8
OUTPUT
POWER
INPUT
95 96 98
L1 L2
RESET
③
SHOCK TIME knob
0.2-10sec
TEST
MON LED
①
START TIME knob
0.2-30sec
CT
②
CURRENT knob
OC LED
10. Construction
Description
Shock Relay senses the motor current passing through the two CTs and automatically
detects the starting of the motor.
Shock Relay filters out the large starting current during the start-up delay preset with the
START TIME knob.
Shock Relay detects an overload by comparing the CT-sensed motor current with the trip
current that is preset with the CURRENT knob.
When the motor current exceeds the preset trip current level, the Shock Relay trips after the
trip delay that is preset with the SHOCK TIME knob.
Shock Relay can be used as an electronic shear-pin for a motor-driven machine.
Every time that the Shock Relay trips, always investigate the cause of the overload and
correct the cause.
Release the tripped Shock Relay by pressing the RESET button or by shutting power down
before restarting the equipment.
As a fail-safe, the Shock Relay keeps the built-in output relay operating except when trips
occur, provided that power is applied to the Shock Relay.
Shock Relay lights the OC LED when sensing a greater current than preset with the
CURRENT knob and remains lit after the relay trips. MON LED (green) shows monitor
condition. It is turned on under the normal monitor condition, and the relay turns off the lights
while it is outputted.
Shock Relay provides a TEST button to confirm the operation of the output relay and the two
timers
－
START TIME and SHOCK TIME. The Shock Relay trips after the total of the
START TIME and the SHOCK TIME when the TEST button is pressed and held.
T1
Motor speed
Shock Relay
trips
Motor current
Ampere
TIME
Preset
Power
Input
MOTOR
STOP
OVER LOAD
T1<T0
①
START TIME
③
SHOCK TIME
( T0 )
②
Current
Output
Relay
MAX 0.5s
③
SHOCK TIME
( T0 )
OVER LOAD
T0<T2
T2
OC LED
Flicker
Continue
Flicker
