KEPCO JQE 150-1.5MVPY-26956 Half Rack - Manual (Page 15)

JQE 26956 081111
1-5
The Current Monitor signal accuracy is 1% of the nominal Current Limit “A” value. The internal
impedance of the C-MON output signal is less than 50Ohms. The recommended withdraw cur-
rent from this output is 2mA. This output is protected against temporary or permanent short-cir-
cuit. The short-circuit current is 5mA.
WARNING
The C. MON signal is referenced to –OUTPUT (INTERNAL), prior to the 0.01Ohm
sensing resistor of the C. MON circuitry. Care must be taken when handling this
signal to avoid short-circuiting the output of the unit
1.7.4 DYNAMICS
a) VOLTAGE RECOVERY FOR STEP-LOAD CURRENT: The time required for the stabi-
lized output voltage to recover within the load effect band (or 2 mV, whichever is greater)
is less than 50 microseconds.
b) CURRENT RECOVERY FOR STEP-LOAD VOLTAGE: The time required for the stabi-
lized output current to recover within the load-effect band is governed by an (exponen-
tial) RC time constant, where "R" represents the load resistance and "C" is the tabulated
(Table 1-1) shunt capacitance.
c) PROGRAMMING SPEED: The rate at which the JOE power supply responds to a step-
program is determined by the setting of the current limit control, the value of the load
resistance and the tabulated (Table 1-1) shunt capacity.
d) OUTPUT IMPEDANCE (See Table 1-1): The DC and low frequency value is given by the
tabulated (Table 1-2) load effects. With increasing frequency, the output impedance
becomes asymptotic to the tabulated (Table 1-1 series inductance (Voltage Mode) or
shunt capacitance (Current Mode).
1.7.5 GENERAL
a) CROWBAR SPECIFICATIONS: The electronic "crowbar" circuit consists of a silicon con-
trolled rectifier (SCR) and a sensing amplifier. If the output voltage exceeds a pre-viously
set adjustable limit, the power supply output is shorted by the SCR and the input circuit
breaker is tripped off.
1) Adjustable Limit Range: 5% of E
Onom
. to 1.3 x E
Onom
.
2) Triggering Time: 5 - 10 µS, with adjustable delay (25 ±5µS to 180 ± 40µS) to minimize
false triggering.
3) Threshold: Limit point may be set to within 5% of E
Onom,
or 0.25 Volt, whichever is
greater.
b) METERS: Two 2 inch, recessed panel meters, 3% of full scale accuracy are provided for
output voltage and current monitoring.
1.8 SPECIFICATIONS, MECHANICAL
a) DIMENSIONS AND FINISH: Refer to Mechanical Outline Drawing, Figure 1-1.
b) BAIL: A retractable bail is provided for convenient bench operation of the power supply.