MAGNET POWER SUPPLY SYSTEM 9100
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DANFYSIK A/S - DENMARK.
The selection between the RS232, RS422 and RS485 mode is done through straps located on
the Control Module. Please refer to chapter 3.3.2 for these strap settings.
4.3.7
Current & Voltage loop
In this block, internal and external set current and voltage are preformed and are built around
A501, A508, A 513 and A514B. Detection of current/voltage mode consists of A511A.
Summation of the current and voltage of more units in parallel is also preformed in this block.
The circuit consists of A504A and A504B.
4.3.8
Control
The output voltage and current are monitored by this block. A801B monitors the output current
and A801A the output voltage while readback of the set output current and set voltage is
monitored by A802B and A802A respectively.
4.3.9
Soft start
The soft start circuit enables the Power Amplifier to smoothly ramp up the output current. This
circuit has nothing to do with the normal ramp time controller in the regulation circuit, but
ensures only a proper start of the Power Amplifier.
The circuit is build around A509.
When the "main power signal" switches on the integrator output ramps slowly up until D510 is
reversed. It takes about 3 seconds to ramp to max output.
Soft Start pulls down the current limit signal via D510. Slowly this voltage increase and finally
the D510 are reversed.
4.3.10
Interlock
Internal interlock except fan UV detection and status signals are connected directly without
galvanic isolation. External and fan UV detection interlock are galvanic isolation with
optocoupler.
The latched interlock information can be seen from the LED‟s, on the local control panel, on
the display board and is activated in the Digital interface.
Each interlock is individually connected to a SR latch. Every time an edge transition is detected
it will be latched in a SR latch. The first one though will be latched on arrival of the delayed
sum interlock.
On arriving of the first interlock, the SR latch will store this interlock.
