hivolt HA61-3B30, Руководство по эксплуатации

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3.6 Current Limit
By means of command SL1 the instantaneous value of the output current can be limited to a
programmable value. It can be set to a maximum of 60mA.
This is independent from the average output current shutdown limits, set by commands
SL2 and SL3 .
The shutdown limits are parametrized by two parameters: shutdown current limit and averaging time.
Positive and negative output currents are measured and averaged independently. When the averaged
positive or negative output current exceeds the programmed limit, the amplifier shuts down with
Overload .
The average limits can be set up to 30mA which equals the maximum DC output current of the
amplifier.
Parameters:
IO_LIM:
instantaneous output current limit [mA];
IHVP_SDN_LIM: positive output current shutdown limit [mA];
IHVP_SDN_TIM: positive output current shutdown averaging time [ms]; eight discrete values;
IHVN_SDN_LIM: negative output current shutdown limit [mA];
IHVN_SDN_TIM: negative output current shutdown averaging time [ms]; eight discrete values.
These parameters can be set independently.
Limiting the instantaneous value of the output current will not result in a shutdown condition but it has
an influence on the dynamic behavior of the output. The reduced output current leads to reduced
output slew-rate and bandwidth. It might be necessary to adjust the PID control parameters.
Setting the instantaneous output current limit to maximum and setting the shutdown limits to lower
values can be used to protect sensitive loads while preserving the high dynamic capabilities of the
amplifier.
3.7 Inhibit
The high voltage amplifier output can be remotely switched off using the Inhibit functions. One TTL
compatible BNC INHIBIT input and one 24V compatible INTERLOCK.INH input on the INTERLOCK
connector are provided. In case of a HIGH signal on either input, the amplifier output is forced to 0V.
Inhibit can also be activated by using command
ENA . The status of the enable condition can be read
from Status Word 1 (command RS1 ).
During Inhibit the internal high voltage sources are not turned off. The Inhibit functions can be used to
turn on and off the amplifier output relatively fast, independent from the analog input control signal.
The
Inhibit functions are not suitable to achieve a safe state at the amplifier output. They must not be
used for safety relevant purposes.