VYPER
™
VARIABLE SPEED DRIVE
MAINTENANCE
100-210 IOM (
JUL
09)
Page 57
6. Carefully remove the Vyper
™
power module by sliding
it away from the bus structure while lifting slightly. The
bottom of the IGBT module will be wet. Ensure that the
coolant does not drip onto any other components inside
the Vyper enclosure. The coolant is conductive and
contact with the harmonic filter gate driver can cause a
failure.
7. Remove three (3) O-rings from the copper chill plate
and discard.
8. Wipe the chill plate clean with a clean, soft, cloth. DO
NOT clean using compressed air. DO NOT leave lint or
any other materials on the chill plate.
9. Lightly lubricate the new O-rings with O-ring lubricant
provided in the kit.
10. Install the new O-rings into the chill plate grooves.
11. Place the new Vyper
™
power module on the chill plate
so the connector is towards the front of the Vyper™
enclosure. Carefully slide the power module power con-
nections under the bus structure. DO NOT tighten. The
replacement assembly should still be loose.
12. Insert the eight (8) Allen head screws through the new
IGBT module and engage a few threads in the chill plate,
but DO NOT tighten. The new Vyper
™
power module
should still be loose.
13. Align the Vyper
™
power module so that the (6) Phillips
head screws can be installed through the bus struc-
ture and into the IGBT module. DO NOT tighten these
screws.
14. Tighten the Allen head screws to 48 in-lb (5.5 Nm) ±10%
in the numerical sequence shown in Figure 72.
15. Install the three (3) power wire connector tabs using (6)
Phillip head screws and torque the screws to 48 in-lb
(5.5 Nm) ±10%.
16. Remove the six (6) Phillips head screws (not yet tight-
ened) at the bus structure and install the three (3) square
capacitors to the bus structures with the these screws.
Torque the screws to 48 in-lb (5.5 Nm) ±10%.
Figure 72 - Power Module Screw Tightening Sequence
17. Close the drain valve on the heat exchanger and refill the
system with the coolant supplied and check for leaks.
18. Replace the running coolant using the procedure “Add-
ing and Replacing Coolant” portion of this manual. If the
system contained bacteria or corrosion, be sure to flush
the system with ethylene glycol first.
REPLACEMENT OF THE VYPER
™
HARMONIC FILTER POWER MODULE
The Vyper
™
Harmonic Filter Module
is to be replaced by Johnson
Controls certified service personnel
only. Death, severe personal injury, and/or equipment
damage may occur if service is not performed by
competent personnel.
Personnel not familiar with AC drive and proper electrical
safety guidelines should not be working on this product.
Power module replacement should be performed only by
Johnson Controls-certified technicians.
The harmonic filter module replacement procedure is the
same as the replacement for the Vyper
™
power module
except for the following:
•
Drain the coolant as described in the “Power Module
Replacement“ section, then remove one of the coolant
hoses feeding the Harmonic Filter Power Module.
•
Failure to completely drain the coolant system will
cause coolant to leak into the VSD cabinet and
possibly cause damage to other components inside
the cabinet.
