HC-20C
6-3
POWER SECTION DESCRIPTION
The following is a brief description of the various parts of the HC test set.
1
HC Controller
Performs all monitoring and control functions for the HC Test Set.
2
Input Power Indicator,
LMP201
Indicates that Input Power is applied to the test set.
3
Control Power Switch,
SW201
Applies 120-Volt AC Power to all of the controls in the test set.
4
Fuse, F201,202
Provides overload protection for the primary side of the control
power transformer T201.
5
Fuse, F203
Provides overload protection for the secondary side of the control
power transformer T201.
6
Fuse, F204
Provides overload protection for the vernier motor controller.
7
Variable Transformer
Circuit Breaker, CB202
Provides overcurrent protection for the variable transformer output
brushes. This circuit breaker must be energized for INTLK to be
cleared.
8
Main Circuit Breaker,
CB201
Applies Input Power to the transformers and relays. An under-
voltage safety release is tied to the interlock circuit for safety
purposes. If the interlock light is lit on the front panel, then the main
circuit breaker cannot be turned on. If the interlock opens during
the operation of the test set, the main circuit breaker will trip.
9
Emergency Off Button,
SW202
De-energizes the output and the main circuit breaker. Control
power will remain energized. Also part of the interlock circuit.
10
Control Power Indicator,
LMP203
Indicates internal 120-Volts AC power has been energized.
11
Output On Indicator,
LMP202
Indicates that the output of the HC test set is energized.
12
Interlock Open Indicator,
LMP204
Indicates that the safety interlock is not reset. The main breaker
cannot be turned on when this indicator is illuminated.
13 Chassis Ground Terminal
Connect to the facility ground with the Ground Cable (see #15)
14 Main Input Power Cables
Connect appropriate power to the test set.
15 Ground Cable
Connect between the Chassis Ground Terminal and the facility
ground.
16 Output Stabs
Connection to the circuit breaker under test.
17 Continuity Binding Post
For use in contact mode, i.e. Normally Closed or Normally Open.
18 Regulator Speed Control
Controls the vernier speed.