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31
positioned such that it is securely seated on this step. Tighten
the bolt to 15 ± 1 ft-lb (20 ± 1.3 N·m).
Step 6 — Configure Optional Motormaster
®
V
Controller —
The optional or acces
s
ory Motormaster V
controller uses a 0 to 5 vdc signal from a pressure transducer to
control the speed of the fans controlled by the Motormaster
control. The Motormaster V control is applied in 3 different ap-
plications on the 09DP product and must be configured for the
proper refrigerant application.
SINGLE CIRCUIT APPLICATIONS (09DPS018-030) —
One Motormaster control is used to control the speed of the
motor attached to the M
o
tormaster V control based on the sig-
nal from the liquid line transducer.
DUAL CIRCUIT APPLI
C
ATIONS (09DPM065-130)
—
There is one Motormaster control for each circuit and the speed
output of each Motormaster control
i
s controlled independently
by the liquid line transducer reading for each circuit.
SINGLE CIRCUIT APPLICATIONS (09DPM065-130) —
There are two Motormaster drives in the unit; one is the lead
Motormaster control and the other is the follower Motormaster
control. The units are shipped from the factory for independent
Motormaster control. This application requires modification to
the unit wiring during initial installation. This application MM-
A controls the speed of both MM-A and MM-B based on the
pressure transducer connected to MM-A.
Perform the following wiring modifications:
1. Remove the wiring to the Circuit B pressure transducer
connected to terminals 2, 5 and 6 on the terminal board
of the controller per Fig. 29.
2. The units are shipped with a package required for
modifying the unit for single circuit application. The
package is located in the bottom of the control box
below the Motormaster controllers.
3. Install the wire between MM-A terminal 2 and MM-B
terminal 2.
4. Install the wire with the resistor between MM-A termi-
nal 30 and MM-B terminal 25.
MOTORMASTER V REFRIGERANT CONFIGURA-
TION — The units are shipped from the factory for applica-
tion with R-410A refrigerant. When applying on R-134a sys-
tems, a jumper must be installed between terminal 2 and 12 of
MM-A and MM-B.
Once the controller is wired properly it is configured for the
application and no other adjustments are required. If the drive
does not function properly, the information in this book and in
Tables 12 and 13 can be used to troubleshoot.
IMPORTANT: Check for proper fan rotation (counter-
clockwise when viewed from above). If necessary, switch
any 2 power leads to reverse fan rotation.
CAUTION
If input power has not been applied to the drive for a period
of time exceeding three years (due to storage, etc.), the
electrolytic DC bus capacitors within the drive can change
internally, resulting in excessive leakage current. This can
result in premature failure of the capacitors if the drive is
operated after such a long period of inactivity or storage. In
order to reform the capacitors and prepare the drive for
operation after a long period of inactivity, apply input
power to the drive for 8 hours prior to actually operating
the motor. Before attempting to operate the drive, motor,
and driven equipment, be sure all procedures pertaining to
installation and wiring have been properly followed. Fail-
ure to comply could result in equipment damage.
Fig. 29 — Motormaster V Wiring (09DP115,130 Units Shown)
a09-604