Brochure

ELECTRIC ZONE VALVE ACTUATOR
ZMC - DDC Series
Tunstall Corporation
118 Exchange Street • Chicopee, MA 01013
© July 2014
We reserve the right to alter designs, specifications and information without notice.
Phone [phone] · Fax [phone]
www.tunstall-inc.com • www.maconcontrols.com
Bulletin-ZMC-DDC-0714
Electric Operators
4
Calculation of maximum cable length (copper cable) for 24
V rated voltage
L = C x A / n
L Cable length in m
K Constant (269 m/mm²)
A Conductor cross-section in mm²
n Number of Alpha-Actuators
We recommend the following cables for installing a 24 V
system:
Telephone wire: J-Y(ST)Y 0.8 mm
2
Light plastic-sheathed cable: NYM 1.5 mm²
Flat webbed building wire: NYIF 1.5 mm²
Transformer:
A safety isolating transformer according to EN 61558-2-6
(Europe) must always be used. Transformer dimensioning
results from the making capacity of the Macon ZMC-DDC.
Rule-of-thumb formula:
P
Transformer
= 6 W x n
n = Number of Actuators
5) Accessories
• Protection Cap AA SK 1004
Protection against theft and vandalism available for valve
drives with a stroke of 4mm or 5mm.
4.3 Electrical connection