SNS20-28C Actuator with Internal Battery Back-up Installation, Operation & Maintenance Manual
Page 18
NEMA 7 ENCLOSURE, GENERAL:
In general, operation and maintenance of a NEMA 7 electric actuator is no different than that of a
NEMA 4 electric actuator. However, there are some precautions that must be followed.
1.
DO NOT
install in ambient temperatures that exceed
140 degrees F
.
2.
DO NOT
under any circumstances
remove the actuator cover
while in a hazardous location
when the contacts are still live, this could cause ignition of hazardous atmospheres.
3.
DO NOT
under any circumstances
use a NEMA 7 electric actuator in a hazardous location
that does not meet the specifications for which the actuator was designed
. The actuator is
clearly tagged with the NEMA classification it was designed for.
4.
DO NOT
mount, test and calibrate actuator on valve in non-hazardous location.
5.
When removing the cover care must be taken not to scratch, scar or deform the flame path
of the cover or base of the actuator, this will negate the NEMA 7 rating of the enclosure.
6.
When replacing the cover on actuators rated NEMA 4 and 7 take care that the gasket is in
place to assure the proper clearance after the cover is secured. After securing the cover
screws check the clearance between the cover and the base - a .002” thick by 1/2” wide
feeler gauge may not enter between the two mating faces more than .125”.
7.
All electrical connections must be to state and local codes and in accordance with the
specifications for which the unit is being used.
8.
After de-energizing the NEMA 7 actuator, wait at least 45 minutes before removing the
cover to allow the heater to cool.
*After proper installation the actuator will require little or no maintenance. In the event
maintenance is required remove it from the hazardous location before attempting to work on it. If
the actuator is in a critical application and down time is not permitted it is advisable to have a
spare actuator in stock.
MANUAL REVISIONS
JUNE 22,
2018
CHANGED EXTERNAL INDICATOR WIRING CONNECTIONS SECTION – CURRENT LOAD USED TO
BE 5A. NEW RELAYS ON BOARD ARE 2A @ 30VDC AND 0.5A @ 125VAC.
MAY 13,
2020
ADDED ELECTRICAL SPECIFICATIONS FOR AUXILIARY SWITCHES/CONTACT CURRENT;
UPDATED INDELAC LOGO.
FEB
3,
2021
“R1” –
NEWLY RE-DESIGNED SNS2000 SERIES W/SMALLER BOARDS AND BATTERY. NEW
BRACKET DESIGNS AND LAYOUT TO FIT ALL INTO SINGLE “L” ACTUATOR ENCLSOURE.
