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7. ANALOG REMOTE CONTROL OPERATION
All remote control cabling should be as short as possible with a maximum length of 10ft
(3.3m).
To control the PHV supply using Analog remote programming, the unit must be equipped
with either the non-isolated Analog interface or the isolated Analog interface options (INA). A
unit equipped with the isolated analog interface has a label or engraving "FLOATING
ANALOG PROGRAMMING" on the rear panel. If the unit is equipped with floating return, the
isolated analog interface should be specified.
The Analog remote control interface allows the user to remotely program the output
voltage/current, turn HV ON/OFF, reverse the output polarity
and current levels. The remote interface does not allow the user to set the OVP limit, this is
only possible via the front panel as described in section 6.4.
The 15-pin D-sub analog interface connector is located on the rear panel of the supply (see
Item 4 in Figure 2). A mating connector is shipped with the unit. It is suggested that interface
connections should use shielded cable with a minimum voltage rating of 500V.
The non-isolated analog interface features ground referenced control and feedback signals.
The optional isolated interface (INA option) features up to 2kV isolation from chassis ground.
7.1.
The Non-Isolated Analog Interface (ANA option)
Note that analog and digital ground (pins 6 and 9) for the external programming
signals are directly connected to HV return/0V terminal. If the HV return has been
disconnected from chassis ground by removing the internal jumper, the
programming signals can float ±300 V.
The Accuracy, Linearity, Stability and Temperature coefficient specifications are not
compromised when programming via the non-isolated analog interface.
The available remote interface signals and pin assignments are shown in Table 5 below.
Pin
Signal
Name
1
CC LED
2
CV LED
3
I-MON
4
VPS
5
IPS
6
Digital
Ground
7
POL-SET
8
V-SET
I/O
Description
O
+15V through 10k when unit is operating in Constant Current mode
O
+15V through 10k when unit is operating in Constant Voltage mode
O
Analog output current monitor signal, scaled 0-10V=0-100% rated
current. Series resistance is 10k
O
Front panel voltage potentiometer wiper connection, scaled 0-10V=0-
100% rated voltage. Series resistance is 10k
O
Front panel current potentiometer wiper connection, scaled 0-10V=0-
100% rated voltage. Series resistance is 10k
Ground for digital circuits
I
Polarity set signal for units equipped with optional electronic polarity
reversal. Open=positive polarity, connected to digital ground=negative
polarity.
I
Output voltage set point, scaled 0-10V=0-100% rated voltage.
Resistance to ground approx. 10M
83550001 Revision C
(1)
, and readback output voltage
26
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