option is ordered, the High Voltage
is enabled as soon as line voltage is applied when the
circuit breaker is in the ON position. (See Figure 5.7)
To enable Instant On, keep the jumper between TB1-14
and TB1-15 attached. Connect an additional jumper from
TB1-15 to TB1-16 as shown in Figure 5.7.
CAUTION
The Power Supply will generate programmed
High Voltage whenever the circuit breaker is in
the ON position, and line voltage is applied.
