KMC Controls MEP-455 Series - Manual (Page 5)

Document No. 129-361
Installation Instructions
August 3, 2004
Mechanical Range Adjustment
EA0278R1
1
3
2
EA0279R1
5
4
Figure 9. The Angular rotation is adjustable between
0° and 90° at 5 Degree Intervals.
Make sure the actuator is in the zero position when
making this adjustment. If making the adjustment
before the actuator is in service, take into account
the 5° preload. To release the preload, see Manual
Override section.
Other settings
For adjustment of auxiliary switches and span/offset
options, see the individual Technical Instructions.
See References.
Wiring
All wiring must conform to NEC and local codes and
regulations.
Use earth ground isolating step-down Class 2
transformers. Do not use autotransformers.
Determine the supply transformer rating by summing the
total VA of all actuators used. The maximum rating for a
Class 2 step-down transformer is 100 VA. The
recommended maximum actuators shown in Table 1
include a safety factor of 80% of the transformer VA.
Operating more actuators requires additional
transformers or separate 100 VA power trunks.
Table 1.
Actuator Power
Consumption
Actuators per
Class 2
Supply Circuit
Modulating Control
MEP-4556xx 9 VA 9
Two- and Three-position Control
MEP-4551xx
MEP-455500 8 VA 10
WARNING:
Mixed switch operation is not
permitted. To the switching outputs of
both auxiliary switches (A and B), only
apply:
• Standard cable (250 Vac/24 Vdc)
− UL/cUL: line voltage, or
− UL/cUL: Class 2 voltage.
NOTE: Either all six outputs of the
dual auxiliary switches must
be connected to line voltage or
all six outputs must be
connected to Class 2 voltage.
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