Double Hit Mode
The Double Hit mode is for very soft joint applications. When an electric screwdriver runs down a fastener and the tool clutches off once
the preset torque is achieved there can be some joint relaxation that can occur. The Double Hit mode has the electric screwdriver perform
a second hit to stabilize the torque for joint relaxation.
Joint relaxation is caused by the surface of part(s) embedding or by "soft parts" such as gaskets, plastics or spongy material, which
collapses under the clamping force created in a torque condition. For Hard Joint applications there is no need to use the
Double Hit mode.
Press the "sT" button continuously until the power light turns
Red
.
The clutch of the electric driver works twice at the set torque under the "Double Hit" mode. The Double Hit will increase the repeatability
accuracy at the target torque by double checking.
Note!
The STC 30 Plus models that are designed with Double Hit Mode and Soft Start mode features are not functional with any BF-
Series electric screwdrivers. The Double Hit Mode and Soft Start mode features are built-in to the “Plus” models of the BF-
Series electric screwdrivers.
STC30 Plus (v4.1) Transformer
(Rev 1.0 8/8/08)
Corporate Headquarters:
1080 North 11th Street, San Jose, CA 95112 Phone: (408) 292-2214 Fax: (408) 292-2733
www.etorque.com
Page 3
OCP (Over Current Protection)
The power will shut down automatically when the current exceeds 12 - 13A. The controller should be reset by turning off the power switch
for one minute and turned back on. If the current is not over the limit, power will turn on.
There is another OCP in a secondary circuit. The power will be disappear for 5 seconds when the current is over 4A over 3 seconds or
when current is over 6A over 0.5 seconds. The transformer recovers automatically. The transformer gives an alarm signal by blinking Green
and Orange color on the LED lights along with beep buzzer sound.
Description
Primary OCP
Secondary OCP
Detection
Limit current
Time duration
12 ~ 13A
immediately
Condition A
Condition B
4A
6A
3 sec.
0.5 sec.
Protection
Whole power shuts
down permanently
Output power disappears for 5 sec.
Protection
Signal
LED
Buzzer
no
no
blinking
Green Orange
Off
blinking
Orange Off
Normal frequent
beep On/Off
Higher Frequent
beep On/Off
Recovery
Turn off the power switch
and on after 1 minute
Auto recovery after 5 sec.
Over Heat Protection
The thermistor will shut down whole power supply if the unit over heats. The controller should be reset by turning off the power switch for
one minute and turned back on. If the current is not over the limit, power will turn on.
Ratcheting Clutch Alarm
An alarm and break system notifies you when the ratcheting clutch occurs with an electric screwdriver. If the tool ratchets continuously 5 or
6 times, the STC-30 Plus will provide a buzzer alarm along with the red LED light Also it will stop the output power for 5 seconds as a
secondary protection.
