KEPCO BHK-MG 200W (Full Rack) Series - Manual (Page 78)

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BHK-MG (OPR) 022014
b. Use high voltage rated cables (at least 3kV) for all connections, even for programming
connections. Where required use twisted pair cable or shielded single or pair cable
(shield to chassis), rated for high voltage.
c. Even though the BHK-MG Power Supply will discharge the output capacitor at turn-off,
verify that the output is safe before making any attempt to connect or disconnect the
load.
d. Verify that the input circuit breaker is off and remove the line cord before connecting or
disconnecting the load or other external components to analog programming terminals.
e. If possible, connect one side of the output to ground (either side may be grounded).
The power supply can also operate with the output “floating” with respect to ground.
The following warnings and cautions apply to the output terminals:
• If the external equipment (e.g., Digital Voltmeter) has floating inputs and the power sup-
ply is operating with +OUT terminal connected to ground, connect the LOW input of the
external equipment to +OUT terminal of the power supply.
• If the external equipment (e.g., Digital Voltmeter) has floating inputs and the power sup-
ply is working with –OUT terminal connected to ground, connect the LOW input of the
external equipment to –OUT terminal of the power supply.
• If the power supply outputs should stay isolated from ground, any external equipment
connected to the output terminal should be connected to a-c source power using an iso-
lating transformer, or should have floating inputs.
NOTE: Any isolating transformer used for connecting test equipment to a-c source power
should have the isolation rated to a value higher than the maximum output volt-
age of the power supply.
The following warnings and cautions apply to the analog programming terminals because the
analog control circuitry operates at the +OUTPUT potential and the common of the analog con-
trol circuitry is connected to the +OUT terminal (TB1) through the sensing resistor (Rs) of the
power supply.
• If the power supply is operating with +OUT terminal connected to ground, do not connect
grounded inputs or outputs of any external equipment to power supply analog program-
ming terminals. If this situation is unavoidable, connect the external equipment to a-c
source power using an isolating transformer. For external equipment with grounded out-
put only, use the uncommitted amplifier of the power supply in differential configuration.
• If the power supply is operating with –OUT terminal connected to ground, the external
programming source must be isolated up to the maximum output voltage plus 1KV. The
programming source must be either battery powered or powered through an isolation
transformer and feature “fully insulated controls and chassis.”
WARNING
WARNING